H8368 Electric Power Drawbar
-3-
4.
Insert the new bolt head into the top of the
spindle, then measure the distance from the
top shoulder of the bolt head to the mounting
surface of the motor assembly (see
Figure
7
).
Figure 7.
New bolt head inserted in the mill for
measurement.
Measure
This
Distance
7.
Press the new bolt head and drawbar shaft
together.
Note:
Make sure not to damage the bolt head
spline or the threaded end of the shaft.
8.
Drill two holes completely through the bolt
head and drawbar shaft to accept a tight fit
from the 4 x 23mm pins, then insert the pins
(see
Figure 9
).
5.
Remove the amount measured in
Step 4
from the
bottom
of the new bolt head (see
Figure 8
).
Note:
The top shoulder of the new bolt
head below the spline must be even with
the mounting surface on the mill to properly
engage with the drawbar motor.
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Figure 8.
Measuring the amount of the new
drawbar head bolt to remove.
6.
Center drill and drill the bottom of the new
bolt head to provide a tight, press-fit 1
3
⁄
4
"
deep hole for the new drawbar shaft.
Note:
It is critical for proper operation of the
power drawbar and mill that the fit of the
drawbar shaft into the bolt head is exactly
centered and press-fit tight.
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Figure 9.
Example of pins securing new drawbar
shaft to the new head bolt.
Installation
1.
Prepare the top of your mill so that the alu-
minum mounting plate of the power drawbar
motor is center-aligned to the spindle.
2.
If the mounting holes in the mounting plate
do not align with threaded holes in the mill to
accept the M6-1 x 25 cap screws, drill new
holes in the mounting plate.
Note:
The power drawbar motor must be
mounted flat with and fully supported by the
mill, exactly centered over the spindle open-
ing.
3.
Insert the new drawbar assembly, then mount
and secure the power drawbar motor to the
mill with the electrical connector facing to the
rear.
4.
Temporarily support the switch assembly,
then connect the switch electrical plug with
the motor electrical plug.