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why do hacksaws cut on the pull?

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RobertL

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May 20, 2015, 6:40:09 AM5/20/15
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AIUI the convention with a hacksaw is to put the blade in so it cuts as you pull the saw upwards. This is the opposite to, say, a tenon saw where the cut is done on the down stroke.

I've often wondered: is there a special reason for this difference?

Robert

Tricky Dicky

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May 20, 2015, 7:09:18 AM5/20/15
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Sorry to disagree, the terms are forward and backstroke and the blade should be inserted to cut on the forward stroke. Some people put the blade of a junior hacksaw in reverse, especially the cheap bent metal bar type as it keeps it in tension better. Your reference to upstroke and downstrokes makes me think you are confusing hacksaws with piercing saws and fret saws, both of these have the blades reversed when used in conjunction with a "jewellers vice" which is normally a piece of wood attached to and overhanging a bench edge with a Vee cut into it.

Richard

RobertL

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May 20, 2015, 7:21:48 AM5/20/15
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On Wednesday, May 20, 2015 at 12:09:18 PM UTC+1, Tricky Dicky wrote:
> Sorry to disagree, the terms are forward and backstroke and the blade should be inserted to cut on the forward stroke. Some people put the blade of a junior hacksaw in reverse, especially the cheap bent metal bar type as it keeps it in tension better. Your reference to upstroke and downstrokes makes me think you are confusing hacksaws with piercing saws and fret saws, both of these have the blades reversed when used in conjunction with a "jewellers vice" which is normally a piece of wood attached to and overhanging a bench edge with a Vee cut into it.
>
> Richard



Aha, thank you. Somehow I had it into my head (from childhood) that the hacksaw blade was the other way. I'll go and change it round and stop being puzzled.

Robert

michael adams

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May 20, 2015, 7:38:11 AM5/20/15
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"RobertL" <rober...@yahoo.com> wrote in message
news:f9986d86-17db-4d78...@googlegroups.com...


> Aha, thank you. Somehow I had it into my head (from childhood) that the
> hacksaw blade was the other way. I'll go and change it round and stop
> being puzzled.

> Robert

...

Most saws cut on the push stroke because that way its easier
to generate power and align the saw on the correct path
as you're looking in that direction.


Japanese wood saws on the other hand all cut on the back stroke,
the only advantage being that the blades can be made much thinner
and so cut a narrower kerf. There was a vogue for Japanese
hand tools a while back. They cost three or four times
the cost of their western equivalents although whether this
was just a coincidence or not, is not for me to say.

Although hacksaw and bowsaw blades are relatively thin because
they're held in tension in frames, they don't buckle when pushed
as they otherwise would do.


michael adams

...



John Rumm

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May 20, 2015, 7:56:26 AM5/20/15
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Generally they are usually set to cut on the push, but some people
prefer them with the blade reversed. The pad saw type (with a length of
unsupported blade poking out the end), may benefit from having the blade
cutting on the pull since it makes it less likely you will bend the end.


--
Cheers,

John.

/=================================================================\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/

Bill Wright

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May 20, 2015, 8:42:31 AM5/20/15
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Odd how some things stick in your memory. When I was 12, 13, 14, 15 I
used to help my dad fix TV aerials. One day while he was in the shop
collecting the aerials I decided to replace the blade in the junior
hacksaw in my pocket. I did it the wrong way round but wasn't sure, and
when dad re-appeared he put me right.

Why do I remember that 50 years later?

Bill

Bill Wright

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May 20, 2015, 8:44:17 AM5/20/15
to
John Rumm wrote:
> On 20/05/2015 11:40, RobertL wrote:
>>
>> AIUI the convention with a hacksaw is to put the blade in so it cuts
>> as you pull the saw upwards. This is the opposite to, say, a tenon
>> saw where the cut is done on the down stroke.
>>
>> I've often wondered: is there a special reason for this difference?
>
> Generally they are usually set to cut on the push, but some people
> prefer them with the blade reversed. The pad saw type (with a length of
> unsupported blade poking out the end), may benefit from having the blade
> cutting on the pull since it makes it less likely you will bend the end.
>
>
Some blades have symmetrical teeth so they cut, inefficiently, on both
push and pull.

Bill

tabb...@gmail.com

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May 20, 2015, 8:58:41 AM5/20/15
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On Wednesday, 20 May 2015 12:38:11 UTC+1, michael adams wrote:
> "RobertL" <rober...@yahoo.com> wrote in message
> news:f9986d86-17db-4d78...@googlegroups.com...
>
>
> > Aha, thank you. Somehow I had it into my head (from childhood) that the
> > hacksaw blade was the other way. I'll go and change it round and stop
> > being puzzled.
>
> > Robert
>
> ...
>
> Most saws cut on the push stroke because that way its easier
> to generate power and align the saw on the correct path
> as you're looking in that direction.
>
>
> Japanese wood saws on the other hand all cut on the back stroke,
> the only advantage being that the blades can be made much thinner
> and so cut a narrower kerf. There was a vogue for Japanese
> hand tools a while back. They cost three or four times
> the cost of their western equivalents although whether this
> was just a coincidence or not, is not for me to say.

the advantage of a thin kerf is much less total energy used to do the job.


NT

F Murtz

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May 20, 2015, 9:18:06 AM5/20/15
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Has any one seen progressive hacksaw blades?they start off with fine
teeth then get coarser toward the back, they are still available but
rare and fairly expensive ?

Nightjar .me.uk>

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May 20, 2015, 10:16:20 AM5/20/15
to
On 20/05/2015 13:42, Bill Wright wrote:
...
> Odd how some things stick in your memory. When I was 12, 13, 14, 15 I
> used to help my dad fix TV aerials. One day while he was in the shop
> collecting the aerials I decided to replace the blade in the junior
> hacksaw in my pocket. I did it the wrong way round but wasn't sure, and
> when dad re-appeared he put me right.
>
> Why do I remember that 50 years later?

Memory reinforced by the traditional clip around the ear?


--
Colin Bignell

TomSawer

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May 20, 2015, 11:02:12 AM5/20/15
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On 20/05/2015 11:40, RobertL wrote:
>
This not what I was taught!

dennis@home

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May 20, 2015, 11:36:49 AM5/20/15
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On 20/05/2015 11:40, RobertL wrote:
>
Yes, you have put the blade in backwards.

Tim Lamb

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May 20, 2015, 1:51:11 PM5/20/15
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In message <hZ-dnRFLhqevCsHI...@giganews.com>, Nightjar
<cpb@?.me.uk.invalid> writes
Cutting thin tube might be best on the back stroke.

AFAIK workshop reciprocating saws are set up this way. Well, mine is:-)
The mechanism reduces the blade pressure on the out stroke with a fancy
flutter valve immersed in oil gismo.
>
>

--
Tim Lamb

dennis@home

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May 20, 2015, 2:43:14 PM5/20/15
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On 20/05/2015 18:47, Tim Lamb wrote:

> AFAIK workshop reciprocating saws are set up this way. Well, mine is:-)
> The mechanism reduces the blade pressure on the out stroke with a fancy
> flutter valve immersed in oil gismo.
>>
>>
>

Don't most workshop saws have a quick return stroke so you want to cut
on the slow stroke which is usually to the fixed vice jaw at the rear.

Rod Speed

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May 20, 2015, 3:42:22 PM5/20/15
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"Bill Wright" <bi...@invalid.com> wrote in message
news:mjhvfi$nk$2...@speranza.aioe.org...
Likely because it was one of the more memorable
things that happened at that time.

When I was a little kid, preschool or close, what used to
be called my maiden aunt came for a visit in some stinking
hot weather and I can still remember being shocked that
she would drink tea in that situation and what the adults
said was the reason for doing that.

Brian-Gaff

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May 20, 2015, 3:49:43 PM5/20/15
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I've used it both ways around, depending on the job, so I'd argue that
cutting on the pull is standard, cos there aint no standard. the place
needing to be cut and the ergonomics of the situation dictate what you do
quite often.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"RobertL" <rober...@yahoo.com> wrote in message
news:faa92f46-f63c-479b...@googlegroups.com...

Tim Lamb

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May 21, 2015, 4:16:50 AM5/21/15
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In message <555cd5c0$0$10061$b1db1813$ba2d...@news.astraweb.com>,
"dennis@home" <den...@nowhere.invalid> writes
Mine is a simple crank drive. The front jaw is the fixed one. Likely to
be even older than the user:-)

--
Tim Lamb

Nightjar .me.uk>

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May 21, 2015, 10:52:59 AM5/21/15
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On 20/05/2015 18:47, Tim Lamb wrote:
No idea. I always used a horizontal band saw.


--
Colin Bignell

Graham.

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May 21, 2015, 6:15:27 PM5/21/15
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On Wed, 20 May 2015 13:42:25 +0100, Bill Wright <bi...@invalid.com>
wrote:
When I was about 8 or 9 my dad bought me a junior hacksaw from Mr
Saul's hardware shop across the road.
A very memorable occasion. Almost a rite of passage. I had a very
sheltered upbringing.

--

Graham.

%Profound_observation%

Tim Lamb

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May 22, 2015, 3:46:34 AM5/22/15
to
In message <4olsla1jb7ond7392...@4ax.com>, Graham.
<m...@privicy.net> writes
>
>When I was about 8 or 9 my dad bought me a junior hacksaw from Mr
>Saul's hardware shop across the road.
>A very memorable occasion. Almost a rite of passage. I had a very
>sheltered upbringing.

Me too! Although I don't remember the source.

We were holidaying in Felixtowe and I was desperate to get home and try
out my saw:-)
>

--
Tim Lamb

Todd Gack

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Jun 18, 2023, 9:45:16 PM6/18/23
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Tension. When cutting on the pull the blade is always pulling against the stable handle, not the tension end of the saw which is flexible, and so the blade is always rigid.

jon

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Jun 19, 2023, 2:41:13 AM6/19/23
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Because the blade has been fitted incorrectly.

The Natural Philosopher

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Jun 19, 2023, 3:50:22 AM6/19/23
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No, hacksaws are designed to cut on the pull.

--
"I guess a rattlesnake ain't risponsible fer bein' a rattlesnake, but ah
puts mah heel on um jess the same if'n I catches him around mah chillun".


Brian Gaff

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Jun 19, 2023, 4:47:17 AM6/19/23
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Well, I've tried the blade both ways, and prefer it to cut on the push
myself. the pull then cleans out the debris.

I usually break the blade if I set it to cut on the pull, since the rigid
handle, I assume is not so forgiving as the other end and twang, it breaks.
Maybe I'm just an awkward sod.
Brian

--

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"Todd Gack" <todd.g...@gmail.com> wrote in message
news:c7b546b1-51c7-4360...@googlegroups.com...

Brian Gaff

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Jun 19, 2023, 4:53:52 AM6/19/23
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Well some of the more flimsy junior hacksaws can work better if you fit the
blade so they cut on the pull, as the springyness of the other side can mean
that if it snags, the blade breaks or falls out.
Often, also it much depends on what you are cutting and access, but the
fact still remains that cutting on the down stroke gives more force to the
cut to keep it in the slot.
Brian

--

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"The Natural Philosopher" <t...@invalid.invalid> wrote in message
news:u6p1bp$20r6o$7...@dont-email.me...
> On 19/06/2023 07:41, jon wrote:
>> On Sun, 18 Jun 2023 18:45:14 -0700, Todd Gack wrote:
>>

wasbit

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Jun 19, 2023, 5:35:53 AM6/19/23
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On 19/06/2023 07:41, jon wrote:
Don't see the OP so replied here.

Pushing a blade puts it in compression & it may buckle.
Pulling a blade puts it under tension - easier on the muscles.

--
Regards
wasbit

Clive Arthur

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Jun 19, 2023, 5:51:43 AM6/19/23
to
On 19/06/2023 08:50, The Natural Philosopher wrote:
> On 19/06/2023 07:41, jon wrote:
>> On Sun, 18 Jun 2023 18:45:14 -0700, Todd Gack wrote:
>>
>>> On Wednesday, May 20, 2015 at 8:10:09 PM UTC+9:30, RobertL wrote:
>>>> AIUI the convention with a hacksaw is to put the blade in so it cuts as
>>>> you pull the saw upwards. This is the opposite to, say, a tenon saw
>>>> where the cut is done on the down stroke.
>>>>
>>>> I've often wondered: is there a special reason for this difference?
>>>>
>>>> Robert
>>>
>>> Tension. When cutting on the pull the blade is always pulling against
>>> the stable handle, not the tension end of the saw which is flexible,
>>> and so the blade is always rigid.
>>
>> Because the blade has been fitted incorrectly.
> No, hacksaws are designed to cut on the pull.
>
That surprises me. I can see there might be occasions when you'd want
to cut on the pull, but I was taught that the teeth should point
forwards, and Googling "What is the correct direction for a hacksaw
blade?" supports this view.

--
Cheers
Clive

Fredxx

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Jun 19, 2023, 6:19:28 AM6/19/23
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On 19/06/2023 08:50, The Natural Philosopher wrote:
> On 19/06/2023 07:41, jon wrote:
>> On Sun, 18 Jun 2023 18:45:14 -0700, Todd Gack wrote:
>>
>>> On Wednesday, May 20, 2015 at 8:10:09 PM UTC+9:30, RobertL wrote:
>>>> AIUI the convention with a hacksaw is to put the blade in so it cuts as
>>>> you pull the saw upwards. This is the opposite to, say, a tenon saw
>>>> where the cut is done on the down stroke.
>>>>
>>>> I've often wondered: is there a special reason for this difference?
>>>>
>>>> Robert
>>>
>>> Tension. When cutting on the pull the blade is always pulling against
>>> the stable handle, not the tension end of the saw which is flexible,
>>> and so the blade is always rigid.
>>
>> Because the blade has been fitted incorrectly.
> No, hacksaws are designed to cut on the pull.

Not the ones I have. They are generally designed with the blade oriented
to cut on the push. The idea is that there is an additional downwards
force on the blade from the angle of the 'push'. It is common to start a
cut by 'pulling' for a few cuts to make a slot to minimise wander on
forward cuts.

The only articles I have seen where cutting on the pull is done is for
soft materials.

Perhaps you just cut soft materials like an art student?


SteveW

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Jun 19, 2023, 8:46:12 AM6/19/23
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While that is correct, hacksaws are meant to cut on the push (where the
push helps keep it down and cutting), with the blade pre-tensioned to
prevent it buckling.

Fredxx

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Jun 19, 2023, 9:49:48 AM6/19/23
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On 19/06/2023 10:35, wasbit wrote:
That is down to the rigidity and quality of the saw frame.

> Pulling a blade puts it under tension - easier on the muscles.

Interesting, I find the opposite, though I might have more control over
a pull.


Rob H

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Jun 19, 2023, 1:50:46 PM6/19/23
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On 19/06/2023 07:41, jon wrote:
Well I must have fitted them the wrong way round for the 45 years I used
them

jon

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Jun 19, 2023, 2:10:55 PM6/19/23
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I have been using them with the leading blade edge forward for 65 years,
since my apprenticeship.

Rod Speed

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Jun 19, 2023, 3:23:35 PM6/19/23
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On Mon, 19 Jun 2023 17:50:17 +1000, The Natural Philosopher
<t...@invalid.invalid> wrote:

> On 19/06/2023 07:41, jon wrote:
>> On Sun, 18 Jun 2023 18:45:14 -0700, Todd Gack wrote:
>>
>>> On Wednesday, May 20, 2015 at 8:10:09 PM UTC+9:30, RobertL wrote:
>>>> AIUI the convention with a hacksaw is to put the blade in so it cuts
>>>> as
>>>> you pull the saw upwards. This is the opposite to, say, a tenon saw
>>>> where the cut is done on the down stroke.
>>>>
>>>> I've often wondered: is there a special reason for this difference?
>>>>
>>>> Robert
>>>
>>> Tension. When cutting on the pull the blade is always pulling against
>>> the stable handle, not the tension end of the saw which is flexible,
>>> and so the blade is always rigid.
>> Because the blade has been fitted incorrectly.

> No, hacksaws are designed to cut on the pull.

BULLSHIT

Rod Speed

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Jun 19, 2023, 3:32:48 PM6/19/23
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Brian Gaff <brian...@gmail.com> wrote

> Well, I've tried the blade both ways,

I havent bothered.

> and prefer it to cut on the push myself.

Me too, essentially because you can apply more force in the push mode.

The obvious exception is with a power hacksaw on a hand held drill etc
but you dont have any choice on which way the blade goes in that case.

Rod Speed

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Jun 19, 2023, 3:35:01 PM6/19/23
to
Brian Gaff <brian...@gmail.com> wrote

> Well some of the more flimsy junior hacksaws

Never bother with flimsy ones myself.

> can work better if you fit the
> blade so they cut on the pull, as the springyness of the other side can
> mean
> that if it snags, the blade breaks or falls out.

> Often, also it much depends on what you are cutting and access, but the
> fact still remains that cutting on the down stroke gives more force to
> the
> cut to keep it in the slot.

Yep

Rod Speed

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Jun 19, 2023, 3:46:34 PM6/19/23
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On Mon, 19 Jun 2023 19:51:39 +1000, Clive Arthur <noway...@noway.uk>
wrote:
Yep, the turnip doesnt have a clue.

Peeler

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Peeler

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Peeler

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Peeler

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The Natural Philosopher

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Jun 19, 2023, 5:57:52 PM6/19/23
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When I were a prentice learning how to work metal, that is what we were
taught. \Google gets an opinion, not fact

--
“The fundamental cause of the trouble in the modern world today is that
the stupid are cocksure while the intelligent are full of doubt."

- Bertrand Russell


The Natural Philosopher

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Jun 19, 2023, 5:58:19 PM6/19/23
to
Nope. steel rod mainly

The Natural Philosopher

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Jun 19, 2023, 6:01:14 PM6/19/23
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When I bought them, the blade was always fitted to cut on the pull

SteveW

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Jun 19, 2023, 6:07:26 PM6/19/23
to
On 19/06/2023 22:57, The Natural Philosopher wrote:
> On 19/06/2023 10:51, Clive Arthur wrote:
>> On 19/06/2023 08:50, The Natural Philosopher wrote:
>>> On 19/06/2023 07:41, jon wrote:
>>>> On Sun, 18 Jun 2023 18:45:14 -0700, Todd Gack wrote:
>>>>
>>>>> On Wednesday, May 20, 2015 at 8:10:09 PM UTC+9:30, RobertL wrote:
>>>>>> AIUI the convention with a hacksaw is to put the blade in so it
>>>>>> cuts as
>>>>>> you pull the saw upwards. This is the opposite to, say, a tenon saw
>>>>>> where the cut is done on the down stroke.
>>>>>>
>>>>>> I've often wondered: is there a special reason for this difference?
>>>>>>
>>>>>> Robert
>>>>>
>>>>> Tension. When cutting on the pull the blade is always pulling against
>>>>> the stable handle, not the tension end of the saw which is flexible,
>>>>> and so the blade is always rigid.
>>>>
>>>> Because the blade has been fitted incorrectly.
>>> No, hacksaws are designed to cut on the pull.
>>>
>> That surprises me.  I can see there might be occasions when you'd want
>> to cut on the pull, but I was taught that the teeth should point
>> forwards, and Googling "What is the correct direction for a hacksaw
>> blade?" supports this view.
>>
> When I were a prentice learning how to work metal, that is what we were
> taught. \Google gets an opinion, not  fact

Push cut was also what I was taught in the '80s.

NY

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Jun 19, 2023, 6:21:11 PM6/19/23
to
I have found that if I fit a hacksaw blade so it cuts on the push, the
blade tends to bow between the handle and the work that you are cutting,
whereas if you fit it to cut on the pull, it remains rigid. I presume
this is because the frame is a bit flexible so if you cut on the push,
the handle end of the frame distorts towards the tension end and the
blade is no longer in tension.

A short hacksaw, with a frame which is thick (and therefore stiff)
relative to the distance between the handle and tension ends, has less
of a problem than a much longer hacksaw.

If you are cutting wood or fairly thick metal, the teeth are less likely
to bind. If you are cutting thin metal sheet which is of a similar
thickness to the pitch of the teeth, the teeth are more likely to bind
and cause a cut-on-the-push blade to buckle because of insufficient tension.

SteveW

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Jun 19, 2023, 7:24:43 PM6/19/23
to
On 19/06/2023 23:01, The Natural Philosopher wrote:
> On 19/06/2023 18:50, Rob H wrote:
>> On 19/06/2023 07:41, jon wrote:
>>> On Sun, 18 Jun 2023 18:45:14 -0700, Todd Gack wrote:
>>>
>>>> On Wednesday, May 20, 2015 at 8:10:09 PM UTC+9:30, RobertL wrote:
>>>>> AIUI the convention with a hacksaw is to put the blade in so it
>>>>> cuts as
>>>>> you pull the saw upwards. This is the opposite to, say, a tenon saw
>>>>> where the cut is done on the down stroke.
>>>>>
>>>>> I've often wondered: is there a special reason for this difference?
>>>>>
>>>>> Robert
>>>>
>>>> Tension. When cutting on the pull the blade is always pulling against
>>>> the stable handle, not the tension end of the saw which is flexible,
>>>> and so the blade is always rigid.
>>>
>>> Because the blade has been fitted incorrectly.
>>
>> Well I must have fitted them the wrong way round for the 45 years I
>> used them
> When I bought them, the blade was always fitted to cut on the pull

Mine have always been on the push.

I've just taken a look at RS, with them being a supplier to industry,
and they say push.

https://uk.rs-online.com/web/content/discovery/ideas-and-advice/hacksaws-guide

Where they say, "Ensure the blade is mounted in the correct direction,
facing forwards" and "Hacksaw blades should be mounted in their frames
with the teeth facing forwards. They are designed so that the blade will
cut on the push – the forward stroke – rather than the pull, or
backwards stroke."

Tim+

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Jun 20, 2023, 3:26:07 AM6/20/23
to
I reckon that if the king of hacksawing motorbike engines pushes his
blades, that’s probably the best way. Allen Millyard has done some quite
extraordinary engine builds in his shed.

Just as an example (about 3 minutes in).

https://youtu.be/GhrLg6mZQIo

Tim

--
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Vir Campestris

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Jun 20, 2023, 7:08:38 AM6/20/23
to
On 19/06/2023 10:35, wasbit wrote:
> Don't see the OP so replied here.
>
> Pushing a blade puts it in compression & it may buckle.
> Pulling a blade puts it under tension - easier on the muscles.

A hacksaw typically supports the blade from both ends. Whether the blade
is being pulled from the handle end (a pull cut) or from the other end
(a push cut) should make no difference to the blade, only the ease you
have in cutting.

Unless of course your hacksaw is really flexible. In that case it may
fail to keep the blade in tension on a push cut.

Andy

Paul

unread,
Jun 20, 2023, 8:32:31 AM6/20/23
to
On 6/18/2023 9:45 PM, Todd Gack wrote:
> On Wednesday, May 20, 2015 at 8:10:09 PM UTC+9:30, RobertL wrote:
>> AIUI the convention with a hacksaw is to put the blade in so it cuts as you pull the saw upwards. This is the opposite to, say, a tenon saw where the cut is done on the down stroke.
>>
>> I've often wondered: is there a special reason for this difference?
>>
>> Robert
>
> Tension. When cutting on the pull the blade is always pulling against the stable handle, not the tension end of the saw which is flexible, and so the blade is always rigid.
>

https://au.rs-online.com/web/content/discovery/ideas-and-advice/hacksaws-guide

"Does a Hacksaw Cut on the Push or the Pull?

Hacksaw blades should be mounted in their frames with the teeth facing forwards.
They are designed so that the blade will cut on the push – the forward stroke –
rather than the pull, or backwards stroke. The correct orientation for mounting
will sometimes be indicated by an arrow marked on the blade.
"

And that's for a fully supported hacksaw blade. A mini-hacksaw, use your
own judgment, after ruining a blade :-)

It's hard to get a picture showing the tooth profile, but the cutting
edge is closer to vertical, while the trailing edge has more of a slope.
The teeth can also be staggered from side to side.

https://cdn.shopify.com/s/files/1/0629/5591/3395/products/91ecWx04MtL._AC_SL1500.jpg?v=1665820762&width=1445

/
/______
\------
\ Cut on push, shape of favourite brand

--------+ +-----
| /
| /
|/

Home photography version (arrow towards right is push direction):

https://i.postimg.cc/rFzmG9SW/hacksaw-blade.jpg

It's a good thing I have some 18T blades that I don't normally use,
for photographs like this. The 32T that stays in the hacksaw,
would be very hard to photograph.

The coating on a new blade, can obscure tooth shape.

Paul

Brian Gaff

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Jun 20, 2023, 10:13:55 AM6/20/23
to
No the same way on the push should normally be used. This thread is the
first I've heard of cutting on the pull, Odd things you may find work better
especially if you cannot get the handle and you hand in, but generally is
push like all saws except for electric jig saws some of which have blades
made to cut both ways.
Brian

--

--:
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...
bri...@blueyonder.co.uk
Blind user, so no pictures please
Note this Signature is meaningless.!
"Paul" <nos...@needed.invalid> wrote in message
news:u6s68o$2ema4$1...@dont-email.me...
> On 6/18/2023 9:45 PM, Todd Gack wrote:
>> On Wednesday, May 20, 2015 at 8:10:09?PM UTC+9:30, RobertL wrote:
>>> AIUI the convention with a hacksaw is to put the blade in so it cuts as
>>> you pull the saw upwards. This is the opposite to, say, a tenon saw
>>> where the cut is done on the down stroke.
>>>
>>> I've often wondered: is there a special reason for this difference?
>>>
>>> Robert
>>
>> Tension. When cutting on the pull the blade is always pulling against the
>> stable handle, not the tension end of the saw which is flexible, and so
>> the blade is always rigid.
>>
>
> https://au.rs-online.com/web/content/discovery/ideas-and-advice/hacksaws-guide
>
> "Does a Hacksaw Cut on the Push or the Pull?
>
> Hacksaw blades should be mounted in their frames with the teeth facing
> forwards.
> They are designed so that the blade will cut on the push - the forward
> stroke -

PeterC

unread,
Jun 20, 2023, 12:52:41 PM6/20/23
to
The one use of pull with a hacksaw (or any other) blade is with a padsaw.
I've a couple of pull saws from Aldidl; the samall one is a pad saw and the
big one is vary good for v. narrow cuts.
Always takes a while to get used to them - and the teeth are bloody vicious!
--
Peter.
The gods will stay away
whilst religions hold sway

NY

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Jun 20, 2023, 3:59:28 PM6/20/23
to
"PeterC" <giraffe...@homecall.co.uk> wrote in message
news:1i1972lpj9qhy$.1wfa4cqg47tt8$.dlg@40tude.net...
> On Tue, 20 Jun 2023 12:08:33 +0100, Vir Campestris wrote:
>
>> On 19/06/2023 10:35, wasbit wrote:
>>> Don't see the OP so replied here.
>>>
>>> Pushing a blade puts it in compression & it may buckle.
>>> Pulling a blade puts it under tension - easier on the muscles.
>>
>> A hacksaw typically supports the blade from both ends. Whether the blade
>> is being pulled from the handle end (a pull cut) or from the other end
>> (a push cut) should make no difference to the blade, only the ease you
>> have in cutting.
>>
>> Unless of course your hacksaw is really flexible. In that case it may
>> fail to keep the blade in tension on a push cut.
>>
>> Andy
>
> The one use of pull with a hacksaw (or any other) blade is with a padsaw.
> I've a couple of pull saws from Aldidl; the small one is a pad saw and the
> big one is vary good for v. narrow cuts.
> Always takes a while to get used to them - and the teeth are bloody
> vicious!


So if you have a hacksaw (*) with a push blade, and you've tightened the
tensioning mechanism as tight as you can, but the blade still buckles and
bends (sometimes irreversibly) immediately on the handle side of the work
being cut, what can be done to rectify the problem? I've found that this has
happened with most hacksaws that I've used, and I've resorted to reversing
the blade so it cuts on the pull stroke which causes the problem to
disappear. It's worst when cutting very thin metal sheet which is a similar
thickness to the spacing of the teeth, because that often causes the teeth
to bind in the metal and the blade buckles before you have had chance to
stop pushing it forwards.


(*) Either a junior hacksaw with a fixed frame or a full-size hacksaw with a
frame in two halves which can be set to lock at various lengths to
accommodate different blades.

Tim Lamb

unread,
Jun 20, 2023, 4:53:32 PM6/20/23
to
In message <u6t0es$2hasr$1...@dont-email.me>, NY <m...@privacy.invalid>
writes
My apprentice supervisor told us you must always have 3 teeth in contact
with the work. (similar rule for files)

Not a huge choice with Junior hacksaw blades but 12" come in a range of
tooth spacing.
>
>
>(*) Either a junior hacksaw with a fixed frame or a full-size hacksaw
>with a frame in two halves which can be set to lock at various lengths
>to accommodate different blades.

--
Tim Lamb

The Natural Philosopher

unread,
Jun 21, 2023, 1:38:31 AM6/21/23
to
Junior hacksaws are flexible

--
It is the folly of too many to mistake the echo of a London coffee-house
for the voice of the kingdom.

Jonathan Swift


Tim Lamb

unread,
Jun 21, 2023, 4:06:57 AM6/21/23
to
In message <u6u2ci$2okgp$8...@dont-email.me>, The Natural Philosopher
<t...@invalid.invalid> writes
>On 20/06/2023 12:08, Vir Campestris wrote:
>> On 19/06/2023 10:35, wasbit wrote:
>>> Don't see the OP so replied here.
>>>
>>> Pushing a blade puts it in compression & it may buckle.
>>> Pulling a blade puts it under tension - easier on the muscles.
>> A hacksaw typically supports the blade from both ends. Whether the
>>blade is being pulled from the handle end (a pull cut) or from the
>>other end (a push cut) should make no difference to the blade, only
>>the ease you have in cutting.
>> Unless of course your hacksaw is really flexible. In that case it
>>may fail to keep the blade in tension on a push cut.
>> Andy
>Junior hacksaws are flexible

:-) I was given one while on holiday in Felixtowe, around 1951. Spoiled
my holiday as I was keen to get home and put it to use!
>

--
Tim Lamb

Rod Speed

unread,
Jun 21, 2023, 4:57:40 AM6/21/23
to
On Wed, 21 Jun 2023 15:38:26 +1000, The Natural Philosopher
<t...@invalid.invalid> wrote:

> On 20/06/2023 12:08, Vir Campestris wrote:
>> On 19/06/2023 10:35, wasbit wrote:
>>> Don't see the OP so replied here.
>>>
>>> Pushing a blade puts it in compression & it may buckle.
>>> Pulling a blade puts it under tension - easier on the muscles.
>> A hacksaw typically supports the blade from both ends. Whether the
>> blade is being pulled from the handle end (a pull cut) or from the
>> other end (a push cut) should make no difference to the blade, only the
>> ease you have in cutting.
>> Unless of course your hacksaw is really flexible. In that case it may
>> fail to keep the blade in tension on a push cut.

> Junior hacksaws are flexible

Mine isnt and works fine with the blade in push mode.

Peeler

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Jun 21, 2023, 11:22:47 AM6/21/23
to
On Wed, 21 Jun 2023 18:57:32 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

<FLUSH the abnormal trolling senile cretin's latest trollshit unread>

--
Tim+ about trolling Rodent Speed:
He is by far the most persistent troll who seems to be able to get under the
skin of folk who really should know better. Since when did arguing with a
troll ever achieve anything (beyond giving the troll pleasure)?
MID: <1421057667.659518815.743...@news.individual.net>

PeterC

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Jun 21, 2023, 1:03:17 PM6/21/23
to
On Tue, 20 Jun 2023 20:59:17 +0100, NY wrote:

> So if you have a hacksaw (*) with a push blade, and you've tightened the
> tensioning mechanism as tight as you can, but the blade still buckles and
> bends (sometimes irreversibly) immediately on the handle side of the work
> being cut, what can be done to rectify the problem?

I've never had a 12" blade buckle like that. Bear in mind that if the
tension is high enough (higher than the resistance load applied on the
forward stroke) then the blade is always pulled.
I was taught that the blade should be slackened off after use. This was in
the days before the hardened points, when the whole blade was hard. I don't
know if it helped at all, but I still do it.

Vir Campestris

unread,
Jun 22, 2023, 4:44:28 PM6/22/23
to
On 20/06/2023 20:59, NY wrote:
> So if you have a hacksaw (*) with a push blade, and you've tightened the
> tensioning mechanism as tight as you can, but the blade still buckles
> and bends (sometimes irreversibly) immediately on the handle side of the
> work being cut, what can be done to rectify the problem?

<snip>

Buy a better hacksaw. Or maybe you are pressing _REALLY_ hard. I've had
no problems.

Andy
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