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Hi Guys - just like to clarify why I said to drill the clearance holes first - in effect spotting the hole for the tapping drill. It is always good practice to take out the top thread of any tapped hole. It is much better to do this before tapping as if done afterward that small countersink, for that's what it is, will follow the thread and go eccentric. Taking out that first thread definitely makes the tapping easier and subsequently aids inserting the bolts later especially if they are in awkward to get at places.
Secondly and probably far more important, if opening out pre drilled tapping holes, particularly on brass or bronze there's a very good possibility that the part will snatch and pull up the drill if this op is carried out on the drill press, which in all probablilty it will be if tackling it this way. It wouldn't be the first time a tapped hole has been ruined in this fashion that's for sure - yes, you can stone the drill cutting edges but why do that only to have to resharpen.
When spotting through like this if the drill depth stop is set not only will the spotting depth be consistent but the tapping drill will centre nicely too - it can then be drilled to depth without fear of a mishap.Only passing on a lifetimes habit - that's not to infer anyone else's method is wrong.Good luck Vince however you go about it.Regards - Ramon
the first bit of thread is not to full depth.
Quote from: Jasonb on January 07, 2014, 08:37:35 PMI think most people buy the screws and cut them to the length required which if it were a bolt may remove too much thread. You might as well use threaded rod Jo
I think most people buy the screws and cut them to the length required which if it were a bolt may remove too much thread.
Marv"Anality" has now been officially added to the MEM lexicon.
Quote from: sshire on January 07, 2014, 08:28:17 PM Marv"Anality" has now been officially added to the MEM lexicon. I'm flattered. Even more so now that your research reveals that anality is a genuine word found in several dictionaries. I had no idea.Nevertheless, the success of this word-coining has emboldened me. Given the opportunities afforded by this forum, I'm sure I can come up with some really stunning additions to the local lexicon.
Ever since my teens, I've hated studs - the thread on the exhaust studs on for instance a Puch mopeds always disappeared after a few years
Blame the material, not the stud! Make a set out of stainless or bronze and they will last forever and a bit.