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I keep breaking taps
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matt4949:

--- Quote from: Nephasth on November 25, 2012, 07:17:27 pm ---Paint thinner works great for keeping the tap cool and lubricated. Little secrect I learned manufacturing LBH drill rigs.

--- End quote ---
I will try this as I have a habit of working on junk and find myself tapping alot more than I should.
DeLuSioNal29:
Using a drill:


and manually:


D
Le Chuck:
All good advice guys, thanks. I'm using copious amounts of cutting oil and the drill size recommended by the manu of the tap but I think it may be a bit tight. I'm generating a lot of waste off the tap. I'm also going to try the power drill technique. I'll report back. Thanks again!
johnm:


Drill size, correct lubricant and the correct size of dwang, too big and you wont feel the tap stress, do not use a shifting spanner or ratchet.. Also make sure you have the right tap, tapering taps cut less for the first few threads making it easier and causes less stress on the tap.
RandyT:
Another thing to watch for is whether the tap is perfectly in-line with the hole.  If it goes in at the slightest angle, it can bind at some point and break.  A larger tap can handle more stress, and might be able to cut it's way through if it's off just a tiny bit, but a small one won't have a chance.  Also, smaller taps have less room for chips, so backing it out a couple of times to clean it off and blowing out the hole, might help.

The best approach would be to go with the drill press suggestion.  Lock the vice down, and the part in it.  Drill the hole, remove the bit from the chuck, chuck up the tap, and with the power off, turn the chuck by hand while putting light downward pressure on the handle.  This should help keep everything lined up.
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