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gear tolerances

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250139
EISBN: 978-1-62708-345-4
... Abstract Powder metallurgy (P/M) is a flexible metalworking process for the production of gears. The P/M process is capable of producing close tolerance gears with strengths to 1240 MPa at economical prices in higher volume quantities. This chapter discusses the capabilities, limitations...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 March 2024
DOI: 10.31399/asm.tb.gvar.t59360001
EISBN: 978-1-62708-435-2
... and other rotating parts used in low-speed gearboxes are machined to tolerances that make them inherently stable over the operating range. Dynamic balancing is seldom required as a result even with gears made to AGMA quality class 8 and lower. This is not the case with high-speed gearboxes, however...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 March 2024
DOI: 10.31399/asm.tb.gvar.9781627084352
EISBN: 978-1-62708-435-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320185
EISBN: 978-1-62708-347-8
... Cost factor Single case depth (a) 1.0 Multiple case depths (integral design of gears with different pitch) 2.5 (a) Indicates preferred selection Case Depth Tolerance As with any other manufacturing process, the wider the tolerance on dimension is, the lower the cost...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250129
EISBN: 978-1-62708-345-4
..., and relatively low accuracy of transmitted motion ( Ref 1 ). When the application involves higher values of one or more of these characteristics, forged or cut/machined gears are used. Table 1 lists the tolerances in terms of American Gear Manufacturers Association (AGMA) quality numbers for various gear...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 March 2024
DOI: 10.31399/asm.tb.gvar.t59360121
EISBN: 978-1-62708-435-2
.... The quality level of gear tooth geometry, balancing of rotating components, and quality of bearings cannot be compromised for high-speed gears. It is also important to hold the dimensional tolerances and gear geometry tolerances as indicated. Gear Tooth Quality for High-Speed Gears The guidelines...
Image
Published: 01 September 2005
Fig. 26 Setup for grinding a thin-web gear. Damper plates prevent excessive vibration. Dimensions in figure given in inches Gear details Type Involute spur Number of teeth 63 Diametral pitch 12 Pressure angle 20° Tolerance  Involute error, mm (in.) 0.005 More
Image
Published: 01 December 1999
Fig. 7 Minimum effective case depth for carburized gears, h e min . The values and ranges shown on the case-depth curves are to be used as guides. For gearing in which maximum performance is required, detailed studies must be made of the application, loading, and manufacturing procedures More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320133
EISBN: 978-1-62708-347-8
... history of successful nitriding of a gear is presented at the end of this Chapter. Applications While carburizing is the most effective surface-hardening method, nitriding excels when gear tooth geometry and tolerances before heat treating need to be maintained without any finishing operation...
Image
Published: 01 September 2005
Fig. 32 Grinding of a spiral bevel gear. Dimensions in figure given in inches Gear details Type Spiral bevel (octoid) Number of teeth 51 Diametral pitch 4 Helix angle 30° Whole depth, mm (in.) 12.07 (0.475) Tolerance, tooth-to-tooth, mm (in.) 0.008 (0.0003 More
Image
Published: 01 December 1995
Fig. 3-14 Cast tooth bevel gears produced by the shell molding process to obtain excellent surfaces and close tolerances More
Image
Published: 01 September 2005
Fig. 5 Cast tooth bevel gear produced by the shell molding process to obtain excellent surfaces and close tolerances. Source: Ref 3 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270102
EISBN: 978-1-62708-301-0
... tolerances and, probably, the existence of a burr at the chamfer at the interface could have accelerated the failure. Conclusion The dowel bolts failed due to fatigue. Fatigue was initiated by fretting in some bolts. Recommendations Prevent the gap between the bevel and spur gears...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040319
EISBN: 978-1-62708-300-3
... deflection, and process inconsistencies, and discusses related innovations. forging machines near-net shape forging 23.1 Introduction Net and near-net shape forging companies generally produce for the automotive industry. These components are characterized by close dimensional tolerances...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250227
EISBN: 978-1-62708-345-4
... Applications While carburizing is the most effective surface-hardening method, nitriding excels when gear tooth geometry and tolerances before heat treating need to be maintained without any finishing operation, such as grinding after heat treatment. Although, through-hardening is capable of maintaining...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250155
EISBN: 978-1-62708-345-4
... Abstract The through-hardening process is generally used for gears that do not require high surface hardness. Four different methods of heat treatment are primarily used for through-hardened gears. In ascending order of achievable hardness, these methods are annealing, normalizing and annealing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320021
EISBN: 978-1-62708-347-8
... Abstract Through-hardening heat treatment is generally used for gears that do not require high surface hardness. In through hardening, gears are first heated to a required temperature and then cooled either in the furnace or quenched in air, gas, or liquid. Four heat treatment methods...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 March 2024
DOI: 10.31399/asm.tb.gvar.t59360051
EISBN: 978-1-62708-435-2
... on an involute-checking machine. Figure 1.19 , in Chapter 1 , shows the involutes with plus and minus profiles. Because it is not possible to manufacture ideal gear tooth geometry, allowable tolerances are recommended by the American Gear Manufacturers Association (AGMA) for different quality standards...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250089
EISBN: 978-1-62708-345-4
... that must meet close tolerances is sometimes a problem because the method used must frequently be restricted to shaping and shaving. The same quality requirements cannot be met by shaping and shaving as by hobbing and grinding. When tolerances for cluster gears are closer than can be met by shaping...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440283
EISBN: 978-1-62708-262-4
..., nitriding, and ferritic nitrocarburizing to provide an accurate heat treating process evaluation. This appendix briefly describes the advantages and selection and design considerations of test coupons. A typical example of the use of test pins for monitoring carburizing and hardening of gears is provided...