Rolls-Royce Archives
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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).
Graph showing curves for helix angles, pitch, and gear ratio for Marles-Weller gears.

Identifier  ExFiles\Box 28\2\  Scan064
Date  1st March 1932
  
B.F.3.32
GEAR RATIO
10:1
11:1
12:1
13:1
14:1
15:1
16:1
17:1
18:1
19:1
20:1
21:1
22:1
23:1
24:1
25:1
26:1
27:1
28:1
PITCH (INCHES)
1/32, 1/16, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32, 1/2, 17/32, 9/16, 19/32, 5/8, 21/32, 11/16, 23/32, 3/4, 25/32, 13/16, 27/32, 7/8, 29/32, 15/16, 31/32, 1
HELIX ANGLE
10°
11°
12°
13°
14°
15°
MARLES - WELLER GEARS -
HELIX ANGLES, PITCH, & GEAR RATIO CURVES
PITCH AND HELIX ANGLE
PITCH AND GEAR RATIO O.{Mr Oldham} & Q. GEARS
O.{Mr Oldham} & Q. GEARS
  
  


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