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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 Hardy Spicer & Co. Ltd. discussing journal investigation and radial clearance tolerances.

Identifier  ExFiles\Box 148\4\  scan0087
Date  1st November 1938
  
1262.

HARDY SPICER & CO. LIMITED.

TELEPHONE: BIRCHFIELDS 4504-9 (6 LINES)
TELEGRAMS & CABLES: AUTOJOINTS, BIRMINGHAM
CODE: BENTLEY'S PHRASE
LONDON OFFICE
54 ST.{Capt. P. R. Strong} THOMAS STREET,
LONDON S.E.1
TELEPHONE: HOP 0703

Manufacturers of HARDY SPICER UNIVERSAL JOINTS AND PROPELLER SHAFTS · GENUINE HARDY FLEXIBLE COUPLINGS BRITISH BOUND BROOK OIL-LESS & COMPO OIL-RETAINING BEARINGS

ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY

Registered Office and Works
BIRCH ROAD, WITTON
BIRMINGHAM·6
ENGLAND

OUR REF JAD.MW
YOUR REF DA.{Bernard Day - Chassis Design}2/G

1st November,1938.

Messrs. Rolls Royce Limited.
D E R B Y.

Attention of Mr.Grylls.

Dear Mr.Grylls,

We are investigating the journal which you handed to me but in the meantime I am dealing with the question of radial clearance.

You gave me a measure figure of .003 that existed on the sample and we took this to be on the diameter and not on the radius.

Checking up our tolerances we find it is possible to have between .001 and .003. In case the details will interest you they are as follows:-

2 Rollers @ ............ .0940 max = .1880
Maximum diameter of pin .......... = .6580
.8460
Min. bore of race........................... .847
- .846
.001 Min. Clearance.

2 Rollers @ ............ .09375 min. =.18750
Min.diameter of pin............... =.65750
.84500
Maximum bore of race ............... .848
- .845
.003 Max.Clearance.

We will write again as soon as we have gone further into the investigation.

Yours faithfully,
p.p.HARDY,SPICER & CO. LIMITED.

J G Daniel
Director.
  
  


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