I can't seem to get masonry drills to last more than a few holes....
Drilling into clay brick or concrete, even if I take my time and keep
inserting/removing the bit into the hole being drilled, they just seem to
blunt in no time at all. My question is - would it be much better if I use
a hammer drill? I have a decent De Walt drill, but not a hammer. Is there
anything else I could do to make them last longer?
Hammer drill will work a lot better than a regular drill. Rotohammer with
SDS bit will work even better. The main thing I have found is that running
them at high RPM burns them quickly. Have a star chisel the size of the
hole so that if you hit something, you can insert the star chisel, rap it a
couple of times, and fracture the aggregate or hard particle blocking the
bit. Use something that is made of hard steel if you don't have a star
Flood the hole with water to keep the tip of the bit cool.
In general the rapid dulling is due to the tip heating up and wiping out
the heat treatment of the metal(s).
But even a cheap (less than us $50) hammer drill is orders of magnitude
better for the job.
I have a Black & Decker 1/2 inch drill that has a setting for "hammer"
for "normal". The hammer drill makes the work a lot easier since it "chips"
away and the rotation just spins the material out of the hole. I suspect the
heat in chipping is a lot less than just trying to grind out the concrete
you are using Dollar Store masonry bits, that could be your problem, as
the fellow above says...
Andy in Fink, Texas .
If your buying el cheapo bits at the home center then there is nothing you
can do. Even with a hammer drill they will go away pretty quick.
Bite the bullet and buy a Hilti, Bosh, or comparative hammer drill. I have
Hilti bits that are 10 years old and work just fine. Bosh is a good drill as
long as you stay under a half inch. I have a De Walt cordless that has a
hammer selection. Unless I am using 1/4 holes for plastic anchors I get out
I have a TE-52 and up to 2" bits. As well as the points and spade bits.
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