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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 Ransome & Marles Bearing Co. detailing the results of a 500-hour test run on pinion bearings, noting a cage fracture.

Identifier  ExFiles\Box 114\2\  scan0066
Date  21th September 1934
  
London Office:
17, VICTORIA STREET,
WESTMINSTER, S.W.1.
Telephone: VICTORIA 4278-4279
Telegrams:
OFFISLUNDA, SOWEST, LONDON

BALL & ROLLER R&M BEARINGS

43807

Telegraphic Address:
"BEARINGS, NEWARK"
Telegraphic Code:
BENTLEY'S
Telephone Nos:
NEWARK 456-457-458

Contractors to H.M. Admiralty, War Office, Air Ministry, Colonial Offices &c.

RANSOME & MARLES BEARING Co., LTD.,

MANUFACTURERS OF BALL & ROLLER BEARINGS

NEWARK ON TRENT.

Branch Offices:
LONDON, BIRMINGHAM, MANCHESTER, LEEDS, NOTTINGHAM AND--

Branch Offices:
SHEFFIELD, BRISTOL, GLASGOW, NEWCASTLE, DUBLIN, BELFAST.

Our Ref. Tech.Dept. FOH/MB. Your Ref.

GRY{Shadwell Grylls}

Messrs. Rolls Royce, Limited,

DERBY.

21st September, 1934.

FOR THE ATTENTION OF -. GRYLLS ESQ:

Dear Sirs,

PINION BEARINGS 2/MDJT.35.

With reference to the above, we have completed a 500-hour run at 3,000 r.p.m. on the test rig which was demonstrated to you during a recent visit, it being remembered that we were unable to put on the maximum loading owing to the deflection of the test spindle.

The actual loading during this test was 3,820 lbs. thrust and 965 lbs. journal, rust-veto being the lubricant, and the bearing is in every way in perfect condition, with the exception that one of the cages has fractured across one ball hole.

There are no very clear indications as to why this fracture should have occurred, and we have not unduly disturbed the job, as we feel that you would desire to see the bearing in its existing state, before any further investigation takes place. No appreciable cage drag has occurred, and we certainly feel that there has not been sufficient to cause this fracture, which therefore appears to indicate
  
  


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