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).
Manufacturing, inspection, and erection procedures for gears, with notes on Buick's engineering practices.
| Identifier | ExFiles\Box 178\2\ img178 | |
| Date | 19th February 1934 | |
| -2- (2) Rough cut on a Gould & Eberhardt. This leaves .015 on tooth face each side. (3) Finish cut on Fellows. This found more satisfactory than hobbing. High speed cut used to get clean finish. This is 900 strokes per min. (4) Burn off rough edges left from op. (3) with a gas jet. (5) Inspect. Helix angle must be within 4/10 of a degree (30° helix angle). Eccentricity limit .002. (6) Burnish tooth face on a Pratt & Witney three gear burnisher with a pressure of 10 lbs. Burnishing gear moves sideways 3/16" during this operation. Face of burnishing gear cross-hatched to give a file-like surface which speeds up the operation to about ½ min. Soap water used as cutting fluid. (7) Final inspection; pitch line held within .0005 limit. (8) For production, all gears made the same size; oversize supplied for servicing only. (9) Don't stock gears or blanks. They deteriorate. ERECTION. (1) Crank shaft centre held to .0015 with regard to camshaft centre. (2) Pitch line clearance or back lash between cam wheel and crank pinion rarely less than .0015 or more than .0025. (3) Producing over 400 engines a day, the average engines turned down on unit test for noisy gears is 2%. It is unusual for an engine to be turned down on road test for a noisy gear. GENERAL POSITION - BUICKS. They are probably the most conservative of G.M. companies. They are still supporters of the straight eight. They still use cast-iron pistons and white metal bearings. They do not like the double plate clutch and will revert to the single plate as soon as they can. | ||