Core drilling dilemma

johnny2007 · 23 Dec 2012

Hi everyone,
Tired of paying for core drill bits rental, I bought my own.
I went for this makita diamond core set of 5.

http://ffx.co.uk/tools/product/088381705370 makita p-74712 diamak dry diamond core kit 10pc 5 core

I have an sds drill Makita HR2470 and I want to use it with these core bits, however, even if I drilled tens of 4" holes in my career, I never used this drill.
The HR2470 has a mechanical clutch, but I never had a chance to test it.
Do you know any safe method to test the clutch?
I have heard some horror stories about people breaking their wrists.
Thanks for any advice

foxhole · 23 Dec 2012

You should be using at low speed so no danger of breaking anything.

johnny2007 · 23 Dec 2012

foxhole said:
You should be using at low speed so no danger of breaking anything.

Yes, I always do, but even at low speed, if the clutch doesn't engage, the torque of the sds will take me with it.

Nigel_Cro · 23 Dec 2012

johnny2007 said:
I have heard some horror stories about people breaking their wrists.

Been there, done that! Ok, so I didn't break it, just very badly sprained, took about two months before I could even think about using it properly, even now, 4 months later, I wear a wrist support for 'heavy' work.

Guy at the hire shop told me to turn off the hammer action, but not to leave the clutch on.

I would start at the lowest setting and work up until it just drives through the brick/block without constant slipping.

HTH

catlad · 24 Dec 2012

It seems very fashionable these days to core drill pipes through walls, can someone tell me how long it would take on average to put a soil pipe through a cavity wall.

johnny2007 · 24 Dec 2012

catlad said:
It seems very fashionable these days to core drill pipes through walls, can someone tell me how long it would take on average to put a soil pipe through a cavity wall.

Just done two 117mm sleeved vents.
Took me 2 hours in aereate concrete, but I hit a wall retaining tie, so I had to chisel a bit on the side to avoid it.
Overall I say that it takes around 10 minutes per wall leaf to drill, then thete's the cleaning, moving the platform etc. Hence 1 hour per vent.
Makita hr2470 is suitable as the clutch kicks in if the core jams.
A little advise: if the core keeps jamming, chisel off the bit of the brick/concrete you have already cut. It breaks very clean up to where you have cut and then is like starting on a flat wall with no jam.

Norcon · 24 Dec 2012

catlad said:
It seems very fashionable these days to core drill pipes through walls, can someone tell me how long it would take on average to put a soil pipe through a cavity wall.

About 15 minutes. Stitch drilling and kango.

Went through a reinforced concrete wall 300mm thick a few weeks ago with 35n concrete fully set to put a sewer pipe through..
Kango and drilling method. Sixteen 16mm high tensile reinforcing bars were also cut through. That took nearly three hours.

johnny2007 · 24 Dec 2012

Norcon said:
catlad said:

It seems very fashionable these days to core drill pipes through walls, can someone tell me how long it would take on average to put a soil pipe through a cavity wall.

Click to expand...

About 15 minutes. Stitch drilling and kango.

Went through a reinforced concrete wall 300mm thick a few weeks ago with 35n concrete fully set to put a sewer pipe through..
Kango and drilling method. Sixteen 16mm high tensile reinforcing bars were also cut through. That took nearly three hours.

I got to say that stitch drilling would have taken a much shorter time.
Maybe as the hole is usually covered by vents or in case of pipes the border is filled, it would be a good idea to go through half inch with the diamond core, just to give the impression of a neat line and also a guide, and then stitch drill.
I try next time and see how long it takes and how good it works.

catlad · 24 Dec 2012

Thanks I have always stitch drilled if I have wanted to put a pipe through a wall myself.

BZ2 · 29 May 2015

The HR2470 instructions say to not use hole saw bits, because the tool is not adapt to that use, as hole saw bits cause the torque limiter to intervene too much frequently, and excessive use of the torque limiter will speed up the wear of the tool.

joe-90 · 29 May 2015

Holes vary. Did a 110mm one yesterday in five minutes. A couple of months ago I did a 50mm which took two hours.

neds · 31 May 2015

I've got a cheap Titan 5kg one for core holes I'd rather break that than my expensive makita sds. Easy work use the extension handle. Never had a problem with it.

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Core drilling dilemma

Similar threads