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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).
The destruction testing of a steering pivot on a reversal test rig.

Identifier  ExFiles\Box 2\B002_X168\  00000001-page117
Date  9th June 1913
  
From Exp. Dept.
Copies for:
Mr Johnson.
Mr Royce.
Mr Holmsley.
Mr Nadin.

Report on a Further test of Steering
Pivot F.3253. - A.168

This is the second pivot of the latest strong type which I have run to destruction on the reversal test rig.
This pivot was .03" under thickness limit in the base of the U section below the root of the stub axle. The forging is by Hughes Johnson and is heat treated by ourselves.
The crankshaft which oscillates the pivot was run at a speed of 375 revs per minute, thus giving 750 reversals per min.
This speed was maintained and the pivot showed a slight crack after 56 hours running and broke off after running 60 hours 10 minutes.

A noticeable feature is that we break a large number of cross steering levers on this test now. On this pivot alone no less than 10 levers were broken, the life of them being as follows.

12 hours.
3 " 45 mins.
6 " 45 "
3 " 33 "
12 " 25 "
8 " 3 "
1 " 15 "
2 " 15 "
2 " 15 "

The length of life varies so much and is so inconsistent that it looks as if the material of the levers themselves
  
  


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