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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).
List of specifications and dimensions for a 'Delage' worm gear.

Identifier  ExFiles\Box 21\4\  Scan135
Date  5th February 1923
  
X/3525
5. 2. 23.

PARTICULARS OF "DELAGE" WORM.

Top diameter...........3.062
Pitch "...........2.750
Bottom "...........2.420
Helix angle..........17° 45 mins.
Angle of tooth.........10°
Linear pitch...........500
4 start..............4 start.
Lead.................2"
Bottom of tooth........ .117.

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RHC.{R. H. Coverley - Production Engineer}
  
  


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