Cutting 39 x 4mm Spindle Threads
HF 9 x 20
To cut a 4mm thread you will need to set the lathe up as follows:
A - 80 tooth gear ( will mesh to the 127 tooth gear )
B- 30 tooth gear ( will mesh to the 120 tooth gear
And the quick change gear box is set to position # 1.
The 80 tooth and 120 tooth gear shown in the above pic remain in place.
Note: The extra 80 tooth gear that is included with the 9 x 20 has a shoulder
that does not allow
the circlip to be attached. In other words the 80 tooth gear is too thick ( shown below on left )
I decided to face off the shoulder allowing the 80 tooth gear to be
attached using the circlip
to shaft A in the above pic.
Jeff Davis used the gear "as is" and threaded his back plate by hand power shown here
Steps for making a back plate
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Copyright 2002 Steve Bedair