GEAR Nomenclature

Racks Worm Gear Bevel Gears W Worm, Cast Iron R Steel B Bevel Gear, Cast Iron WB Worm, Bronze RA Steel, Heavy Backing B Pinion, Steel D / Q (Suffix) Double or TR Steel, 20°, Heavy Backing Quadruple Thread BS Bevel Gear, Steel R20 Steel, 20°, Wide Face BS Pinion, Steel Worms and Worm Gears come standard as right hand. If left hand is needed, it must be specified.

Examples: Examples: Examples: R6X2 14½° STD Backing 6DPX2' Long W660 Cast Iron 6DP 60T Right Hand B1060-3 Cast Iron 10DP 60T 3:1 Ratio RA6X4 14½° Heavy Backing 6DPX4' Long WB1020 Bronze 10DP 20T Right Hand B1020-3 Steel 10DP 20T 3:1 Ratio TR6X6 20° STD Width 6DPX6' Long W640D Cast Iron 6DP 40T Double BS1040-2 Steel 10DP 40T 2:1 Ratio R206X6 20° Wide Face 6DPX6' Long Thread Right Hand BS1020-2 Steel 10DP 20T 2:1 Ratio

Spur Gears Worm Miter Gears

S Steel W Steel M Miter Gear, Steel TS Steel, 20° WH Steel With Hub A / B Larger Bore (Suffix) C Cast Iron Projection HM Miter, Hardened TC Cast Iron, 20° WG Steel Hardened Teeth H Hardened Teeth Ground Threads K KW & SS NM Non-Metallic WHG Steel Hardened Ground Threads Notes: with Hub Projection ALWAYS 1: 1 RATIO. D / Q (Suffix) Double or Quadruple Thread Same number of teeth on each mating Gear. Examples: Examples: Examples: S620 Steel 6DP 20T 14½°PA W6 Steel 6DP Right Hand M824 Steel 8DP 24T TS621 Steel 6DP 21T 20°PA WH6 Steel w/Hub Projection 6DP Right Hand M824A Steel 8DP 24T Larger Bore C675 Cast Iron 6DP 75T 14½°PA WG6 Steel Case Hardened HM1020 Steel Hardened Teeth 10DP 20T S620H Steel 6DP 20T Hardened 14½°PA Ground Threads 6DP Right Hand HMK1020 Steel Hardened 10DP 20T NM620 Non-Metallic 6DP 20T 14½°PA WHG6 Steel w/Hub Projection Hardened with KW & SS S612BS 1 Steel 6DP 12T 1" Bore 14½°PA Ground Threads 6DP Right Hand TS816BS 7/8 Steel 8DP 16T .875 Bore 20°PA W6D Steel 6DP Double Thread Right Hand Typical Spur Gear Nomenclature Common Formulas

Pressure Angle Bore Size CIRCULAR PITCH 20º T S 3 24 BS 1 Bored with Keyway & Set Screws ADDENDUM OUTSIDE Material PITCH DIAMETER DIAMETER S Steel # of Teeth C Cast Iron WHOLE DEPTH NM Non-Metallic Diametral Pitch (DP) WORKING DEPTH DEDENDUM BOTTOM OR ROOT DIAMETER

Information Needed to Quote Gears CLEARANCE

FACE N + 2 N OD = DP = CP Circular Pitch 1. Pitch (3DP, 4DP, 2CP, etc.) 8. Hub thru diameter DP PD N Number of Teeth 3.1416 2. Number of teeth 9. Length through bore CP = DP Diametral Pitch or hub projection DP PD Pitch Diameter 3. Pressure angle PD (Dr) + PD (Dn) OD Outside Diameter (14½°, 20°, etc.) 10. Bore CD = 2 CD Center Distance HUB 4. Face width 11. Keyway size Module 25.4 O.D. = Dr Driver Pitch DP 5. Material (1144, 12. Number and size Dn Driven N Large SIZING EXAMPLE: 1040, 4140, etc.) of set screw(s) Ratio = Gear with 46 teeth has N Small an OD of 6" 6. Hardened teeth? 13. Special features Worm N in Worm Gear 46 + 2 = DP = DP = 8 HUB 7. Style of Gear (A, B, C) Ratio # Leads 6 PROJ.