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).
The features and operation of a Builders Small Arms Rifling Machine.
| Identifier | ExFiles\Box 176\3\ img169 | |
| Date | 9th October 1940 guessed | |
| B BUILDERS SMALL ARMS RIFLING MACHINE The new Builders Small Arms Rifling Machine is a ruggedly constructed, up-to-date machine tool designed to meet the requirements of modern production methods with accuracy and economy. Skillfully engineered and designed in the light of modern practice, it embodies all of the latest features, principles and improvements. Held firmly in a three-jaw chuck, the work remains stationary while the tool reciprocates, passing through the work on the forward stroke and cutting it on its return stroke. The cutter, supported by a stationary rest, is held in an adaptor which rotates as the carriage moves longitudinally, the amount of rotation being determined by the position of the sine bar guide which can be set at any desired angle to give the proper rifling pitch. At the end of the forward stroke, a plunger which engages an index plate having a specified number of notches corresponding to the number of grooves to be rifled, is automatically released and, by means of a cam, rack and gear arrangement, the work spindle is rotated until the plunger drops into the next succeeding notch in the index plate. | ||