https://www.screwfix.com/p/erbauer-e...220-240v/232fv

I'm about to buy this SDS hammer drill but I'm not sure if it's powerful enough to easily drive a 150mm core bit. Anyone know if it is?

And in general is there a table or something that tells you what power of drill you need to drive various sizes of core bits?

Thanks.

Forgot to say it's not a diamond core bit it's the one with teeth.

On 10/09/2020 08:31, me wrote:
https://www.screwfix.com/p/erbauer-e...220-240v/232fv

I'm about to buy this SDS hammer drill but I'm not sure if it's
powerful enough to easily drive a 150mm core bit. Anyone know if it
is?

And in general is there a table or something that tells you what
power of drill you need to drive various sizes of core bits?

With insufficient power you cannot cut as fast. It depends a lot what
you are cutting. Almost anything will go through breeze block but high
fired Victorian engineering brick is another matter entirely.

The guy who put the air vent in my outside wall had a lot of fun and
burnt out one core drill. It became pretty well toothless. The bricks
are old Victorian ones from local clay with small half roundish flints
embedded in it that caused the drill to jam rotating the operator.

He got used to it after the first fairly spectacular jolt but the drill
didn't and became toothless about half way through. ISTR it took him
about three hours with one half hour break to get a new core drill.

--
Regards,
Martin Brown

On 10/09/2020 08:31, me wrote:
https://www.screwfix.com/p/erbauer-e...220-240v/232fv

I'm about to buy this SDS hammer drill but I'm not sure if it's powerful enough to easily drive a 150mm core bit. Anyone know if it is?

And in general is there a table or something that tells you what power of drill you need to drive various sizes of core bits?

Thanks.

Last time I did a 5 inch core I used the "next size up" SDS, that was
through limestone and brick.

As Martin says, a lot depends on the material.

On 10/09/2020 08:40, Martin Brown wrote:
On 10/09/2020 08:31, me wrote:
https://www.screwfix.com/p/erbauer-e...220-240v/232fv


Â*I'm about to buy this SDS hammer drill but I'm not sure if it's
powerful enough to easily drive a 150mm core bit. Anyone know if it
is?

And in general is there a table or something that tells you what
power of drill you need to drive various sizes of core bits?

With insufficient power you cannot cut as fast. It depends a lot what
you are cutting. Almost anything will go through breeze block but high
fired Victorian engineering brick is another matter entirely.

+1

I've done a couple of 100/115mm holes with a Dewalt 2kg SDS (700W, 2J
impact) and found with one hole rotation was getting difficult which I
put down to the waste material not being cleared from the cut groove and
binding on the side of the cutter. The solution I found was to go in so
far and then use a cold chisel and lump hammer to remove the core of
material to the cut depth. This also allowed the wastes from the
previous cut to be removed. I repeated this process a couple of times
when going through 9 to 12 inches of material.

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

On 10/09/2020 08:31, me wrote:
https://www.screwfix.com/p/erbauer-e...220-240v/232fv

I'm about to buy this SDS hammer drill but I'm not sure if it's
powerful enough to easily drive a 150mm core bit. Anyone know if it
is?

Its borderline, but will probably be ok - I have a 720W Makita 2kg class
SDS, and have managed to drill a number of 4" diamond cores with it, and
possibly a 5" (never tried 6"). However their 850W 8406 model is rated
for 150mm cores.

And in general is there a table or something that tells you what
power of drill you need to drive various sizes of core bits?

There is more to it than just power.

The main thing with core bits, is there is a very high chance that you
will snag and stall the core bit several times in drilling a core. That
makes a safety clutch essential. The problem I found with using my SDS
is that the clutch is set to let go at a much lower torque than is ideal
for core drilling. So you have to take it very gently, and try and keep
as straight as possible. (also hope the wall is not damp!) Otherwise it
can be frustrating keeping the core actually spinning.

Core drills tend to be set at higher slip torques, and are usually
equipped with long side handles to make it easier to keep a grip on it.

Also consider endurance, if coring hard stuff, then they can take a long
time - so a drill rated for continuos operation is worthwhile - and not
all tools are.


--
Cheers,

John.

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

On 10/09/2020 08:31, me wrote:
https://www.screwfix.com/p/erbauer-e...220-240v/232fv

I'm about to buy this SDS hammer drill but I'm not sure if it's powerful enough to easily drive a 150mm core bit. Anyone know if it is?

And in general is there a table or something that tells you what power of drill you need to drive various sizes of core bits?

A 150mm bit is big for that, so you won't be cutting fast. It's got a
clutch which is good. You may well shag the bit if you use hammer
action, see any info that came with the bit if you have it. Always clear
detritus from the cut, and frequently.

On Thu, 10 Sep 2020 14:39:00 +0100, Chris Bacon wrote:

On 10/09/2020 08:31, me wrote:
https://www.screwfix.com/p/erbauer-e...220-240v/232fv

I'm about to buy this SDS hammer drill but I'm not sure if it's powerful enough to easily drive a 150mm core bit. Anyone know if it is?

And in general is there a table or something that tells you what power of drill you need to drive various sizes of core bits?

A 150mm bit is big for that, so you won't be cutting fast. It's got a
clutch which is good. You may well shag the bit if you use hammer
action, see any info that came with the bit if you have it. Always clear
detritus from the cut, and frequently.

My old Powercraft SDS did a 115mm hole without a problem. Just take it easy;
by being gentle I did a 38mm hole with an 18V combi (no hammer, of course).
The force required was far less than the drill would take - beyond a certain
point the rate reduced to near zero for some reason.
--
Peter.
The gods will stay away
whilst religions hold sway

On Thursday, 10 September 2020 08:31:38 UTC+1, me wrote:
https://www.screwfix.com/p/erbauer-e...220-240v/232fv

I'm about to buy this SDS hammer drill but I'm not sure if it's powerful enough to easily drive a 150mm core bit. Anyone know if it is?

And in general is there a table or something that tells you what power of drill you need to drive various sizes of core bits?

Thanks.

I cut a 2 or 2.5" hole in masonry with an ancient B&D once, it did it no problem. Your SDS is several times the power & several times less rpm, so I'd expect it to be capable. That doesn't imply it'll be quick. And there are wall materials out there that even an SDS drill can't penetrate.

Once you get the centre bit through & core drill a bit into both sides, it becomes possible to bust lumps out without breaking the face. You should break the centre plug out to at least reduce the risk of a jam, which is high and can injure you & the core drill. With a little care extra breaking out can speed things up some.


NT