I'm making small parts with M4 (close to 8-32) threaded male ends. The
metal ends are occasionally snapping off, usually near the shoulder.
Can suggest a way of increasing the strength of the part? They're made
on a screw machine using a die, and are made from 7075 aluminum, T6. I
can't change/increase the thread size.
I'm testing out re-artificially ageing them, at 250 deg. F for 24 hours
in a small oven. I'm not sure how I'll test if they're stronger than
before, but I'll figure out some creative way.
Is re-ageing them even worthwile? My thoughts are that the
screw-machine is stressing them, and that this will strengthen them.
- posted 15 years ago