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).
Specification of inspection and test procedures for a sequence starter motor with a longitudinal damper, version 2.
| Identifier | ExFiles\Box 168a\2\ img031 | |
| Date | 20th March 1931 | |
| X6080 20.3.31. X.6080 R.R. SEQUENCE STARTER MOTOR (WITH LONGITUDINAL DAMPER) X.6088 SPECIFICATION OF INSPECTION AND TEST. VERSION 2. (1) INSPECTION. Inspect the brush mechanism and make sure that - (a) All brushes have the necessary freedom without being unduly slack, (i.e. there should be .003" to .007" clearance between the brush and holder both circumferentially and axially), and that the spring pressures are suitable. The actual pressure exerted by a spring on its brush should be 14 ± 2 ozs. Note. It is possible that a spring which is noticeably weak may be cracked and requires replacing. Test the springs for cracks by forcing these back as far as possible. (b) The lower edges of the brush holders are parallel with the insulation between segments and that the brush springs are clear of the sides of the slots in the brush holders, so that the full tensions of the springs are exerted on their respective brushes. Also make sure that neither the insulation nor the conductors in the brush pigtail connections are in any way damaged. (c) The initial bedding of the brushes shews partial contact reasonably well distributed over the working surface. (d) Ascertain that the teaser, main and switch terminals on the carcase are not loose. Verify tightness of nut and bolt connection of main field winding to brush gear, also that of the nut securing the wire to the fixed insulated contact and of the insulated contact lock-nut. (e) With all brushes lifted, see that the armature revolves and moves endways freely and does not foul the nut and bolt connections on the field coils. Free motion of the armature endways should be checked as lying between the limits .760 and .790. Also the damper motion should be checked by pushing the damper piston against its springs when the motion should be found to be .175 ± .10. | ||