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Mark 5XL Technical
Notes |
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Cheater Preload
Adjustments
1. Allen wrench
socket
2. 7/16 Hex Nut
3. Thread
Friction Preload |
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There must be slight friction on the
cheater shaft thread, because the shaft moves with the motion of the index
lever. The cheater knob should be slightly difficult to turn. If it drifts
in use, indexing will be unreliable. The nylon tipped set screw, 3 in the
above picture, acts as a brake on the threads and may be adjusted if needed.
Cross shaft preload adjustment will
probably never need to be done, as this preload is on ball bearings. It is
easily accomplished with an allen wrench inserted into the socket (1) to
immobilize the shaft, while the adjustment is made by turning the 7/16
Nylock hext nut (2).
The critical test is with the latch fully
engaged in an index gear tooth, when applying back and forth torque to the
index gear, there should be NO detectable play of slop. |
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Electronic Calibration |
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The units are shipped in calibration and tested at 0°,
30°, 45°, 60°, and 90°.
Due to internal construction details of the
sensor, at true 0°, the meter should read "00.04" to "00.17". Of course,
no cutting should ever be done with the arm in the 0° position. Use your
table adaptor!
Units are locked permanently with a
drilled-in-place dowel pin. Unless the unit has been subjected to very
severe shock and vibration, there should never be any need to touch this
adjustment!
This is a sensitive adjustment. We store a
calibration reference for each head that, under very rare
circumstances, can be adjusted in the field. |
Micrometer Tension
Adjustment
The micrometer must not
rotate as the head is swung in and out to inspect the stone, or the height
adjustment might change. Adjustment of the micrometer head friction screw is
simple.
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Unscrew the micrometer
head to expose the adjusting nut. Depending on the micrometer, the
adjustment nut may have notches or holes to engage the spanner wrench
(supplied with the machine). |
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Tighten the nut a small
amount, perhaps only 1/8 of a turn and screw in the micrometer head and see
how you like the stiffness. Repeat as needed until the micrometer head
requires a slight effort to rotate it. |
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Shipping Notes:
Never ship the unit with the coarse angle
clamp locked. The XL5 is a rugged machine, but what goes on behind the closed
doors of the major shipping companies boggles the mind! Block the head with a
piece of semi-rigid foam at about the 90° position.
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