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R-8 Collet
Installation &
Removal
If you do not use the drill chuck and arbor, you
need to use a collet to insert the cutting tool into
the spindle. Your Model G0720R features an R-8
spindle taper, which gives the freedom to use
common R-8 collets. These optional collets come
in many sizes, typically ranging from
and 3mm to 20mm, and should be matched to
your cutting tool shank size.
Installation
1.
DISCONNECT MILL FROM POWER!
2.
Unscrew the drawbar cap.
3.
Carefully clean the surface of the collet and
spindle taper. Ensure that it is free of debris
and is lightly oiled.
4.
Insert the cutting tool into the collet, then
insert the collet into the spindle taper.
5.
Rotate the collet so it engages the align-
ment pin inside of the spindle, then slide the
collet upward until it makes contact with the
drawbar threads.
6.
Thread the drawbar into the collet until the
collet draws up into the spindle taper.
7.
While supporting the tool in the collet with
one hand, snug the drawbar with the drawbar
hex wrench in your opposite hand.
Note: Do not overtighten the drawbar.
Overtightening makes collet removal difficult
and will damage the drawbar threads, collet,
and the spindle taper. Keep in mind that the
taper keeps the collet and tool in place. The
drawbar simply aids in seating the taper.
Model G0720R (Mfg. Since 11/10)
Removal
1.
DISCONNECT MILL FROM POWER!
2.
Tighten the headstock lock.
⁄
" to
⁄
"
1
7
16
8
3.
Protect the table surface with a piece of card-
board or hold the cutter/tool with a shop towel
to prevent it from falling out of the collet.
4.
Using the drawbar hex wrench, loosen the
drawbar two turns, but DO NOT remove it.
DO NOT completely unscrew the drawbar
before tapping it with the hammer in the
next Step. You will damage the threads on
the drawbar and the arbor.
5.
Put on safety goggles, and tap the hex
wrench to unseat the collet from the taper.
6.
Unscrew the rest of the drawbar and allow
the collet and tool to fall into your hand.
Note: When not in use, always remove
collets and cutting tools from the spindle
taper. Oxidation may cause the collet to seize
and make it hard to remove later.
LACERATION
HAZARD!
Leading edges of end mills
and other cutting tools can
be very sharp. Protect your
hands with gloves or a shop
towel when handling.
NOTICE
-23-
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