Diamond core drill - this is getting ridiculous - which brand?

[David]

I'm almost through my first brick but my rate of progress seems to have
almost stalled. I am now wondering if this sodding extra hard brick has
worn down the diamond core.

I have
https://www.toolstation.com/shop/p47481
at £25.

Other options are:

https://www.toolstation.com/shop/p37363
also from Mexco at £33.32


https://www.screwfix.com/p/erbauer-diamond-core-drill-bit-52mm/49650
at £26.49

https://www.screwfix.com/p/marcrist-diamond-core-drill-bit-52mm/2806f
at £38.99

https://www.screwfix.com/p/marcrist-pc650-diamond-core-drill-bit-52mm/3489r
at £44.99

The two most expensive Screwfix ones don't have a slotted body. Not sure
why, may have something to do with dust extraction.

Any experience of any of these drills?

The way this is going, with the benefit of hindsight I would probably have
been better off hiring something to do this job.

However I had no idea the brick in this area was so hard.

Time to review if hiring a core drill is now the way to go, or if I jjust
need one drill per brick!


Cheers



Dave R


--
Dell XPS laptop running W8.1

[tabb...@gmail.com]

Hiring someone is seldom the solution.

I would not pick diamond any time unless genuinely needed - it's far more money than TC so you get a lot less of it. TC is the practical option. I've too much experience of diamond tools that either contain very little diamond or lose it all quickly.

If it's going that bad why not drill in half an inch from each side then SDS the remainder out with a pointed chisel.


NT

[David]

Thanks for the reminder about TC.

Unfortunately I can only drill from one side because of a hanging wall
outside, so it has to be all done under the sink.

Nothing reasonable to hire at the moment.

I may buy a TC bit and see how that goes.

[David]

Hum - slightly different sizes.

50mm instead of 52mm.

I wonder if they fit on the same arbor?

[tabb...@gmail.com]

take it with you.


NT

[FMurtz]

You need those blokes that bored that hole into the bank.

[Yendor]

What sort of Drill are you using, as opposed to Drill Bits.

SDS Plus or SDS Max or Hammer Drill?

--
Yendor

[David]

SDS Plus.

However the core bit isn't designed to be used with hammer action, so as
far as I can tell all this does is match the drill shank on the arbor.

[Yendor]

On 23/08/2018 18:08, David wrote:
> However the core bit isn't designed to be used with hammer action, so as

I work in Aberdeen, and regularly drill through granite. Best thing is
to hire a Core drilling kit from the likes of Brandon Hire.

Something like this goes
http://www.brandontoolhire.co.uk/en/drilling/161-dry-diamond-core-cutter.html

--
Yendor

[John Rumm]

On 23/08/2018 16:03, David wrote:

> I'm almost through my first brick but my rate of progress seems to have
> almost stalled. I am now wondering if this sodding extra hard brick has
> worn down the diamond core.
>
> I have
> https://www.toolstation.com/shop/p47481
> at £25.

Have the teeth visibly shortened?

What rotational speed are you drilling at? (you should be ok with
1000rpm on a smallish core like that.

> Any experience of any of these drills?

Not those specifically - but I have used TS own brand in the past, also
Armeg. Marcrist are usually rated as good.

> The way this is going, with the benefit of hindsight I would probably have
> been better off hiring something to do this job.
>
> However I had no idea the brick in this area was so hard.
>
> Time to review if hiring a core drill is now the way to go, or if I jjust
> need one drill per brick!

Even in hard stuff you ought to get at least two or three holes per core
bit. You may find dipping in water from time to time helps. (lubricates
and cools it a bit)


--
Cheers,

John.

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[John Rumm]

On 23/08/2018 16:46, Chris Hogg wrote:

> Has the drill become 'blunt'? My experience of diamond cutting tools
> is limited to diamond saws of about thirty years ago, but over time
> and with a lot of use they would become 'blunt'. That is to say, the
> metal in which the diamonds were embedded would get smeared over the
> diamonds and they lost their cutting action. The solution was to cut
> into a silicon carbide whetstone to abrade off the surface metal and
> re-expose the diamonds. Things may be different today with modern
> drills, of course.

Cutting into a bit of sandstone also works for a "glazed" drilling
surface...

[Rod Speed]

"Yendor" <no...@nowhere.com> wrote in message
news:plmp42$pi7$1...@dont-email.me...

You don’t use any of those with a diamond bit.

[Peeler]

On Fri, 24 Aug 2018 05:37:26 +1000, cantankerous senile geezer Rot Speed
blabbered, again:

>>>
>>>
>> What sort of Drill are you using, as opposed to Drill Bits.
>>
>> SDS Plus or SDS Max or Hammer Drill?
>
> You don’t use any of those with a diamond bit.

Doesn't he, you pathological wisenheimer?

--
FredXX to Rot Speed:
"You are still an idiot and an embarrassment to your country. No wonder
we shippe the likes of you out of the British Isles. Perhaps stupidity
and criminality is inherited after all?"
Message-ID: <plbf76$gfl$1...@dont-email.me>

[alan_m]

On 23/08/2018 20:37, Rod Speed wrote:

>
> You don’t use any of those with a diamond bit.

Rubbish, they all can be operated in non-hammer mode.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

[Rod Speed]

"alan_m" <ju...@admac.myzen.co.uk> wrote in message
news:fu9i9m...@mid.individual.net...

> On 23/08/2018 20:37, Rod Speed wrote:
>
>>
>> You don’t use any of those with a diamond bit.
>
> Rubbish, they all can be operated in non-hammer mode.

Sure, but if you do that, it doesn’t matter which he is using.

He is in fact using a standard drill he bought for the job.

[GB]

On 23/08/2018 18:20, John Rumm wrote:
> On 23/08/2018 16:03, David wrote:
>
>> I'm almost through my first brick but my rate of progress seems to have
>> almost stalled. I am now wondering if this sodding extra hard brick has
>> worn down the diamond core.
>>
>> I have
>> https://www.toolstation.com/shop/p47481
>> at £25.
>
> Have the teeth visibly shortened?

Or measure them. I guess the 10mm shown on the side is the tooth length?

I notice it says "Not to be used on hammer action." Wouldn't it be an
awful lot quicker to have a drill bit that you can use on hammer? (I've
never had to do this job, so please excuse the foolish questions.)

[Peeler]

On Fri, 24 Aug 2018 17:14:16 +1000, cantankerous senile geezer Rot Speed
blabbered, again:

>>> You don’t use any of those with a diamond bit.
>>
>> Rubbish, they all can be operated in non-hammer mode.
>
> Sure, but if you do that, it doesn’t matter which he is using.
>
> He is in fact using a standard drill he bought for the job.

Somebody should nail up your big mouth with a tacker finally, Rot!

[David]

I rubbed the diamond area to see if there was any diamond left and after
that it seemed to cut a bit better. So I started cleaning it regularly
with a wire brush which seemed to help.

I also made an effort to vacuum out the brick dust very often.

These two things seemed to improve things, and I am finally through the
first brick.

Going to try SDS drill and chisel on the second (outside) brick from the
inside to see if that speeds things up.

[John Rumm]

If you don't mind a huge "exit wound"!

[John Rumm]

On 24/08/2018 09:21, GB wrote:
> On 23/08/2018 18:20, John Rumm wrote:
>> On 23/08/2018 16:03, David wrote:
>>
>>> I'm almost through my first brick but my rate of progress seems to have
>>> almost stalled. I am now wondering if this sodding extra hard brick has
>>> worn down the diamond core.
>>>
>>> I have
>>> https://www.toolstation.com/shop/p47481
>>> at £25.
>>
>> Have the teeth visibly shortened?
>
> Or measure them. I guess the 10mm shown on the side is the tooth length?
>
> I notice it says "Not to be used on hammer action." Wouldn't it be an
> awful lot quicker to have a drill bit that you can use on hammer? (I've
> never had to do this job, so please excuse the foolish questions.)

Diamond cores don't have teeth as such - just wide areas of abrasive,
with some gaps to clear the dust. They cut the masonry with an abrasive
action, so the hammer action will not help - since you want constant
contact and pressure.

The TCT core drills with little carbide teeth, can be used with hammer,
since that helps drive the teeth into the masonry, while the rotation
excavates the spoil.

[Fredxx]

On 24/08/2018 11:51, John Rumm wrote:
> On 24/08/2018 11:19, David wrote:

<snip>

>>
>> I rubbed the diamond area to see if there was any diamond left and after
>> that it seemed to cut a bit better. So I started cleaning it regularly
>> with a wire brush which seemed to help.
>>
>> I also made an effort to vacuum out the brick dust very often.
>>
>> These two things seemed to improve things, and I am finally through the
>> first brick.
>>
>> Going to try SDS drill and chisel on the second (outside) brick from the
>> inside to see if that speeds things up.
>
> If you don't mind a huge "exit wound"!

That is why I would attack this from both sides

I would use a long drill the same nominal size as the pilot through the
whole wall.

Even a small drill can create a large exit wound!

[David]

Normally I would do that but I can't get directly at the outside because
of a retaining wall which keeps the patio away from the house.

I managed by drilling with a long drill from the inside to establish where
the hole is, then attacking the outside at an angle with SDS drill and SDS
chisels.

Fortunately I had managed to drill at one end of a brick so three sides of
the hole were mortar, which made things easier. I just cut the end of the
brick off. It will take a bit of filling in but I plan to use expanding
foam finished off with mortar. Also for filling the old hole.

[Rod Speed]

"Fredxx" <fre...@nospam.com> wrote in message
news:plopu0$cs7$1...@dont-email.me...

> On 24/08/2018 11:51, John Rumm wrote:
>> On 24/08/2018 11:19, David wrote:
>
> <snip>
>
>>>
>>> I rubbed the diamond area to see if there was any diamond left and after
>>> that it seemed to cut a bit better. So I started cleaning it regularly
>>> with a wire brush which seemed to help.
>>>
>>> I also made an effort to vacuum out the brick dust very often.
>>>
>>> These two things seemed to improve things, and I am finally through the
>>> first brick.
>>>
>>> Going to try SDS drill and chisel on the second (outside) brick from the
>>> inside to see if that speeds things up.
>>
>> If you don't mind a huge "exit wound"!
>
> That is why I would attack this from both sides

But the OP has said that there is no access from the outside.

> I would use a long drill the same nominal size as the pilot through the
> whole wall.

> Even a small drill can create a large exit wound!

But that’s not a problem with a pilot hole when a
diamond drill is used after that for the hole itself.

[Peeler]

On Sat, 25 Aug 2018 04:52:07 +1000, cantankerous senile geezer Rot Speed
blabbered, again:

>> That is why I would attack this from both sides
>
> But the OP has said that there is no access from the outside.
>
>> I would use a long drill the same nominal size as the pilot through the
>> whole wall.
>
>> Even a small drill can create a large exit wound!
>
> But that’s not a problem with a pilot hole when a
> diamond drill is used after that for the hole itself.

My... you ARE an "argumentative asshole" as someone put it so well, Rot! LOL

--
Sqwertz to Rot Speed:
"This is just a hunch, but I'm betting you're kinda an argumentative
asshole.
MID: <ev1p6ml7ywd5$.d...@sqwertz.com>