The crank was mounted on four jaw chuck of lathe and centred.
四ツ爪にくわえてセンター出し。
Grab screw thread was cut.
固定イモネジ用のM3タップを当てる。
The crank was attached to a fixture.
クランクをヤトイに取り付ける。
The crank arm was rounded with fixture.
腕端部のR削り。
Hole pitch accuracy was checked. They seemed OK. This time I used DRO for hole location positioning and it would be much accurate than table dials I used for ERIC.