A common catch box consists of a cardboard or wooden box eight to ten
inches square with four- to six-inch high sides. Rags loosely thrown in the
bottom of the box provide padding for the tool to land in when the drawbar is
removed from the fixture and the fixture falls from the mill spindle.
Holding Milling Cutters
There are several ways to hold milling cutters: in arbors, with collets and
special holders, and in adapters.
Arbors
Arbors come in different sizes and lengths, with one end tapered to fit the
bore in the end of the machine spindle. The MI-409MZmill arbor, which has
an MT4 taper, is driven by 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 and the collet grips the end of 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 work piece, the
cutter or you.
Adapters
Adapters mount various types and sizes of cutters on the spindle. Arbor
adapters mount face mills on the spindle. Collet adapters mount end mills on
the spindle. Taper-shank end mills mount in adapters that have holes with
matching tapers. If the taper shank on the tool is smaller than the hole in the
adapter, put a reducing sleeve into the adapter. Shell end mill adapters come
in different sizes to accept different sized shell end mills.
To remove arbors or adapters held with a drawbar, follow these steps:
1. Loosen the locknut on the drawbar about two turns.
2. Hit the end of the drawbar with a dead-blow hammer, releasing the arbor
or adapter from the spindle hole.
3. Hold the arbor or adapter so it won’t fall out of the spindle when the
drawbar is removed.
4. Unscrew the drawbar and remove the arbor or adapter.
5. Your machine includes a tapered drift for removing tapers. Follow these
steps:
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