T
Tired
I'm a builder rather than plumber so hadn't used core drills until now. I've bought a Dewalt D21570K which was recommended by a plumber. I went on to buy a set of Dart drill bits. Both items weren't bottom of the range but not far off. I only needed the drill to make three holes hence the desire to not pay much more.
I'm drilling through a concrete foundation which has been down for about a year. The drill seems to be struggling in the hole it's made rather than with the drilling of it. I'm past the drill bit now which is when my progress nose dived. I thought maybe it was causing a vacuum so I pilot drilled all the way through. This hasn't helped! The concrete may still be a bit wet although it is near the top of the strip about 10cm below the bottom block.
I've read a few things online about slots in the bit causing vibration and clogging but this doesn't seem to be my problem. Is there something I can put on the bit to lube it in the hole? Is it likely I need a better bit? I'd appreciate any thoughts or pointers.
I'm drilling through a concrete foundation which has been down for about a year. The drill seems to be struggling in the hole it's made rather than with the drilling of it. I'm past the drill bit now which is when my progress nose dived. I thought maybe it was causing a vacuum so I pilot drilled all the way through. This hasn't helped! The concrete may still be a bit wet although it is near the top of the strip about 10cm below the bottom block.
I've read a few things online about slots in the bit causing vibration and clogging but this doesn't seem to be my problem. Is there something I can put on the bit to lube it in the hole? Is it likely I need a better bit? I'd appreciate any thoughts or pointers.