-2-
H8368 Electric Power Drawbar
Drawbar Assembly
The goal of these procedures is to fabricate
an entirely new drawbar that will extend down
through the spindle the same length as your mill's
existing drawbar. Also, you must ensure that the
top shoulder of the new bolt head will be flush with
the mounting surface of the motor assembly.
To assemble the drawbar:
1.
Use a caliper to measure the diameter of your
mill's drawbar bolt head (see
Figure 3
).
Figure 3.
Bolt head and drawbar shaft.
Bolt Head
Drawbar Shaft
—
If the diameter of your mill's existing bolt
head is 24mm, then proceed to
Step 2
.
— If the diameter of your mill's existing bolt
head is smaller than 24mm, use a lathe to
turn the new bolt head to match the diam-
eter of the your mill's existing bolt head
(see
A
in
Figure 4
).
Note:
The splines of the new bolt head are
specifically designed to match the socket
of the drawbar motor. DO NOT damage
them.
— If the diameter of your mill's existing bolt
head is larger than 24mm, make a section
that equals the diameter of your mill's bolt
head and attach it to the end of the new
bolt head (see
B
in
Figure 4
).
— If your mill does not allow the bolt head
to be inserted into the spindle cavity, then
you must build a drawbar motor mounting
adapter that will allow only the full spline
to be above the mounting surface (see
Figure 5
).
Note:
Before making any alterations to the
new drawbar, read through the rest of the
instructions to calculate the correct lengths.
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Figure 6.
Calculating the length of the new shaft.
2.
Measure the length of your mill's existing
drawbar from the bottom of the bolt head to
the end of the drawbar shaft, then add 1
1
⁄
2
"
(see
Figure 6
).
Note:
The additional 1
1
⁄
2
" is the amount of the
new shaft that will be inserted into the new
bolt head in a later step.
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Figure 4.
Examples of making the diameter of
the new bolt head equal that of the existing bolt
head.
3.
Remove the necessary amount, if any, from
the top of the new drawbar shaft to make
the total length of the shaft equal to the total
length calculated in
Step 2
.
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Figure 5.
Example a custom drawbar motor
mounting bracket.