Tapping weight bolts

Bumlak

Bumlak

AzB Silver Member
Silver Member
So I was experimenting with tapping my own weight bolts using a 5/16-18 cap head and tapping to a 8/32". The problem I ran into is that once the bolt is drilled, it seems to want to turn in the headstock when I start to tap it. I guess I could just thread a nut on it and lock that down but I was just curious how it's actually SUPPOSED to be done.
 
Normally for holding threaded rod/ bolts/threaded things, making a split bush of that thread form works very well. It then clamps on the thread form itself, not the crests of the thread form. You could use a nut, but generally nuts are made to the loose side of the thread tolerance and often are not concentric to the hex of the nut itself.
 
conetip said:
Normally for holding threaded rod/ bolts/threaded things, making a split bush of that thread form works very well. It then clamps on the thread form itself, not the crests of the thread form. You could use a nut, but generally nuts are made to the loose side of the thread tolerance and often are not concentric to the hex of the nut itself.
Click to expand...

So Neil,

Basically, make a delrin collet, thread it and then split it?

Erich
 
Bumlak said:
So I was experimenting with tapping my own weight bolts using a 5/16-18 cap head and tapping to a 8/32". The problem I ran into is that once the bolt is drilled, it seems to want to turn in the headstock when I start to tap it. I guess I could just thread a nut on it and lock that down but I was just curious how it's actually SUPPOSED to be done.
Click to expand...

It becomes just another futile effort in mental masturbation............ just buy them......... move on to a better use of your time..................

Kim
 
Are you trying to tap these weight bolts with them chucked up in a Hightower lathe? The aluminum jaws won't be much of a friend if that is the case.

The split nut is your best move. Tommy D.
 
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