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13. Threading Dial Indicator
A. Whitworth threads
Located on right-hand side of the apron on lathes having an Imperial
leadscrew. Engage the indicator pinion with the leadscrew and tighten the
hand nut to retain indicator in engagement.
To cut threads of an even number per inch, close the leadscrew nut as
ANY line on the dial passes the datum mark. To cut threads of odd
numbers per inch, close the leadscrew nut at any NUMBERED line.
Fractional threads of 1/2 or 1/4 T.P.I. may be cut by closing the nut at
the SAME numbered line on each pass of the tool.
This dial cannot be used with an Imperial leadscrew to cut metric
threads, or fractional threads. For these the leadscrew nut must be kept
closed and the machine reversed by use of the changeover switch, after
each cutting pass and tool with drawl.
Leadscrew Pitch 4T.P.I
Leadscrew Pitch 6mm
Fig.12
Instructions Manual for CL-38 (L190)
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