4. Push upper spring collet [67-2] into torsion assembly body [61] and lock it with hex
set screw [81-B] in a position so that dial zero aligns with the hairline.
5. Check calibration as described in Section 3D above. If still incorrect, repeat this
section.
F. Re-assembly of the Torsion Shaft Assembly into the Rheometer.
1. Loosen and rotate the hairline/magnifier out of the way of removing the Torsion
Shaft Assembly.
2. Unscrew the Calibration spool [5] and the thread [6] and remove them.
3. Remove screw [79], then remove dial [60].
4. Loosen and remove the lock bar [4] holding the Torsion Body, then lift the Torsion
Body out of the Calibration Fixture.
5. Place the Torsion Shaft Assembly in the Rheometer with the flat on the Torsion
Body toward the crank end of the rheometer, then install the retainer on top of the
Torsion Body.
6. Assemble the dial [60] and secure with screw [79].
7. Temporally place the cover, with the hairline jewel in it, in place and observe the
position of the hairline with relation to the "0" on the dial, then remove the cover
and adjust the two zeroing screws against the flat on the torsion body to slightly
rotate the torsion body as needed to align the "0" with the hairline. Recheck using
the cover and repeat if necessary. Both zero adjust screws should be tight against
the torsion body.
8. Place cover in place and install the four 6-32 x 1/4 long cover to frame screws.
9. Position shift arm in the STIR position, then install the shift arm, cam, and bearing
onto the shift rod. Move shift arm to the 300 RPM position.
10. Turn crank forward while holding rotor from turning, screwing it into place and
tighten.
11. Screw Gel Knob onto speed shaft as far as the hex set screw will allow. Use hex
key wrench and holding Gel Knob tighten the hex set screw. Test the operation of
the rheometer at 600 RPM and adjust the speed to 600 +/-3 RPM. If the
rheometer is running too slow loosen the set screw 1/4 turn, then screw the Gel
knob 1/4 turn further on. Re-tighten the set screw and retest. If the Rheometer is
running too fast, loosen the Gel knob using the above procedure.
12. When the 600 RPM speed is properly set, install the flat head cover screw.
13. Assemble the Dust Shield and the Bob onto the Bob Shaft, then screw the Sleeve
onto the Rotor.
NOTE: This spring calibration should be verified after assembly of unit in silicone
calibration fluid.
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