E&OE
© 2020 Baumr-AG
37
Changing Gears for Screw Cutting
The leadscrew is driven, via a gear train, by a gear on the spindle. The gear ratio will therefore determine the
rotational speed of the leadscrew with relation to the spindle. i.e. one turn of the spindle will turn the leadscrew
an amount determined by the gear ratio.
By setting the gears to a known ratio, we can therefore produce threads to a known size, and as the leadscrew
supplied produces Imperial threads, the known values will be in Threads Per Inch (TPI), or if the leadscrew
supplied produces Metric threads, the known values will be in mm pitch.
As previously mentioned, the actual thread produced will be totally dependent upon the profile of the cutting tool.
It is not within the scope of this manual to provide detailed information regarding types of cutting tool, cutting
speeds and working with various types of material etc., and it is strongly advised that you consult appropriate
handbooks or seek advice from a qualified person.
The chart below shows the thread sizes that may be cut using the gear configuration shown in the corresponding
columns.
NOTE
: The factory setup for the lathe provides for normal turning using the power or auto feed, and the gear
configuration is as follows:
