Chapter 20
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 Midas 1220 XL arbour, which has an MT3 taper, is driv-
en 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. (Figure 20.1)
Figure 20.1 The arbor stays in place via a drawbar.
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 (Figure 20.2) or end mill holders (Figure
20.3). Their precision-ground shanks go into the mill spindle. When you tighten a spring
collet, its hole reduces and the collets 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 workpiece, the cutter or you.
Figure 20.2 Spring collets, which fit into the
mill spindle, hold straight-shank end mills.
20-1
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Summary of Contents for Midas 1220 XL
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