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ELEMENTS OF METRIC GEAR TECHNOLOGY BS 235 1972 BS 436 Pt 1 1987 BS 436 Pt 2 1984 BS 436 Pt 3 1986 BS 721 Pt 1 1984 BS 721 Pt 2 1983 BS 978 Pt 1 1984 BS 978 Pt 2 1984 BS 978 Pt 3 1984 BS 978 Pt 4 1965 BS 1807 1981 BS 2007 1983 BS 2062 Pt 1 1985 BS 2062 Pt 2 1985 BS 2518 Pt 1 1983 BS 2518 Pt 2 1983 BS 2519 Pt 1 1976 BS 2519 Pt 2 1976 BS 2697 1976 BS 3027 1968 BS 3696 Pt 1 1984 BS 4517 1984 BS 4582 Pt 1 1984 BS 4582 Pt 2 1986 BS 5221 1987 BS 5246 1984 BS 6168 1987 Table 1-2 (Cont.) PHONE: 516.328.3300 • FAX: 516.326.8827 • WWW.SDP-SI.COM Foreign Metric Gearing Standards UNITED KINGDOM – BSI (British Standards Institute) Specification of gears for electric traction Spur and helical gears – Basic rack form, pitches and accuracy (diametral pitch series) Spur and helical gears – Basic rack form, modules and accuracy (1 to 50 metric module) (Parts 1 & 2 related but not equivalent with ISO 53, 54, 1328, 1340 & 1341) Spur gear and helical gears – Method for calculation of contact and root bending stresses, limitations for metallic involute gears (Related but not equivalent with ISO / DIS 6336 / 1, 2 & 3) Specification for worm gearing – Imperial units Specification for worm gearing – Metric units Specification for fine pitch gears – Involute spur and helical gears Specification for fine pitch gears – Cycloidal type gears Specification for fine pitch gears – Bevel gears Specification for fine pitch gears – Hobs and cutters Specification for marine propulsion gears and similar drives: metric module Specification for circular gear shaving cutters, 1 to 8 metric module, accuracy requirements Specification for gear hobs – Hobs for general purpose: 1 to 20 d.p., inclusive Specification for gear hobs – Hobs for gears for turbine reduction and similar drives Specification for rotary form relieved gear cutters – Diametral pitch Specification for rotary relieved gear cutters – Metric module Glossary for gears – Geometrical definitions Glossary for gears – Notation (symbols for geometrical data for use in gear rotation) Specification for rack type gear cutters Specification for dimensions of worm gear units Specification for master gears – Spur and helical gears (metric module) Dimensions of spur and helical geared motor units (metric series) Fine pitch gears (metric module) – Involute spur and helical gears Fine pitch gears (metric module) – Hobs and cutters Specifications for general purpose, metric module gear hobs Specifications for pinion type cutters for spur gears – 1 to 8 metric module Specification for nonmetallic spur gears NOTE: Standards available from: ANSI, 1430 Broadway, New York, NY 10018; or BSI, Linford Wood, Milton Keynes MK146LE, United Kingdom I R T 1 2 3 4 5 6 7 8 9 10 11 1.3.2 Symbols Gear parameters are defined by a set of standardized symbols that are defined in JIS B 0121 (1983). These are reproduced in Table 1-3. The JIS symbols are consistent with the equations given in this text and are consistent with JIS standards. Most differ from typical American symbols, which can be confusing to the first time metric user. To assist, Table 1-4 is offered as a cross list. 12 13 14 15 T-13 A
I R T 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 A ELEMENTS OF METRIC GEAR TECHNOLOGY Center Distance Circular Pitch (General) Standard Circular Pitch Radial Circular Pitch Circular Pitch Perpendicular to Tooth Axial Pitch Normal Pitch Radial Normal Pitch Normal Pitch Perpendicular to Tooth Whole Depth Addendum Dedendum Caliper Tooth Height Working Depth Tooth Thickness (General) Circular Tooth Thickness Base Circle Circular Tooth Thickness Chordal Tooth Thickness Span Measurement Root Width Top Clearance Circular Backlash Normal Backlash Blank Width Working Face Width T-14 Table 1-3A PHONE: 516.328.3300 • FAX: 516.326.8827 • WWW.SDP-SI.COM The Linear Dimensions and Circular Dimensions Terms Symbols Terms Symbols a p p p t p n p x p b p bt p bn h h a h f h h' h w s s s b s W e c j t j n b b' b w * These terms and symbols are specific to JIS Standard Terms Pressure Angle (General) Standard Pressure Angle Working Pressure Angle Cutter Pressure Angle Radial Pressure Angle Pressure Angle Normal to Tooth Axial Pressure Angle Helix Angle (General) Standard Pitch Cylinder Helix Angle Outside Cylinder Helix Angle Base Cylinder Helix Angle Lead Angle (General) Standard Pitch Cylinder Lead Angle Outside Cylinder Lead Angle Base Cylinder Lead Angle Table 1-3B Symbols a a a' or a w a 0 a t a n a x b b b a b b g g g a g b Lead Contact Length Contact Length of Approach Contact Length of Recess Contact Length of Overlap Diameter (General) Standard Pitch Diameter Working Pitch Diameter Outside Diameter Base Diameter Root Diameter Radius (General) Standard Pitch Radius Working Pitch Radius Outside Radius Base Radius Root Radius Radius of Curvature Cone Distance (General) Cone Distance Mean Cone Distance Inner Cone Distance Back Cone Distance Mounting Distance Offset Distance Angular Dimensions Shaft Angle Terms Cone Angle (General) Pitch Cone Angle Outside Cone Angle Root Cone Angle Addendum Angle Dedendum Angle Radial Contact Angle Overlap Contact Angle Overall Contact Angle Angular Pitch of Crown Gear Involute Function p z g a g f g a g b d d d' d w d a d b d f r r r' r w r a r b r f p R R e R m R i R v *A *E Symbols S d d d a d f q a q f f a f b f r t inv a Continued on the next page
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I R 1 2 3 4 5 6 7 8 9 10 11 12 13 T 14 15 A - SDP/SI

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