You will use arbor spacing collars of various
lengths to position and secure the cutter on the arbor.
Tighten the spacers against the cutter when you
tighten the nut on the arbor. Remember, never tighten
or loosen the arbor nut unless the arbor support is in
place.
Shell End Arbor
or on the tapered portion of the arbor. The first
Shell end mill arbors (fig. 749) are used to hold and
number of the code identifies the diameter of the
drive shell end mills. The shell end mill is fitted over the
taper. The second (and if used, the third number)
short boss on the arbor shaft. It is driven by two keys
identifies the diameter of the arbor shaft. The letter
and is held against the face of the arbor by a bolt. Use a
identifies the type of bearing. The numbers following
the letter identifies the usable length of the arbor
loosen the bolt. Shell end mill arbors are identified by a
shaft. Sometimes an additional number is used to
code similar to the standard arbor code. The letter C
identify the size of the sleeve-type bearings. The
identifies a shell end mill arbor. A typical shell mill
meaning of a typical code number 5-1-A-18-4 is as
arbor code 4-1-C-7/8 is identified as follows:
follows:
4 = taper code number--40
5 = taper number--50 (the 0 is omitted in the
1 = diameter of mounting hole in end
code)
mill--1 inches
1 = shaft diameter--1 inches
C = style C arbor--shell end mill
A = style A bearing--pilot type
7/8 = length of shaft--7/8 inch
18 = usable shaft length--18 inches
4 = bearing size--2 1/8 inches diameter
Fly Cutter Arbor
Fly cutter arbors are used to hold single-point
Stub Arbor
cutters. These cutters (fig. 7-45) can be ground to any
desired shape and held in the arbor by a locknut. Fly
cutter arbor shanks may have a standard milling
Arbors that have very short shafts, such as the one
machine spindle taper, a Brown and Sharpe taper, or a
Morse taper.
arbors when it is impractical to use a longer arbor.
Screw Slotting Cutter Arbor
Screw slotting cutter arbors are used with screw
slotting cutters. The flanges support the cutter and
prevent it from flexing. The shanks on screw slotting
cutter arbors may be straight or tapered, as shown in
Figure 7-50.--Strew slotting cutter arbor.
Figure 7-49.--Shell end mill arbor.
7-28