I just posted a link to this thread for someone that was asking about doing screw builds and I realized that I had another post elsewhere on the web that should be here....
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http://www.gunsnet.net/forums/showthread.php?t=208564
Quote:
Posted: 10-06-2004, 09:40 AM
Quarterbore
Tapping the trunions is almost black magic IMHO!
I broke my first tap because I was stupid...
I broke my second tap because I was learning...
I broke my third tap because of bad luck...
I broke my fourth tap because these F-ING little taps don't like steel that hard!
Moral of the story... The front trunions normally don't cause me problems but I do use lots of oil and pull the tap out several times and clean out the hole...
Make sure you get a nice clean hole to start with and if you drill and leave part of the rivet in the hole and you drill all the way through the rivet and try to tap it the rivet WILL bind to your tap and it WILL BREAK! When doing the rear trunion, I don't suggest getting greedy and trying to tap real deep as it seems to me that after a set point in time the F-ING taps say F-YOU and BREAKS!
I also suggest getting several spare taps... Get a couple for the normal taps in 10-32 plus a couple of the the bottoming type... When the tap starts looking rounded toss it! If you need to force the tap and it starts to creak in a hole... and you are lucky enough to get it out... TOSS THE TAP as once these decide to go they can go quick with little force required....
I have now drilled and tapped four kits and when I did the last two I really thought I had things figured out... I still had two taps break and what a royal PITA it is to get them removed!
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Also, see this thread with more info on how to TRY and remove a broken tap!
http://www.gunsnet.net/forums/showthread.php?t=187558
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