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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).
Correct manufacturing process for 'L' shape piston rings.

Identifier  ExFiles\Box 87\2\  scan0228
Date  26th August 1936
  
BY/OC. [crossed out]
G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Sect. [crossed out]
G.{Mr Griffiths - Chief Accountant / Mr Gnapp} C. O.{Mr Oldham} [crossed out]
c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
L236 [handwritten]
BY.6/G.26.8.36.

'L' SHAPE PISTON RINGS.

It is of the utmost importance when producing 'L' shape rings to finish grind the rings before the 'L' formation at the back. If the ring is produced in an 'L' shape, and then ground, its qualities as a scraper ring are negligible.

The D.O. should add a note to the drawing to the effect that when producing these rings they must be ground with the rectangular section formed and the 'L' shape produced by turning after grinding i.e. the formation of the 'L' is to be the last operation.

By [handwritten]

BY.{R.W. Bailey - Chief Engineer}
  
  


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