Speed of SDS is wrong for coring. You could try chain drilling round the circle with a long thin (6mm) SDS bit, just an inch deep at a time, usually helps a bit. When my proper core drill packed up I found my 18v DeWalt was actually better than my massive Bosch SDS.
Core hole - carry on or hammer action and bash through?
- Thread starter benjiman
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Thanks will try chain drilling to help it along.
Im not running the drill on full power, keeping the revs pretty low.
Maybe ill try with my 18v cordless then? At least that way can control the speed better.
Yes, it saves the pilot having to drill its way through and you then know exactly where it will appear at the far side. You can then drill most of the way from one side, then finish it off from the far side, making a clean hole at both sides.
That only works for me when I've piloted the centre hole then put a bar in the centre of the core (instead of the drill bit)
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Sometimes, once the core drill has some decent amount of guidance, I discard the pilot drill.
So the chain drilling helped a lot I think. 30 mins later and I cored through the remaining with relative ease.
Got about 5 holes all the way through before I couldnt do anymore as the bit kept slipping back into the holes close by.
But all in all worked pretty good.
Cheers all!
Got about 5 holes all the way through before I couldnt do anymore as the bit kept slipping back into the holes close by.
But all in all worked pretty good.
Cheers all!
Having looked at the Screwfix site, it is supplied without the arbor or guide pin. I guess you purchased the arbor, did you purchase the centre pin as well?
I have only drilled a dozen or so cores. I prefer to use a long drill, the same diameter as the pin, drill all the way through (using SDS), expecting a tiny bit of breakout on the exterior, and then drill the core with the pin from both directions.
I have only drilled a dozen or so cores. I prefer to use a long drill, the same diameter as the pin, drill all the way through (using SDS), expecting a tiny bit of breakout on the exterior, and then drill the core with the pin from both directions.
I bought the set with 3 different core holes. Comes with arbour and extension as well for £70.
This one I take it
https://www.screwfix.com/p/erbauer-diamond-core-drill-kit-8-pcs/96229
I have never understood why those kind of kits are sold with an SDS type drill for the center given that you cannot use hammer action when using the cores. Surely if using that set up and trying to drill in to hard bricks, the main obstacle will not be the cutting action of the diamond tips but the inefficient center drill bit?
As I said earlier. I prefer to use a SDS drill bit longer than the depth of the wall and then let the center guide pin in the arbour follow that hole.
That said, the only kit at Screwfix that has a guide rod rather than an SDS type bit is the Rothenburger kit. On reflection, I think my arbor is the Rothenburger one.
SDS drills often have a safety clutch in them so when the diamond bit jams and it will do sooner or later the clutch operates rather than the drill unit spinning round and breaking your wrists.
In fact I'd say do not ever use a diamond core drill on anything other than a SDS drill unit with integral clutch fitted.
In fact I'd say do not ever use a diamond core drill on anything other than a SDS drill unit with integral clutch fitted.
Yup when doing mine with a makita sds drill it did jam but the clutch kicked in and stopped the drill rotating.
For harder bricks i drill the pilot hole all the way first.
Then core the first inch or so.
I then drill several 6mm holes all along the circle.
Then core again and it goes through a lot easier without jamming.
Just don't put any pressure on it.
Same on the external skin and you'll end up with perfect clean core circles on both sides of the wall.
Then core the first inch or so.
I then drill several 6mm holes all along the circle.
Then core again and it goes through a lot easier without jamming.
Just don't put any pressure on it.
Same on the external skin and you'll end up with perfect clean core circles on both sides of the wall.
A diamond core should be able to go through any common brick or block wall without any faffing with pilot holes or supplementary stitch drilling.
Slow speed and only light pressure, and possibly frequent pulling the bit back a little to release the dust.
Slow speed and only light pressure, and possibly frequent pulling the bit back a little to release the dust.
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