Smithy Midas 1220 LTD - Manual (Page 52)

Figuere 10.18 For short, small-diameter workpieces,
insert the jaws with high ends to the center.
Figure 10.19 For large-diameter workpieces
insert the jaws
with high steps of the jaws to the outside.
Caution
Never leave the chuck key (wrench) in the chuck while the chuck is on the spindle. Any
movement of the spindle can crash the key into the ways, seriously damaging the ways,
spindle, and chuck. Turning on the lathe with the key in the chuck can seriously damage your
lathe. The key can also be thrown when the lathe starts, causing damage and/or injury. Never
let your hand leave the chuck key unless you are picking it up or storing it.
Never remove a chuck or heavy faceplate without first laying a board across the ways to
protect them in case the chuck falls when it comes off the spindle nose. Or use a chuck
cradle to ease chuck removal and installation.
Mounting Work in a Three-jaw Universal Chuck
Work is set up in a three-jaw universal chuck as in a four-jaw independent chuck, with
these exceptions:
• On three-jaw chucks, the key moves all the jaws at once.
• You need not center or check for concentricity because these chucks center
automatically.
• Jaws are not reversible. Each chuck comes with two sets of jaws. One is for setups with
high steps toward the inside (inside jaws), the other for mounting in the chuck with high
steps to the outside (outside jaws).
Midas 1220 LTD Operator’s Manual
10-9
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