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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 The Hoffmann Manufacturing Co. Ltd. regarding steering roller assemblies and bearing adjustments.

Identifier  ExFiles\Box 9\7\  07-page167
Date  3rd May 1938
  
1300?

BRANCHES: LONDON, BIRMINGHAM,
MANCHESTER, LEEDS, GLASGOW.
AGENTS IN PRINCIPAL COUNTRIES
THROUGHOUT THE WORLD.

HOFFMANN
Registered Trade Mark

BALL-AND-ROLLER-BEARINGS
STEEL-BALLS-AND-ROLLERS

THE HOFFMANN MANUFACTURING CO. LTD.

CONTRACTORS TO THE ADMIRALTY, WAR OFFICE AND INDIA OFFICE

TELEPHONE 3151 (FIVE LINES)
TELEGRAMS: HOFFMANN, CHELMSFORD
CODES USED: A.B.C. 5TH EDITION. BENTLEY PHRASE
BENTLEY 2ND PHRASE. MARCONI,
AND WESTERN UNION 5 LETTER

MESSRS. ROLLS ROYCE. LTD.,
DERBY.

CHELMSFORD.

3rd.May 1938.

Handwritten:
Rm{William Robotham - Chief Engineer}/PSH
R.H.C. / E.G.
Please note and return F.H. H.H
For the attention of F.J.Hardy, Esq.,

YOUR REF.
IN YOUR REPLY PLEASE QUOTE
OUR REF. JLH/LGJ/897.
DO.105683A.

Dear Sir,

Re:- STEERING ROLLER ASSEMBLIES

With further reference to our letter of the 5th.March, reference JLH/WAH, we have now been able to carry out some further investigations regarding the adjustment of bearing N.2790 and now have pleasure in offering the following comments.

Firstly we would explain that, when checking the dimensional adjustment of these parts we can arrange only lightly to clamp the inner races together and we have found that, in order to meet your requirements for frictional resistance, it is necessary to give the bearings a considerably easier adjustment when the races are only lightly clamped owing to the elastic compression which occurrs when they are clamped by a fully tightened nut and bolt.

In the case of bearing N.2784 where a distance piece is fitted between the inner races, we have found it necessary to allow slight end movement in the lightly clamped condition, and it is for this reason that the bearings have had labels attached to them indicating a small amount of end movement.

Further investigations have shown that with bearing N.2790, owing to there being no distance piece, the elastic compression of the parts is rather less, and consequently a rather tighter adjustment is necessary in the lightly clamped condition.
  
  


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