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The other day we were drilling holes for concrete anchors with a roto-hammer(Hilti TE22) when the new bit we have became bound up in the hole.I was wondering if anyone has any suggestions for getting it out of the hole.
jim”stuck in the wall”at great white
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Replies
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Kind of like licking the swing set at -25 below.
This has happened several times to some of our guys when we drill into older concrete and the focus is on how hard they can push the bit into the slab and don't bother to lift the bit up once in a while or have some air handy to clear away debris.
Two things typically happen to extricate, the first is that a good deal of air directed down the hole can start the removal of excess dust and fragments and give you some freeplay to extract the bit. Secondly,you may have passed next to rebar and it just loves to grab into the spirial, (You're SOL) Just release the bit and drill next to it until you are 1/2 to 2/3's of the way down and head over to your original hole and this will give you enough play to extract it.
Green concrete can be a bit tricky as your heat generated will speed up the cure, but method #2 might work.
On both methoods be careful not to hit your original bit. Once you get the bit out inspect it for the why it stuck, Flutes plugged with adheasive, Dull carbide tips will result in under sized holes and hamper material removal and so on....
*..........you may have a cold enough night to use a freeze cycle...if you pour water down along the bit will it freeze and expand the hole ???usually if I get bound up its cause I bent the bit...can you switch to a more powerful hammer and rotate it??will it rotate ?what about pouring Marvel mystery oil down the hole ???and wait a day ???kind of like the sword in the stone....you get some sucker that diddly bops up and just pulls it out....pay him anything he wants...
*I gotta agree with Anderson. I have done this same thing many times, and drilling next to the original hole and making a larger one is usually the only thing that works. I usually drill a few smaller holes (or same size will work) around the original hole, then take a mason chisel and a hammer and go for it. After you break up a bit of concrete, you can retrieve the bit. Damage to the concrete will require some repair, but it will be cheaper than a new bit. The bit's gotta come out one way or another.Just my opinion...James DuHamel
*I'm not even gonna ask what brand of hammer drill you got.
*It's amazing what you can find in the BT Archives!! ROTO-HAMMER DRILL-BITS refuse to return homeAll kinda interesting stuff is available via the b Search function at the top of your BT page!Actually, it's getting kinda boring around here. Same things over & over & over & over again!!!!!!Maybe I'll start a thread and ask what type of attic vents I should install!
*Matt,You have to admit that the responses this time are different. New ground is being covered. No one was going to suggest freezing water in July....Attic ventilation....hmm....sounds interesting!Rich Beckman
*Rich:Your right. Please excuse the baditude.