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The cylinder pivot was made from a silver steel rod of 4mm diameter.
Click for larger drawing It was machined to ensure that there was a square shoulder at the root of the M3 thread. This would help the pin to pull square to the cylinder port face when tightened. |
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A piece of silver steel was cut just over length and the ends were squared off in the lathe. Next a sharp pointed tool was used to turn a section of the shaft to 3mm diameter. This reduced section was made longer than would be finally needed to aid the threading process. |
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To cut the thread the tailstock was used to assist the threading process. The tailstock chuck was used to keep the die square to the work and apply a light force. The tool post was positioned to stop the die holder rotating and then the chuck was turned by hand to cut the thread up to the shoulder. |
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Next, a very sharp tool was used to square off the bottom of the thread. Then the thread was turned to final length using the cylinder tapped hole as a guide. Finally an M4 thread was added to the other end of the pin using the same threading technique. |
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