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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).
Issues and alternative methods for fixing Marles steering cams to tubes.

Identifier  ExFiles\Box 153\2\  scan0153
Date  30th October 1936
  
JT300

To RHC.{R. H. Coverley - Production Engineer}

Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}14/JH.30.10.36.

Marles Steering.

The Works are finding that the present method of fixing steering cams to their tubes is unsatisfactory owing to inaccuracies in the broached hole in the cam. We have taken the matter up with the Adamant Engineering Co. but they say that they cannot improve on their present standard.

The attached Rm.{William Robotham - Chief Engineer}248 shows a modified method of attaching the cam which allows of grinding the cam bore where it is a shrink fit on the tube. In order to engage the key in the cam before the fitting portion is encountered, the tube is made longer than in the finished state and is cut off after freezing in. An alternative method of fitting would be to fit into the end of the tube a mandrel with a keyway to match up with the one on the tube. The mandrel could be located in the tube by a short key engaging with a slot in the tube end and the bore of the tube would have to be reamed.

Will you please let us know which method you prefer.

We should like this method of fixing to be applied to all Wraith cams, including the Continental Ph.III gear. Existing cams can be modified to suit.

Rm{William Robotham - Chief Engineer}/F.J.Hardy.
  
  


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