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enlarging a hole in steel
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fred
Oct 20, 2015, 6:18:08 AM10/20/15
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Occasionally I have to elongate by about 6mm an 8mm diam hole in 2-3mm thick mild steel. A round file would do it but none of my usual sites define the diameter of their round files. A stepped drill bit would just enlarge the hole which is not what I need. A power tool option would be nice. Any suggestions ?
The Natural Philosopher
Oct 20, 2015, 6:32:01 AM10/20/15
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On 20/10/15 11:18, fred wrote:
> Occasionally I have to elongate by about 6mm an 8mm diam hole in 2-3mm thick mild steel. A round file would do it but none of my usual sites define the diameter of their round files. A stepped drill bit would just enlarge the hole which is not what I need. A power tool option would be nice. Any suggestions ?
>
hand tool - a punch?
> Occasionally I have to elongate by about 6mm an 8mm diam hole in 2-3mm thick mild steel. A round file would do it but none of my usual sites define the diameter of their round files. A stepped drill bit would just enlarge the hole which is not what I need. A power tool option would be nice. Any suggestions ?
>
Or a nibbler?
--
Global warming is the new Margaret Thatcher. There is no ill in the
world it's not directly responsible for.
T i m
Oct 20, 2015, 8:39:26 AM10/20/15
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On Tue, 20 Oct 2015 03:18:06 -0700 (PDT), fred <tpmc...@gmail.com>
wrote:
>Occasionally I have to elongate by about 6mm an 8mm diam hole in 2-3mm thick mild steel. A round file would do it but none of my usual sites define the diameter of their round files. A stepped drill bit would just enlarge the hole which is not what I need. A power tool option would be nice. Any suggestions ?
I have a small set of what look at a glance like twist drill bits but
whilst they have a conventional hss bit to start with, the rest of the
bit is more a power file / burr / arbour.
http://www.axminster.co.uk/axminster-drill-saw-rasp-set
The best use is for drilling a hole in thinner / softer material and
then being able to open the hole up or take it in a slightly different
direction.
Because it is rotating, if you were trying to extend the hole in just
one direction (to turn it into your slot for example), you have to
make sure you are applying the side load in the right direction (which
may not be the obvious angle).
You might be able to make this work if you had the bit in a pillar
drill and pushed the job between guides?
Cheers, T i m
wrote:
>Occasionally I have to elongate by about 6mm an 8mm diam hole in 2-3mm thick mild steel. A round file would do it but none of my usual sites define the diameter of their round files. A stepped drill bit would just enlarge the hole which is not what I need. A power tool option would be nice. Any suggestions ?
whilst they have a conventional hss bit to start with, the rest of the
bit is more a power file / burr / arbour.
http://www.axminster.co.uk/axminster-drill-saw-rasp-set
The best use is for drilling a hole in thinner / softer material and
then being able to open the hole up or take it in a slightly different
direction.
Because it is rotating, if you were trying to extend the hole in just
one direction (to turn it into your slot for example), you have to
make sure you are applying the side load in the right direction (which
may not be the obvious angle).
You might be able to make this work if you had the bit in a pillar
drill and pushed the job between guides?
Cheers, T i m
fred
Oct 20, 2015, 9:32:54 AM10/20/15
to
But thanks for the suggestion any way.
Axminster no longer put an email address for technical queries on their site. When I used an old email address for this query I had it was ignored.
fred
Oct 20, 2015, 9:34:47 AM10/20/15
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Dave Baker
Oct 20, 2015, 10:02:18 AM10/20/15
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carbide
burr. Ideally used in professional cylinder head porting equipment at
up to 15,000 rpm like mine but they'll do quite nicely in an ordinary
drill albeit taking a bit longer.
http://www.master-abrasives.co.uk/products/overview/master-surface-finishing/rotary-burrs-and-cutting-tools/tungsten-carbide-burrs.aspx
Part number C081906 in the pdf would suit.
--
Dave Baker
F Murtz
Oct 20, 2015, 10:57:27 AM10/20/15
to
fred wrote:
> Occasionally I have to elongate by about 6mm an 8mm diam hole in 2-3mm thick mild steel. A round file would do it but none of my usual sites define the diameter of their round files. A stepped drill bit would just enlarge the hole which is not what I need. A power tool option would be nice. Any suggestions ?
>
Die grinder,(like a potent dremmel)with a carbide cutter (burr)
> Occasionally I have to elongate by about 6mm an 8mm diam hole in 2-3mm thick mild steel. A round file would do it but none of my usual sites define the diameter of their round files. A stepped drill bit would just enlarge the hole which is not what I need. A power tool option would be nice. Any suggestions ?
>
http://www.ebay.com.au/bhp/carbide-burr
Muddymike
Oct 20, 2015, 10:59:12 AM10/20/15
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are very good at creating odd shaped holes in steel.
This is one of them
https://dl.dropboxusercontent.com/u/49024805/Burr.jpg
Mike
Chris J Dixon
Oct 20, 2015, 11:42:48 AM10/20/15
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might not be up to taking the side loading if this was done too
often?
Chris
--
Chris J Dixon Nottingham UK
ch...@cdixon.me.uk
Plant amazing Acers.
Dave Plowman (News)
Oct 20, 2015, 11:59:17 AM10/20/15
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In article <56265654$0$28023$b1db1813$2411...@news.astraweb.com>,
My feeling is that with relatively thin steel I'd file it out by hand
before you've found the chuck key for a power tool. And hand held cutters
in thin steel have a habit of wandering all over the place.
But I am assuming you have a decent vice that it can be clamped in.
--
*Why do overlook and oversee mean opposite things? *
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
before you've found the chuck key for a power tool. And hand held cutters
in thin steel have a habit of wandering all over the place.
But I am assuming you have a decent vice that it can be clamped in.
--
*Why do overlook and oversee mean opposite things? *
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
Robin
Oct 20, 2015, 2:27:20 PM10/20/15
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Chris J Dixon wrote:
> Isn't there some risk that the bearings in an ordinary drill
> might not be up to taking the side loading if this was done too
> often?
>
OTOH an angle grinder with an 8mm tungsten carbide mortar rake....
> Isn't there some risk that the bearings in an ordinary drill
> might not be up to taking the side loading if this was done too
> often?
>
--
Robin
reply to address is (meant to be) valid
fred
Oct 21, 2015, 7:50:56 AM10/21/15
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No vice. This is to resolve a problem with two components not aligning correctly when being assembled at the customers premises. Normally its only 2-3mm, or less, astray, but recently it was more like 8mm. Hard to force that much into alignment with a big boot.
newshound
Oct 21, 2015, 1:25:44 PM10/21/15
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only have normal drill speeds.
In my experience, one problem with trying to make slots using "drills
with side-cutting teeth" is cutting in the direction you want to go,
because the rotating tool deflects you sideways. Not an issue with
Dave's high speed cutters for two reasons, first the power tool is
designed to be easy to hold and stabilise, second at very high speed you
need little applied force, so the sideways force is small compared to
the mass of the tool and they are therefore easier to keep "on track".
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