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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).
Investigation and test results for lever fixing on a shaft, specifically concerning slip load.

Identifier  ExFiles\Box 15\5\  Scan316
Date  3rd June 1932
  
X7310.

DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer}

E.5/HP.3.6.32.

c.c. R.H.
By.{R.W. Bailey - Chief Engineer} RHC.{R. H. Coverley - Production Engineer}

re Lever fixing on shaft - 19-EX.
--------------------------------

In reply to your memo concerning the gearbox selector lever, we had formed the opinion that the biting in bolt was powerful enough to hold the lever still, but that in the case of 19-EX the bolt had been pulling against the taper pin so that when the pin failed it left the job insufficiently tight.

RHC{R. H. Coverley - Production Engineer} has made some experiments to determine what load is required to make the lever slip on the shaft.

The results carried out on three different fittings are as follows:-

[TABLE START]
SLIP LOAD - LBS.
Shaft dia. | Lever bore. | Tolerance | Present .25" bolt. | .312 bolt.
| | | | 1st test. | 2nd test. | 1st test | 2nd Test.
.750" | .752" | + .002 (normal fitting) | 570 | 450 | 570 | 630.
.750" | .750" | 0 | 450 | 440 | 520 | 540
.750" | .748" | - .002. | 400 | 400 | 490 | 530
[TABLE END]

Since the charge speed lever is 15.5" long to centre of handle, and slider lever 5.9" long, the above figures should be divided by 2.625 to obtain the equivalent hand pressure, making no allowances for loss of effort, due
  
  


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