Walls too hard to drill

[lisaH]

We're trying to put in a new kitchen but we are finding it impossible to drill into the walls more that 1/2 inch - despite using a masonry drill bit and the hammer setting on the drill. One masonry bit is completely bent and we've already burnt out one drill! The building is Victorian.

Does anyone know of any tools/accessories/techniques that might help?

[Sorry if this is in the wrong forum but none of the others seemed more appropriate]

 

[2scoops0406]

What kind of drill / masonary bit are you using, what are the walls made of?

 

[lisaH]

The walls are covered in plaster so we haven't been able to work out what they're made of. However, certain areas seem to be much harder than others.

The first drill burnt out but the current drill is a Draper Expert SDS + Rotary Hammer Drill, 500 W, 0-950 rpm and we've tried a masonry drill bit (that bent), then a narrower masonry bit, then a metal one!

 

[Jasonb]

SDS drill should have enough weight behind it, you have got it going the right way? Some old victorian bricks can be very hard try an SDS+ drill around the 4kg size, this rotates slower but has a much stronger hammer action.

Jason

 

[2scoops0406]

SDS drill should have enough weight behind it, you have got it going the right way? Some old victorian bricks can be very hard try an SDS+ drill around the 4kg size, this rotates slower but has a much stronger hammer action.

Jason

If it is flint then you have a problem. to get through this you need diamond core drills, very expensive. If not though, some cobalt drill bits will pretty much get through any kind of brick.

 

[danman]

Sorry if this sounds basic, you said it was set to hammer, I take it you did mean drill & hammer?

Most sds+ drills have 3 settings drill, drill & hammer and then hammer only.

It is worth spending and get a good sds bit, the cheap ones can be useless.

 

[Dewy]

A word of warning if you try a cobalt drill bit.
They will drill almost any material except glass but the word is DRILL.
Dont use hammer action.
Thats like hitting the bit in with a hammer which breaks the material instead of drilling into it.