Screw end modification fixture

[mklotz]

I often have to make modifications to the ends of tiny screws. Often enough that it behooved me to make a jig.



A brass 'collet' is made for each size of screw by tapping a short slug of brass with the required thread and then milling a small flat on the slug. The screw is then threaded through the collet and secured in place with a lock nut. The collet is then inserted into a steel tube and locked in place with a set screw.

The whole assembly is then stuck in a collet and the required work performed. (The picture shows a dog point put onto a 2-56 screw.)

[jimmstruk]

Neat, good solution to a really tough problem. JIM

[Bill Pace]

Another one of your NEATO gizmos, Marv

I love your stuff,--- keep em comin'!!

[rklopp]

I'm curious--why the intermediate steel piece between the brass slug and lathe collet? Why not simply grab the brass slug in the lathe collet? That's what I do.

[BadDog]

To get the screw clear of the collet?

[mklotz]

I'm curious--why the intermediate steel piece between the brass slug and lathe collet? Why not simply grab the brass slug in the lathe collet? That's what I do.

Yes, that's an alternative. However, I frequently use this fixture to hand hold small screws to grind or polish the ends and I need something to grab onto. Also, the tube gets the tiny screw away from the end of the collet if I'm doing a milling operation where fouling the mill holder is a possibility.