Smithy Midas 1220 LTD - Manual (Page 80)

Push the mil head in the desired direction. Lock the main and centering locks to hold the
head into position
To recenter the mill head, push the head into the approximate centered position. Move
the head back and fourth slightly while tightening the centering lock. The head will work
its way into the centered position.
The mill head may be raised to accomodate larger work pieces. Unlock both locks and
slide the crank handle over the square ended shaft on the front of the mill head. Crank
to the desired height and lock into position.
Holding Milling Cutters
There are several ways to hold milling cutters - in arbors, with collets and special
holders, and in adapters.
Figure 17.2 MI-1220 LTD milling attachments
Arbors
Arbors come in different sizes and lengths, with one end tapered to fit the bore in the
end of the machine spindle. The arbor of theCB1220 XL LTD, which has an MT3 taper, is
driven by the friction between the arbor and spindle. The arbor stays in place by means
of a drawbar screwed into the end of the arbor from the top of the spindle.
Take good care of your arbors. Store them in a rack or bin. If you won't be using them
for several days or longer, oil them to prevent rusting, especially in damp weather.
Collets and Holders
Straight-shank end mills fit into spring collets or end mill holders. Their precision-ground
shanks go into the mill spindle. When you tighten a spring collet, its hole reduces in size
and the collet grips the end mill shank evenly. Tighten the end mill securely with the
setscrew against the flat surface of the end mill, or it may slip out and damage the
workpiece, the cutter, or you.
Drawbar
Arbor attaches to the
drawbar inside the
drawbar
Midas 1220 LTD Operator’s Manual
17-2
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