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MYFORD QUICK CHANGE GEARBOX
METRIC, B.A., AND ODD THREADS AND PITCHES
of odd threads, metric threads and feeds can be obtained by
using a special slotted quadrant, with standard changewheels
on movable studs, in place of the normal quadrant and gear
train as supplied with the gear box. (See also pages 4 and
5).
Fig. S.
Slatted Quadrant (with movable changewheel studs "exploded" to
show construction).
THE METRIC CONVERSION SET (No. 14811, not 1481)
comprises a slotted quadrant, 12 changewheels, 2 spacers, and 2
movable changewheel studs. This set covers all the pitches shown on
the METRIC CHART which is located inside the hinged gear guard.
Alternatively, the slotted quadrant can be supplied separately, or
with any changewheels, spacers and movable studs which are required
for a particular gear train.
Fig. 6. Metric Chart (located inside the hinged gear guard).
6
Hundreds
MYFORD QUICK CHANGE GEARBOX
CONTROLS
The Myford gear box is designed for smooth and easy
operation. To obtain the various threads and feeds it is only
necessary to arrange the levers of the gear box and the
reversible cluster gear, as indicated on the Chart (6) Fig, 7.
IMPORTANT
The movement of the control levers whilst the lathe is
in motion is only practicable when set for fine feeds.
The lathe speed must be slow and the load light.
Generally it is preferable to stop the lathe and turn
the spindle by hand whilst engaging the gears.
DO NOT USE FORCE.
Care should be taken when No. 1031 MYFORD
spindle nose collets are being used, or when any
other work is being done close to the headstock
spindle nose. Under these conditions the leadscrew
guard and clasp nut lever are both very close to the
gearbox, and serious damage would ensue if the
leadscrew guard were allowed to run into the gearbox.
Fig_ 7.
Quick Change Gear Box Controls. 7
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