On Sat, 21 Jun 2014 22:27:50 -0500, "Pete C."
wrote:


micky wrote:

Masonry bits. vs. Hammer drill bits

I had assumed they were the same. Maybe not?

Hammer drill bits seem very expensive. The cheapest was $4.50 and I
think that one was small. A lot are 40 dollars or more. That's more
than the drill was.

Masonry bits are intended for rotary drilling only and use cheap carbide
and other cheap materials. Hammer drill bits look similar, but use
higher grade materials to withstand the percussive forces of a hammer
drill or rotary hammer. If you put a cheap $5 masonry bit in a hammer
drill or rotary hammer it will be destroyed before it even finishes the
first hole.

BTW, reading wikipedia on SDS, it seems SDS allows only the bit to be
propelled at the target, not the whole chuck. Hence the smooth shank
and the way it's clamped in. And this is supposed to work faster.
Wouldn't it work better with the weight of the whole chuck behind the
bit?. Like the difference between one guy trying to break in a door
and a guy with a steel battering ram?