nestork wrote:

'Pete C.[_3_ Wrote:
;3251208']nestork wrote:-

'Pete C.[_3_ Wrote:-
;3250882']
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.-

Pete:
Any drill bit with a tungsten carbide point on it is meant to bash a
hole in the masonary in front of it. There's no such thing as a
masonry
bit meant to cut a hole the same way a twist drill bit does. Putting
a
masonry bit in a drill that only rotates is just going to grind a hole
in the masonry, and that will only work for very soft materials like
brick mortar.-

Sure they are. You go buy a pack of plastic masonry anchors that
include
a 1/4" masonry bit, chuck it up in a hammer drill or rotary hammer and
see how long it lasts. Then buy a proper quality hammer drill bit in
the
same size and try that. The quick ID is if it's got an all over silver
dip it's a cheap masonry bit suitable for rotary drills only, while
bits
that have other finishes are likely hammer drill bits, even though
superficially they look to have the same style carbide tip.

Pete:
You seem to be saying that the cheap masonry bits that come with a
package of plastic anchors are meant to be used in a drill that only
turns, but doesn't provide a hammering action. Sorry, this simply isn't
the case. No matter how cheap the drill bit is, if it has a tungsten
carbide tip, it's meant to BATTER a hole, not cut a hole like a twist
drill bit does.

And, even the cheap masonry bits that come with a package of plastic
anchors will last longer if used in a hammer drill. Using them in a
drill that rotates without any hammering action simply erodes the
tungsten carbide tip so that it dulls quickly.

I take it you've never actually tried this. Do you even own a drill?