Nice job!
However, I'll bet the mold warp after machining was just the internal stress relieving of the alum plate.
Taking 0.100-0.250" off the backside first will help reduce
the tweak after cavity machining.
If possible, in the future, leave 1/4" fat all the way around and put it outside in the sun for a week, or a month, is best. A poor man's stress relieve, else pay to have it done at a heat treating company.
Good luck,
Pres |