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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).
Letter from Adamant Engineering Company regarding Cam and Roller drawings and backlash.

Identifier  ExFiles\Box 153\2\  scan0178
Date  14th November 1936
  
Telegrams: “ADAMANT, Phone, Luton.”
CONTRACTORS TO H.M. ADMIRALTY, WAR OFFICE & AIR MINISTRY.
AD FORM 93.
Telephone: LUTON 2662 (3 Lines).
13001
ADAMANT ENGINEERING COMPANY, LIMITED
(Incorporating J.{Mr Johnson W.M.} C. THREADGOLD & SONS. Established 1878.)
Engineers and Founders.
SPECIALISTS in the DESIGN and MANUFACTURE of HIGH PRECISION TOOLS, JIGS, FIXTURES, etc.
SPECIAL MACHINES, SPECIAL MACHINE TOOLS and ACCURATE PRODUCTION WORK.
SOLE MANUFACTURERS and SALES AGENTS for the MARLES and MARLES-WELLER STEERING GEARS.
Directors:
S. CARLTON SMITH, A.M.I.MECH.E., M.I.P.E.
F.{Mr Friese} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} MATRAVERS, M.A. (CANTAB), A.M.I.MECH.E., A.M.I.E.E., M.I.A.E., M.I.P.E.
O.{Mr Oldham} CARLTON SMITH, M.A. (CANTAB), F.I.S.A., M.I.P.E., Secretary.
A.{Mr Adams} ED{J. L. Edwards} SLATTER, M.I.E.E.
J.{Mr Johnson W.M.} HAZEL, F.I.S.A.
Your Ref.
Our Ref. FGM/IFW.
Head Offices, Works and Design Dept. :
DALLOW ROAD, LUTON.
Messrs. Rolls-Royce, Limited,
DERBY.
Saturday,
14th November,
1936.
For the attention of Mr. Hardy, Experimental Department.
Dear Sirs,
We would refer to the visit of your Mr. Hardy yesterday and, as requested, have pleasure in enclosing herewith the following five drawings.
M.22166, M.22167, M.22168, M.22313 and M.22314.
With regard to the backlash between the outside of the Roller and the Cam Track on the .7 lead Cam, which was referred to yesterday, we have now gone further into this and find that in the latest type of Cam and Roller this backlash is identical with that on the Phantom III.
There is not, therefore, any necessity to make out a new Drawing for the Roller as requested by you.
We would also confirm your Mr. Hardy's instructions to make two Cams the same as the latest 25/30 HP. Cams, but left hand instead of right hand. This is receiving our attention.
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