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End Gears
the end gears must be correctly setup for power
feed, inch, or metric threading operations. use the
photo below to identify the upper "a" gear, middle
120t/127t change gears, and lower "b" gear,
which are also referenced on the headstock feed
and threading charts.
the following subsections explain how to config-
ure the end gears.
upper "a" gear
120t Change
gear
figure 72. Change gear identification.
power feed configuration
install either a 60t or 30t gear in the upper "a"
position and mesh it with the 120t gear. gear
selection depends upon which feed speed is
selected. install another 60t gear in the bottom
position, and mesh it with the 120t gear.
"a "
position
120t gear
60t gear
Bottom position
figure 73. power feed chart change gears.
Model G0750G (Mfg. Since 11/12)
127t Change
gear
Lower "b"
gear
Inch Threading configuration
A change gear corresponding to the "b" row on
the chart is installed in the lower "b" position so it
meshes with the 120t gear. A change gear cor-
responding to the "a" row is installed in the upper
"a" position and meshes with the 120t gear, as
shown below.
"a "
position
120t gear
"a" row
"b" row
"b "
position
figure 74. inch feed chart change gears.
Metric Threading configuration
A change gear corresponding to the "b" row on
the chart is installed in the lower "b" position so it
meshes with the inner 120t gear. A change gear
corresponding to the "a" row is installed in the "a"
position so it meshes with the outer 127t gear, as
shown below.
"a "
position
120t gear
"a" row
"b" row
position
figure 75. Metric feed chart change gears.
"b "
127t gear
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