9
PM 25MV v9 2021-12
Copyright © 2021 Quality Machine Tools, LLC
Two tools are required to install or remove R8 tooling:
an 8 mm wrench for the square drawbar nut, and the
supplied C-wrench which engages in flats at the bottom
end of the spindle.
Install tooling
Install the R-8 device, then hand-thread the drawbar
into it until the shoulder on the drawbar bottoms on the
splined spindle, diagram above (on the machine this is
concealed by the drawbar cap, Figure 3-2). Lock the
spindle with the special C-wrench, page 5, while at the
same fully tightening the drawbar with an 8 mm wrench.
[Do
NOT
try to lock the spindle using the flats on the
drawbar cap; this is screwed onto the spindle to secure
the return spring cup.]
Figure 3-2
Two-step belt drive
Figure 3-3
Collet set screw
Remove tooling
Protect the table, vise or workpiece under the spindle
with rags or scrap wood.
Why?
Because they can easily
be damaged by falling tools and drill chucks. The cutting
tool itself can also be damaged in the same way.
Lock the spindle with the C-wrench, loosen the drawbar
one half turn or less, just enough to unseat the taper,
then tap the top of the drawbar with a brass or dead-
blow hammer to. Unscrew the drawbar with one hand
while supporting the R-8 device with the other hand.
R8 tooling is located in the spindle bore by a set screw. If
it is difficult or impossible to insert the R8 device, chances
are the set screw is in too far. Rotate the spindle by hand
to expose the screw, Figure 3-3, then back it out a fraction
of a turn using a 2.5 mm hex wrench.
Hand rotate the spindle again to check that the screw
clears the inside surface of the quill.
INSTALLING AND REMOVING TOOLING
The spindle and drawbar are designed for R-8 taper
collets, drill chucks and other arbors with the standard
7/16”-20 internal thread.
Replace the drawbar cap to
protect bearings and splines.
