Mini Metal Lathe – BMLAT-07
E&OE
© 2020 Baumr-AG
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5. Retract the tool, using the cross-slide feed handle, noting the exact position on the scale and the exact
number of turns.
Turn the switch (B) to 'REVERSE', the carriage/saddle crank back to the beginning and turn switch (B) to
'OFF'.
Restart the tool by winding IN the cross-slide the exact number of turns previously wound OUT and then
continue to wind IN the to the desired depth of cut.
6. Repeat the step 4 and 5. Proceed in this manner until the thread is completed.
Changing Gears for Screw Cutting
The lead screw is driven via a gear train by a gear on the spindle. The gear ratio will determine the rotational
speed of the lead screw with relation to the spindle, i.e., one turn of the spindle will turn the lead screw 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 lead screw
supplied produces Imperial threads, the known values will be in Threads Per Inch (TIP), or if the lead screw
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:
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