April 19, 2016
Today I installed five clocks, four were on cinder
block wall. Using small platic anchors, and a 1/36
masonary bit in a high speed hammer drill.
What I noticed, after about 1/8 or so into the wall,
the bit progress was a bit faster. Took a lot of
work to get the first 1/4 inch or so.
Are the surfaces of cement harder? Or does the tip
of the bit heat up and work better when it's hot?
| Are the surfaces of cement harder? Or does the tip
| of the bit heat up and work better when it's hot?
No. Better to cool it with some water. You may have
hit a pebble. Concrete can vary a great deal in terms
of hardness. Some is soft. Some is nearly impossible
to get through.
Depends how much Viagra was added to the cement. More viagra makes it
get HARDER! :)
Seriously, the very surface often has more portland cement because of
troweling. So, it may be a little harder. Also, the rock may be quite a
bit softer, but that depends on where the quarry is located. Your bit is
going thru stones, sand, and the actual cement. So there will be a lot
of variances as you drill thru it. Also, some concrete blends are harder
than others. It depends on how much portland cement is added, and in the
case of precast concrete, it's harder yet, based on other additives.
Dont forget, you could drill thru rebar and wire mesh too.
You DO NOT want your bits getting hot. Run a slow trickle of water as
On 4/19/2016 10:39 PM, firstname.lastname@example.org wrote:
Well, that makes sense. Might been different
hardness, near the surface.
In this case (four holes, about 1/2 inch deep,
timed about ten minutes apart), not much chance
of over heating a drill bit.
I'm guessing if I set up a garden hose or some
cooling system, the church would not be pleased
with all the water and cement dust running down
the class room walls.
On Tuesday, April 19, 2016 at 7:38:55 PM UTC-5, Stormin Mormon wrote:
...even if you meant to say 1/32"? They don't plastic anchors that small...3/32" possibly. I've bent 1/8" in masonry...can't imagine putting the necessary pressure with a hammer drill on "1/36 in"! Never noticed any difference in hardness.
Remember that he tip of the bit - the cutting part - is "V" shaped. When
you first start drilling, only the very tip is in contact with the concrete
and the going is slow. As you go deeper, more and more cutting surface is
in contact and the cutting is faster.
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