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DRAFTING MANUAL

Update 69 Gary Whitmire DRAFTING MANUAL Gears Bevel and Hypoid Drafting Practice Section 4 9 1 Page 2 August 2003 Genium Publishing Corporation

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	Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
This section provides the basis for unifo
rmity in engineering gears drawings and their technical data for gears 
with intersecting axes (bevel gears), and nonparallel, 
nonintersecting axes (hypoid gears). It also discusses the 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
4.0 Gear Drawing Practices 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
.XXX
.XXX
)
(
X.XXXX
)
(
X.XXX
)
X.XXX
X.XXX
X.XXX
X.XXXX
X.XXXX
X.XXX
X.XXX
See note 1
XX.XXű
FACE APEX
.XXX  A
MATING
Note 1: When face angle distance and back angle distance (See Figure 9) are 
be given as reference dimensions on the drawing without a tolerance.
 Gear data not included in Figure 1 are tabulated on the drawing as shown in Figure 2. The drawing must 
also show material and heat treatment specifications. 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
ADDENDUM (.XXX) (See note 2) 
WORKING DEPTH (.XXX) (See note 2) 
WHOLE DEPTH .XXX-.XXX (See note 2) 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
.XXX
.XXX
)
(
.XXX
)
(
X.XXXX
)
(
X.XXX
)
X.XXX
X.XXX
X.XXX
X.XXXX
X.XXXX
FACE APEX
MATING
Note 1: When face angle distance and back angle distance (See Figure 9) are 
be given as reference dimensions on the drawing without a tolerance.
X.XXX
Figure 3. Spiral Bevel Gear/Pinion 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
4.5.2 
Gear data not illustrated in Figure 3 are tabulated on the drawing as shown in Figure 4. The drawing must 
also show material and heat treatment specifications. 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
PART NUMBER OF MATE XXXXXXXX-X 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
.XXX
)
(
X.XXXX
)
X.XXX
FACE APEX
ROOT APEX
MATING
Note 1: When face angle distance and back angle distance (See Figure 9) are 
be given as reference dimensions on the drawing without a tolerance.
A
X.XXXX
.XXX
)
.XXX  A - B
Gary Whitmire 
Drafting Practice
Section 4.9.1 
August, 2003 
 
Genium Publishing Corporation 
.XXX
)
(
.XXX
)
(
X.XXXX
)
X.XXX
X.XXX
X.XXX
X.XXX
X.XXX
X.XXXX
X.XXXX
See note 1
XX.XX
XX.XX
FACE APEX
ROOT APEX
MATING
Note 1: When face angle distance and back angle distance (See Figure 9) are 
be given as reference dimensions on the drawing without a tolerance.
.XXX
XX.XX
4.6.2 
Gear data not included in Figures 5 and 6 are tabula
ted on the drawing as shown in Figure 7. The drawing 
must also show material and heat treatment specificati
ons. Distances from the pitch apex for the gear member 
only, face apex, and root apex to the crossing point (
centerline of the mating member) are included as reference 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 10 
August, 2003 
 
Genium Publishing Corporation 
 the crossing point and negative when the apex lies 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 11 
August, 2003 
 
Genium Publishing Corporation 
AGMA QUALITY CLASS XX 
TOOTH FORM GENERATED OR FORMATE® OR 
 HELIXFORM® 
DRIVING MEMBER PINION OR GEAR 
DIRECTION OF ROTATION CW AND/OR CCW 
MFG SUMMARY NUMBER XXXXXX 
PART NUMBER OF MATE XXXXXXXX-X 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 12 
August, 2003 
 
Genium Publishing Corporation 
for proper tooth contact and backlash
(X.XXXX)
GEAR MOUNTING DISTANCE
PINION MOUNTING DISTANCE
DIRECTION OF ROTATION      CW AND / OR CCW
MFG SUMMARY NUMBER       XXXXXX
PART NUMBER OF DRIVER     XXXXXX
PART NUMBER OF DRIVEN     XXXXXX
TOEHEELTOTALGEAR CONCAVETOEHEEL
TOTAL
VXXXXXXVXXXXXX
HXXXXXXHXXXXXX
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 13 
August, 2003 
 
Genium Publishing Corporation 
5.1 Axial Plane 
an illustration of the axial plane of a bevel gear. 
Figure 10 (lower view) is an illustration 
of the axial plane of a hypoid gear. 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 14 
August, 2003 
 
Genium Publishing Corporation 
Crown to Crossing Point
Crown to
Transverse
Face  Apex
Crown
Front
Crossing
Toe
A
Angle
Face Angle Distance
Distance
Back Cone
Pitch Element
1. The pitch apex and the root apex may or may not coincide depending on individual gear design.
2. See Figure 10 for developed view of A-A.
Figure 9. Bevel Gear Nomenclature – Axial Plane 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 15 
August, 2003 
 
Genium Publishing Corporation 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 16 
August, 2003 
 
Genium Publishing Corporation 
Face Angle Distance
Back Angle Distance
Face Width
Root Apex to 
Crossing
Point
Face Angle Distance
Crown to Crossing Point
Figure 11. Hypoid Gear Nomenclature – Axial Plane 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 17 
August, 2003 
 
Genium Publishing Corporation 
Measured Whole 
Figure 12. Bevel Gear Nomenclature – Normal Plane at the Mean Point 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 18 
August, 2003 
 
Genium Publishing Corporation 
5.7 Tooth Trace 
Mean Spiral Angle
Section Through Tooth
Concave Side of Tooth
Tooth Trace
Convex Side of Tooth
Mean Point of Tooth
Figure 13. Mean Spiral Angle 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 19 
August, 2003 
 
Genium Publishing Corporation 
Figure 14. Pressure Angle 
5.11 Spiral Angle 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 20 
August, 2003 
 
Genium Publishing Corporation 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 21 
August, 2003 
 
Genium Publishing Corporation 
5.15.1 Generated 
- A tooth form where both members have tooth profiles produced with a relative motion 
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 22 
August, 2003 
 
Genium Publishing Corporation 
5.18.2 Backlash Variation 
the circular-thickness 
arc in the normal plane. The mean measuring addendum is the value at the center of the tooth length. 
5.21 Measuring Thickness 
- The length of the chord subtending a circ
mean measuring thickness is the value u
5.22 Mean Measuring Depth 
- The depth of the tooth at the center of the tooth length.
5.23 Runout Tolerance 
- The total allowable variation of the dist
Gary Whitmire 
Drafting Practice
Section 4.9.1 
Page 23 
August, 2003 
 
Genium Publishing Corporation 
(toe) and outer (heel) end of the tooth while maintaining th
e contact pattern in the middle of the tooth profile. For 
control purposes, the tooth contact pattern should duplicate 
the pattern on the sample pair of gears when similarly 
positioned in the testing machine. These data are optiona
l on a gear drawing and specified when a satisfactory 
development has been achieved. See Figures 4 and 7. 
- The perpendicular distance from the intersec
surface at the back of a bevel or hypoid gear to
 the face cone element. See Figures 9 and 10.
5.31 Back Angle Distance 
- The perpendicular distance from the intersec
surface at the back of a bevel or hypoid gear to
 the back cone element. See Figures 9 and 10.