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G1005Z Mill/Drill
-19-
Graduated Dials
The handwheels and the micro-downfeed adjust-
ment knob have graduated dials. Each mark
represents 0.001" of movement and one full revo
-
lution of the micro-downfeed knob equals
0.100".
The graduated dials float and can be indexed or
"zeroed" using the knurled knob on the dial. One
full revolution of the handwheel equals
0.100".
Backlash
Backlash and graduated dials are somewhat
interconnected. When you change direction of the
table in either axis, you must correct the gradu
-
ated dial for backlash. Normal recommended
backlash is less than 0.010".
Note: It is up to you to determine an acceptable
amount of backlash for your system. The frictional
wear on your lead screw increases as backlash
is reduced. Attempting to completely eliminate
backlash can place excessive wear on your lead
screw and decrease its operational capability
.
To correct for backlash:
1. Turn the handwheel and move the table the
opposite direction of your next operation.
2. Turn the handwheel to move the table in the
intended direction
.
3. The exact moment the lead screw catches
and the table begins to move, backlash has
been eliminated and the graduated dial can
be "zeroed."
Note: You will not need to adjust for back-
lash as long as the table keeps moving in the
same direction.
To engage the micro-downfeed handwheel, tight-
en the pinion hub lock knob clockwise against the
pinion hub
.
To disengage the micro-downfeed handwheel,
hold the downfeed handles and loosen the pinion
hub lock knob counterclockwise.
Micro-Downfeed
Handwheel
The micro-downfeed handwheel (Figure 13) is
used when vertical milling accuracy is required.
Each full rotation of the micro-downfeed handwheel
is equal to
0.100".
Figure 13. Pinion hub lock knob.