Smithy Midas 1220 XL - Manual (Page 32)

Tailstock gib. The tailstock gib also has two adjusting screws (Figure 6.14). This gib can
be free than the others so it is easier to position the tailstock. Again, the lock acts on the
gibs. When tightened, it automatically brings the tailstock into alignment.
Figure 6.12 You can adjust the tailstock gibs with two scetscrews, one on each side
of the tailstock.
Reducing Backlash
Backlash of 0.008 – 0.015” as measured on the micrometer dials is normal. If you have
more backlash than that, refer to the schematics at the back of this manual, if necessary,
and follow these directions:
Crossfeed
1.
Tighten the setscrew on the bottom of the screw seat so the bushing inside the screw
seat can not move.
2.
Tighten the cap nut so the handwheel is secure.
3.
Turn the handwheel one way, then the other. If a gap opens and closes between the
dial and screw seat, you must install one or more shim washers (ask a Smithy technician
about our antibacklash shim washer kit # K99-190)
To install shims, remove the handwheel, key, washer and the outer part of the dial and
spring. Remove the inner hub of the dial. Install one or more shim washers between the
bearing and the dial hub (Figure 6.13) and reassemble. Tighten the setscrew on the
bottom of the screwseat as well.
Figure 6.13 You can reduce handwheel backlash with a shim (left) or by tightening the
setscrew on the bottom of the screwseat (right). This locks the bush bearing
holds the screw and reduces any backlash.
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Midas 1220 XL Operator’s Manual