Quote:
Originally Posted by shaunjohnson
if un-annealing means un-hardening then it was fine to drill with.
just heat up till red hot, then cool as slowly as possible for 24 hours (cement dust works a treat) and then drill with a standard drill bit.
edit: first LST diff in final stages now, i ended up using the traxxas center diff gear on the LST diff instead as that is what i had on hand. will fill with 100k oil then go try and kill it on 6s 
shaun |
Annealing is softening the metal. I did spot annealing at the suggestion of some guys on a CNC forum. Yes, the metal drills very easily after annealing.
What I was saying is I would like to compare drilling the annealed metal to drilling the stock un-altered hardened metal, and see just how much the annealing actually helps.
I don't think you need to wait 24 hours and use the cement dust. Cement dust or not the metal will be cooled to ambient temp within 15-30 min. at most