CHESTER Crusader VS, Руководство по эксплуатации

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selector at the headstock. There are 31 thread pitches in imperial and 26 metric
pitches which can be obtained by turning the feed selector handles.
A. Thread Dial Indicator
The thread dial indicator is installed on the right hand side of the apron. The indicator
is used for thread cutting to engage with the leadscrew.
To reduce the amount of wear on the thread dial indicator, the unit should be
disengaged by the swinging the pinion out of mesh with the lead screw when not in
use.
For these threads it is recommended that the thread dial indicator be used as this
allows the half nut of the leadscrew to be engaged at the end of the end of each thread
cutting pass, provided that they are re-engaged in accordance with the indicator table
mounted in front and down of the change gear box.
In column 1: millimeter pitches to be cut.
27T, 28T, 30T: The number of teeth in “pitch-off gear” arranged to mesh with the
leadscrew (this being selected from the stack, stored on the bottom of the dial spindle).
Dial graduation:
The dial numbers at which the half nut may be engaged under numbers of teeth of
pick-off gear.
Metric leadscrew machines (Metric thread only), the table shows:
Imperial leadscrew machines (imperial thread only), the table shows: