Φ34.30mm ,0.8mm thick flat sapphire crystal will be fitted.
At first I cut the beveled step of circumference on the lathe.
On the milling machine, I opened 6 holes for M1.4 micro screws. And Φ2.0 countersink for screw head. The angles between the holes are 36 and 72 degrees.
Because there is just a step, I had to cut slowly.
The caseback was completed well.
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