Cutters are held firmly on
milling machine with the help of arbors and adaptors.
Arbors
The arbors used on milling
machine are of two types. These are standard arbor and stub arbor. The standard
arbor is relatively larger than the stub arbor. Standard arbor is provided with
spacing collars which help in adjusting the position of the cutter or the
distance between the cutters when two or more cutters are used simultaneously.
Few collars are of relatively larger diameter are also supplied which acts as
bearing sleeves when the arbor is supported by arbor supports.
 |
| Standard and Stub Arbor |
Adopters
Many cutters such as shell end
mill, t-slot cutter, woodruff key seat cutter, etc carry tapered shank. If the
size of these shanks is smaller than that of the hole in spindle nose, adaptors
are used. The external taper of these adaptors corresponds to spindle taper and
internal taper to the cutter to be held. Milling cutters which carry straight
shank are held in collet chuck or collet adaptor carrying spring collet.
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