From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Testing procedures for a motor's armature, pinion, insulation, and brushes.
| Identifier | ExFiles\Box 168a\2\ img032 | |
| Date | 20th March 1931 guessed | |
| -2- (f) Verify that the armature operated switch makes contact over the last .200 ± .015 of armature motion, if necessary adjusting the maximum value of the contact gap to give this condition. The resulting value of the contact gap ought to be .040 ± .010. (g) By placing the motor with its axis vertical and pinion uppermost verify that the set of the pinion spring is such that the initial load applied to the pinion to begin to move this from its outermost position does not exceed 3 lbs. If the necessary load is found to exceed this value an alteration to the pinion spring shall be made. Also, with the motor axis horizontal, verify that the pinion spring returns the pinion satisfactorily to its normal position without any signs of undue friction on the splines after the pinion has been pushed in to its full extent. (2) INSULATION TEST. Lift the two pairs of earthed brushes and test the insulation of the machine (i.e. all windings etc. together) which should not be less than 1 megohm. A test should also be made of the insulated terminal and switch contact with the armature in the out of gear position in which the contact gap is open. (3) BRUSH BEDDING. The brushes should now be suitably bedded to the commutator, or inspected for O.K. bedding if such has already been performed. | ||