I'm experiencing some difficulties in machining the seal as shown in the attachment.
-I started by chucking a 6 inch length of dia. 4.062 round stock in the 3 jaw.I faced one end and flipped the stock.
-The ID was bored (using a DCGT 32.51 Al cutter)and measured using a 3 point bore micrometer.
-The OD major diameter was turned using the same cutter geometry
-The OD step was then turned.
The surface finish was excellent, with no chatter marks, but here's the problem, the part grew uniforly by approx .020 in diameter
Does anyone have some suggestions to solve this problem. I'm considering underturning all diameters by .020, but I doubt that I'll be able to hit the numbers.