Does anyone make a two diameter drill bit that drills the pilot hole and clearance hole at the same time?
I know you can get the sets with countersinks, and some of them have an extended shaft from the countersink that does create a clearance hole, but all the sets I've found like this drill, at most, a 3/8 deep clearance hole. I typically need 3/4". Plus, those little wings get dull very quickly when drilling abrasive materials.
I'd like a set of bits that have a pilot diameter section an inch or so long, and then widen out to clearance hole size for at least another inch.
I've tried the tapered bits, and they work after a fashion, but they seem to break easily, and they also dull very quickly in mdf or similar materials.
This comes up all the time in remodeling, and also when I'm building jigs and fixtures out of mdf, which can split if you don't drill a pilot. I generally don't need or want a counterbore or countersink, and when I do I don't mind doing that as a separate step.
When I have a bunch to do, which seems to happen fairly often, I set up two drills with the right bits. But it's still a pain and takes way too long. I'd like a one step solution.
My searches have only turned up the pilot/counterbore/countersink combo bits, or the step bits that can drill 8 or 10 different holes sizes in thin material.