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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).
Summary of specifications and settings for manufacturing hypoid gears.

Identifier  ExFiles\Box 98\1\  scan0170
Date  25th July 1939
  
CONCAVE (GEAR TOOTH BEARING)
HYPOID GEARS
SUMMARY NO. 1000
GLEASON WORKS
ROCHESTER, N.Y., U.S.A.
CONVEX (GEAR TOOTH BEARING)
PINION SETTINGS
FOR ROLLS ROYCE, LTD.
COMBINATION 13 x 43
DRIVE PRESSURE 18° 15' REVERSE PRESSURE 24° 16' CONE DISTANCE 4.478"
PINION GEAR FACE 1 3/16" D.P. 5.059
PINION SPIRAL V.{VIENNA} 45° 11' GEAR SPIRAL V.{VIENNA} 35° 37' OFFSET OF PINION .650" BELOW CENTER
GENERAL DIMENSIONS
NO. ITEM PINION GEAR
1 PART NUMBER GB4974 GB4973
2 REF. B. P. NUMBER
3 ADDENDUM .113"
4 WORKING DEPTH .321"
5 WHOLE DEPTH .364" .362"
6 FACE ANGLE 21° 17' 73° 4'
7 PITCH ANGLE 18° 35' 71° 38'
8 ROOT ANGLE 16° 43' 68° 27'
9 DEDENDUM ANGLE 3° 11'
10 OUTSIDE DIAMETER 3.375" 8.571"
11 CONE CENTER TO CROWN 4.332" 1.305"
12 CONE CENTER TO BACK 4.682" 2.291"
13 NORMAL CHORD. ADDEN. * .185" * .098"
14 NORMAL CHORD. THICK. * .259" * .180"
15 HAND OF SPIRAL L R
16 CUTTING METHOD FIXED SETTING SPREAD BLADE
17 MOUNTING DISTANCE 4.525" 2.350"
18 SOFT MOUNTING DISTANCE 4.528"
19 DRIVER PINION ROTATION C.W.
GEAR SETTINGS
NO. GEAR SETTINGS
20 ROUGHING CUTTER SPECIFICATIONS DIAMETER 9" POINT WIDTH .050" .025"R
21 CUTTER AXIAL POSITION SLIDING BASE POS. A.005"
15" SPIRAL BEVEL ROUGHER SETTINGS.
22 MACH. ROOT V 68° 27'
23 HORIZONTAL OUT 1.796
24 ANGULAR UP 16° 21'
FINISHING CUTTER SPECIFICATIONS
25 CUTTER NUMBER #4 1/2-17 1/2 I, 25-0
26 FINISHING CUTTER DIAM. 9"
27 FINISHING POINT WIDTH .090" .025"R
15", No.16 SPIRAL GENERATOR SETTINGS
28 MACHINE ROOT V 68° 27'
29 HORIZONTAL (15") OUT 1.305"
30 VERTICAL (15") UP 3.658"
31 RADIAL (#16) 3.884"
CRADLE ANGLE (#16) 70° 22'
MACH. CENTER TO BACK 2.401"
CUTTER AXIAL POS. SLIDING BASE (#16) A.102"
3/10 RATIO CHANGE GEARS Nc/75
DR. STUD DN. DR. STUD DN.
48 90 58 97
56 74 100
TEST ROLL 30° CRADLE 31° 53' WORK.
PINION SETTINGS
NO. DEVELOPED SETTINGS
ROUGHING BOTTOM TOP
15" HYPOID GENERATOR FINISHING
ROUGHING CUTTER SPECIFICATIONS
44 MACHINE ROOT V 16° 43' 17° 3'
32 DIAMETER 9" PT. WIDTH IN. BLADE V OUT. BL. V .050 .025R 28°-0' 14°-0'
33 MACHINE ROOT ANGLE 16° 43'
45
34 CUTTER AXIAL LOCATION SLIDING BASE POS. ADVANCE .005"
46 MACH. CENTER TO BACK 4.398" 4.683"
35 MACH' CENTER TO BACK 4.707"
47 CUTTER NUMBER TOOTH & BLADE RADIUS #21-17 1/2-O.B. #36-25-I.B.
15" SPIRAL BEVEL ROUGHER SETTINGS
48 POINT DIAMETER 8.680" 9.200"
36 HORIZONTAL OUT 1.239"
49 OFFSET OF BLANK DOWN .757" DOWN .589"
37 ANGULAR DOWN 14° 7'
50 CUTTER AXIAL LOCATION WITHDRAW .165" WITHDRAW .231"
15", No.16 HYPOID GENERATOR SETTINGS
51 HORIZONTAL OUT .717" OUT 1.740"
38 HORIZONTAL DOWN 3.660"
52 VERTICAL DOWN .846" DOWN 2.953"
39 VERTICAL DOWN 3.172"
53 CUTTER SPINDLE V IN 0° 41' DOWN 2° 34'
40 OFFSET OF BLANK 0
54 CUTTER COLUMN V IN 0° 43' IN 2° 27'
41 RADIAL 3.283"
DRIVER STUD DRIVEN RATIO DRIVER STUD DRIVEN
42 CRADLE V 284° 56'
CHANGE 80 54 CHANGE 48 68
3/10 RATIO CHANGE GEARS Nc/75
GEARS 69 97 GEARS 77 51
43 DR. STUD. DN. DR. STUD DN. 63 70 48 65 69 66 67 91
TEST ROLL 20° CRADLE 62° 44' WORK
CRADLE WORK TEST ROLL CRADLE WORK
20° 70° 15' 20° 71° 3'
V & H CHECK SOFT GEAR WITH SOFT PINION
BOTTOM TOE HEEL TOTAL TOP TOE HEEL TOTAL
V +9 -11 20 V -6 +20 26
H -10 +14 24 H +4 -28 32
BACKLASH ALLOWANCE .004"-.006"
CUSTOMER'S ORDER NO. 2324
SALES ORDER NO. A04310
NO. OF PAIRS 1 SOFT 5 HARD
DATE JULY 25, 1939.
MADE OUT BY [signature] DATE Aug 8, 1939 CHECKED BY [signature]
* MEASUREMENT AT MIDDLE OF FACE
FORM ED{J. L. Edwards} 124
  
  


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