Condux Slip Clutch Capstan - Manual (Page 6)

6
B. RECALIBRATION OR CHANGING CALIBRATION SETTING
NOTICE: If the capstan is field calibrated, Condux assumes no liability
for incorrectly calibrated capstans resulting in damaged cable. If the
factory supplied safety wire has been removed, the capstan will be
considered to have been field calibrated and all warranties, implied,
written or otherwise portrayed are considered null and void.
If the capstan needs to be recalibrated or if a different load is required, the capstan can be
calibrated using the following procedure. Note: dO NOT USE this procedure to verify
calibration (See Previous Section 4A).
1. Set up the capstan on a bayonet shaft as if cable were to be pulled (figure 3).
2. Place a pull line around the capstan. The pull strength of the pull line must exceed the
1,000 pound capacity of the capstan.
3. Attach the pull line to a load indicator such as a Dillion dynamometer (section 6).
4. Cut the cable lanyard from the capstan cap.
5. Use a punch to remove the 1 ⁄
8
inch diameter spring pin from the cap and remove cap.
6. Loosen the two setscrews ( 1 ⁄
8
inch hex) on the shaft lock nut.
7. Rotate the shaft lock nut counterclockwise with a 2 5 ⁄
8
” deep well socket (see section 6)
until there is no pressure on the compression spring washer.
!NOTE: The two setscrews from step 6 must be loosened before rotating the shaft lock nut.
8. Inspect and replace any worn or broken parts.
9. Hand tighten the lock nut back into contact with the compression spring washer.
!NOTE: Ensure the spring washer is centered on the shaft and has not slipped into the
groove in the shaft.
10. Slowly apply pressure to the capstan to tighten the pull line. Continue to pull slowly
until the capstan begins to slip. The value shown on the dynamometer will be the force
at which the capstan is set to slip.
11. Stop the capstan rotation and remove the load from the capstan. Leave pull line in place.
12. Tighten the shaft lock nut 1 ⁄
4
Turn Only with socket.
13. Slowly apply pressure to the capstan to tighten the pull line. Continue to pull slowly
until the capstan begins to slip. The value shown on the dynamometer will be the force
at which the capstan is set to slip.
14. Stop the capstan rotation and remove the load from the capstan. Leave pull line in
place.
15. Repeat the tightening and testing until the correct load is indicated on the
dynamometer.
!NOTE: If the desired load is exceeded, the calibration procedure must be re-started
beginning at step 7. Do not try to simply loosen the nut partially. The nut must be
completely loosed and tightened in 1 ⁄
4
rotation increments or less.
16. When the capstan is calibrated to the desired load, tighten the two setscrews in the
shaft locking nut, replace the capstan cap, lining up the roll pin holes. Drive the roll pin
through the capstan cap and shaft.
17. Perform a final calibration check before removing capstan from shaft and storing.