Smithy MIDAS MI-1220 LTD, Operator'S Manual, Page: 22 / 133

Reducing Backlash
Backlash of 0.008-0.015” as measured on the dial is normal. If you have more backlash
than that in your crossfeed table, refer to the schematics at the back of this manual, if
necessary and follow these directions:
1.
Tighten the cap nut in the center of the cross feed hand wheel securely.
2.
Tighten the set screw inside the T-slot so the brass nut cannot move.
3.
Tighten the screw in the base of the brass nut. This will remove play between the
threads in the cross feed screw and nut. Do not over tighten it or there will be excess
wear on the nut.
If there is still excess backlash, place one or more shim washers between the large
shoulder of the cross feed screw and the bush bearing. Ask a Smithy technician about our
antibacklash shim washer kit, Item number K99-190.
Figure 5.13 To reduce backlash, tighten the setscrew so the
bush bearing will be secured.
To install shims, turn the hand wheel clockwise to move the cross table away from the
screw seat. Loosen the setscrew. Then pull out on the hand wheel until the bush bearing
is free of the seat. Remove the cap nut, hand wheel, dial, keys, and bush bearing. Install
one or more shim washers and reassemble.
Running in the MI-1220 LTD
Though all Smithy machines are run at the factory and again before shipping, it is wise
to put your machine through a break-in run before putting it to work. After oiling the
machine, check the belts to make sure the tensioners are correct. Do not plug your
machine yet.
Follow these steps:
Millhead Run-in
1.
Make sure that the power switch for the lathe motor and the mill motor are both in the
off position.
2.
Close the door of the gearbox before starting your machine.
3.
Plug the machine into a grounded 20-amp circuit.
5: Uncrating and Setting Up the MI-1220 LTD
5-8
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