18
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Before changing Gears, the Lathe must be set to the “OFF”
position and the power cord unplugged from the receptacle.
Remove the gear train cover which is secured with two socket head cap screws
(FIG 17)
.
Gear
A
may be considered as the Driving Gear, and Gear
D
as the Driven Gear.
When a simple gear train is configured, as illustrated in
(FIG 15)
, Gear
B
acts as an
Idler and its size is therefore irrelevant - any gear that fits will suffice to connect Gears
A
and
D
. This is denoted by a blank space in the column in the gear chart.
The positions of the shafts carrying gears
A
and
D
are fixed, therefore all adjustments
are carried out on the shaft carrying gears
B
and
C
and the Adjuster
‘A’
,
(FIG 18)
.
To change Gears:
1.
Loosen and remove the socket head cap screws securing Gears
A
and
D
followed by the socket head cap screw securing Gears
B
and
C
.
2.
To remove lash and allow Gears
B
and
C
to disengage completely and provide
easier re-assembly, loosen and remove the nut retaining the Shaft carrying
Gears
B
and
C
, and the nut retaining the Adjuster
‘A’
(FIG 18)
.
3.
Carefully remove the Gears, taking care not to dislodge the small Keys on each
shaft.
4.
Install the Gears as determined by the requirements of the desired screw
thread.
NOTE:
The number of teeth is clearly molded in the face of each gear.
5.
Replace the retaining screws and washers making sure the washer is fully
against the hub of each gear without binding.
NOTE:
If a compound Gear Train
is required
(FIG 19)
(Gears in two planes) make sure the Spacer, which is keyed
to the shaft carrying Gear
D
, is located on the shaft
BEFORE
the Gear. This is
necessary to align Gear
D
with Gear
C
.
6.
Test rotate the shaft carrying Gears
B
and
C
and the Adjuster
‘A’
so that all
Gears mesh correctly, then tighten the Adjuster retaining nuts. This may require
several repeated attempts however it is important to produce as little backlash
as possible without binding (turn the spindle by hand while checking backlash).
7.
Replace the Gear Train Cover and secure with the two socket head cap screws.
FIG. 17
FIG. 18
FIG. 19
✓
✓
✓
✓
✓
✓
✓
A
B
C
D
Adjuster ‘A’
