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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 to High Duty Alloys Ltd. concerning the extrusion of AC.7 bearing alloy and proposing tube dimensions.

Identifier  ExFiles\Box 116\2\  scan0070
Date  2nd February 1938
  
1020a

Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews}6/MH.{M. Huckerby}

2nd. February 1938.

Messrs. High Duty Alloys Ltd.,
Buckingham Avenue,
Trading Estate,
Slough,
BUCKS.

Your Ref: WEP/AMH.

Dear Sirs,

We thank you for your letter of the 28th. ult. referring to extruded AC.7 bearing alloy and would point out that there may be a certain amount of danger attached to this process if carried out at a temperature of 250°C or above due to the presence of low melting temperature constituent. There is a danger of course, of the tin being in a molten state and if extrusion is carried out whilst the material is in this state it may cause injuries to the operators. If, however, you consider there is no danger then we think material in the form of a tube would be a better proposition since it would require less machining. Four our own use a tube to the following dimensions would be suit-able.

Connecting Rod bearings.
1.700 inside dia. x 2.800 outside dia.

Main bearings.
1.900 inside dia. x 3.200 outisde dia.

or alternatively a tube to the following dimensions which would make both bearings -

1.700 inside dia. x 3.200 outside dia.

We shall be pleased to hear the results of your experi-ments if you decide to carry on with this process.
Yours faithfully,

for ROLLS-ROYCE LTD.
  
  


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