-34-
Model M1112 (For Machines Mfd. Since 12/20)
O
PE
R
ATIO
NS
4.
In the “Combination of Gears” column (
Figure
49)
are 3 small columns. The numbers below
F
and
G
represent the number of gear teeth on a change
gear. Find the required change gears that have the
corresponding number of teeth as stated in the chart
to the left of the desired pitch.
5.
Open the gear and belt cover.
6.
Loosen the 17mm arm-support hex nut and rotate
the bracket so the middle gear moves away from
gear
F
(
Figure
49).
7.
Loosen the 17mm gear-support hex nut and slide the
middle gear away from gear
G
.
8.
Use a 3mm hex wrench and remove the cap screw
and remove change gear
F
.
9.
Use a 5mm hex wrench to loosen the set screw in
the hub of gear
G
, and pull the gear off of the shaft.
10.
Replace change gears
F
and
G
with the gears that
will produce your desired metric thread pitch and
tighten the fasteners to hold the gears on the shafts.
11.
Slide the appropriate middle gear against gear
G
until they mesh with (0.002" to 0.004" backlash) and
tighten the cap screw.
12.
Rotate the appropriate middle gear against gear
F
until they mesh with (0.002" to 0.004" backlash) and
tighten the cap screw.
Example:
If the desired metric pitch is 1.25mm, move the quick
change levers to positions
1
and
C
. The "Combination
of Gears" column shows that the
F
position change gear
needs 50 teeth and the
G
position change gear needs 60
teeth (
Figure
49). A diagram on the left side of the chart
shows that the 50 tooth change gear meshes with the 91
tooth middle gear and the 60 tooth change gear meshes
with the 86 tooth middle gear.
Remember, you cannot use the thread dial for the metric
threads. You must keep the half-nut lever engaged
throughout the whole threading process until the threads
are complete.
5mm
Hex
Socket
17mm
Arm-Support
Hex Nut
3mm
Hex
Socket
17mm
Gear-Support
Hex Nut
Figure
49. Metric thread chart and change
gear placement.
