Smithy MIDAS MI-1220 LTD, Operator'S Manual, Page: 48 / 133

• When installing the chuck jaws on a three-jaw chuck, install them in numerical order
and counterclockwise rotation.
Each jaw is stamped with a serial number and jaw number (#1, #2, or #3). The slots in
the chuck are not numbered, but there is a serial number stamped at the #1 slot (Figure
10.20). With the #1 slot in the 12:00 position, the #2 slot is at 8:00 and the #3 slot at
4:00 (Figure 10.21).
To install the jaws, first insert the #1 jaw into the #1 slot and turn the key until it
engages. Then put in the #2 jaw and engage it, then the #3 jaw.
Figure 10.20 A serial number is stamped in the #1 slot of the three-jaw chuck.
Figure 10.21 With the slot for the #1 jaw in the 12:00 position,
the slot for the #2 jaw is at 8:00 and the slot for the #3 jaw is at 4:00.
Collets and Collet Attachments
To hold small-diameter work, whether bar stock fed through the hole in the spindle or
small pieces of semi finished parts, collet attachments are preferable to standard chucks
(Figure 10.22) for several reasons:
• They have much faster release and grip actions.
• They center the work automatically and accurately
• They grip even small pieces and pieces with a short hold firmly.
Slot #1
Slot #2
Slot #3
10: Setting Up with Centers, Collets, and Chucks
10-10
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