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Posted by on October 18, 2007, 3:29 am
Hi all,
I have a question about core drill bits: How long do they last? I've
got literally thousands of holes, 7/8" diameter, 3 1/2" deep to drill
into concrete and epoxy all-thread rods for a job, and none of the
factory reps seem to want to give me a straight answer on how many
holes I can get from one bit. The Hilti guy wouldn't even get pegged
down between 50 and 500. I can assume I'll hit the occasional rebar,
but the plans outline the bolts not being in line with the rebar. And
we all know that if it's in the plans that way, that's exactly how it
was built, right? I know I'll need a bunch of bits (right now I'm
figuring 200 holes per bit), but at a hundred bucks apiece, I want to
estimate enough of them into the job that I won't take a huge hit
buying bits.
I don't want to use a roto-hammer as most of these bolts are 4" away
from the edge of the concrete pedestal, and I'm worried both about
precision (not having the drill straight or having it wander) and
breaking off the edges of the concrete pedestals that I'll be drilling
on. Also, if I hit rebar with the roto-hammer, I'm in a bad way,
because these bolts can't be moved.
Third, how long does it take? How many minutes to core drill a hole,
remove the core, clean out the hole, insert some epoxy and set an
anchor bolt to grade? If my per-hole estimate is wrong by one minute,
that equals about 9 days of production. I realize it's just a guess,
but I want it to be an educated one, and frankly, I'm not very
educated on the production aspects of 7/8" core drilling. Currently,
the average of people I've surveyed is about 10 minutes.
If any of you have any thoughts or guidance on this issue, I'd
appreciate your wisdom and opinions.
Thanks,
Phil
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