Index SECTION K SYNCHRONOUS DRIVES

Stock Timing Pulleys STOCK TIMING PULLEYS ′ ′ 1/5′′ - 7/8′′ PITCH QD — TAPER BUSHED AND STOCK BORE Taper Bushed Stock Bore PITCH IN. ⁄5″ PULLEY DESIGNATION Martin Timing Pulleys are manufactured to extremely close specications and are stocked in minimum plain bore, Taper Bushed and Q.D. bushed styles depending on size and pitch. See tables for stock pulley types. Bushings are priced separately and must be added to pulley price. Illustrations below indicate stock pulley construction type listed in tables. “F” designation in pulley type means pulley is anged. When drive center distance is eight...

Timing Pulley Terminology Timing belts and pulleys — in order to handle a wide range of loads, speeds and applications at highest possible efciencies — are made in ve stock pitches. Circular pitch (usually referred to as pitch) is a basic consideration in the selection of timing pulleys as with gear and chain drives. Pitch is the distance between groove centers and is measured on the pulley pitch circle. On the belt, pitch is the distance between tooth centers and is measured on the pitch line of the belt. The pitch line of the belt is located within the tension member and coincides with the...

Timing Pulley Terminology Timing Pulleys Timing pulleys have evenly spaced axial grooves cut in their periphery to make correct, positive engagement with the mating teeth of the belt. These pulleys are designed so that the teeth of the belt enter and leave the grooves with negligible friction. All pulleys, stock and made-to-order, have minimum tooth-to-groove clearance (backlash). The pulley’s pitch diameter will always be greater than its outside diameter. Pulleys are available in a wide range of stock widths and diameters. Minimum Pulley Diameters pitch recommended minimum* pitch diam. in....

Stock Timing Pulleys Type AF Dash 1 = Solid Style Dash 2 = Web Style Dash 3 = Arm/Spoke Style “F” type description indicates anged. XL 037 For Belts 1⁄4″ and 3⁄8″ Wide Minimum Plain Bore No. Teeth Part Number Pitch Diam. Note: XL Pulleys stocked min. plain bore with 2 setscrews @ 90˚. If keyway is used, reduce max. bore by twice keyway depth. Pulley O.D. = P.D. – .02″.

Stock Timing Pulleys L050 For Belts 1⁄2″ Wide Minimum Plain Bore Part Number L Pulleys 10 - 16 teeth min. plain bore stocked with 1 set screw. If keyway is used, reduced maximum bore by twice keyway depth. Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .03″ L050 For Belts 1⁄2″ Wide (3⁄8″ Pitch) QD Type No. Teeth Part Number Pitch Diam. Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .03″ *Reverse mount drilled only +Bushing Projects 1⁄16 on Small End. Bore Range L050 Taper Bushed on Page K7

Stock Timing Pulleys Type CF L050 For Belts 1⁄2″ Wide (3⁄8″ Pitch) Taper Bushed Type Part Number Dash 1 = Solid Style Dash 3 = Arm/Spoke Style Pitch Diam. Bore Range Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .03″ L075 For Belts 3⁄4″ Wide (3⁄8″ Pitch) Minimum Plain Bore Part Number Pitch Diam. Dimensions in inches. Weight in pounds. Pulley O.D. = P.D. – .03″ L Pulleys 12 - 16 teeth min. plain bore stocked with 1-SS. If keyway is used, reduce maximum bore by twice keyway depth.

Stock Timing Pulleys L075 For Belts 3⁄4″ Wide (3⁄8″ Pitch) QD Type Part Number Pitch Diam. Bore Range Bore Range Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .03″ *Reverse mount only L075 For Belts 3⁄4″ Wide (3⁄8″ Pitch) Taper Bushed Type No. Teeth Part Number Pitch Diam. Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .03″

Stock Timing Pulleys L100 For Belts 1″ Wide (3⁄8″ Pitch) Minimum Plain Bore Part Number Pitch Diam. Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .03″ L Pulleys 14 - 16 teeth min. plain bore stocked with 1-S.S. If keyway is used, reduce maximum bore by twice keyway depth. L100 For Belts 1″ Wide (3⁄8″ Pitch) QD Type Part Number Pitch Diam. Bore Range Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .03″ *Reverse mount only

Stock Timing Pulleys Dash 1 = Solid Style E Dash 3 = Arm/Spoke Style K “F” in type description indicates anged. L100 For Belts 1″ Wide (3⁄8″ Pitch) Taper Bushed Type No. Teeth Part Number Pitch Diam. Bore Range Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .03″

Stock Timing Pulleys H100 For Belts 3⁄4″ and 1″ Wide (1⁄2″ Pitch) Minimum Plain Bore F = 15⁄16 Bore Part Number Pitch Diam. Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .054″ H100 For Belts 3⁄4″ and 1″ Wide (1⁄2″ Pitch) QD Type F = 15⁄16 No. Teeth Part Number Pitch Diam. Bore Range Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .054″ *Reverse mount only

Stock Timing Pulleys Dash 1 = Solid Style Dash 3 = Arm/Spoke Style “F” in description indicates anged. H100 For Belts 3⁄4″ and 1″ Wide (1⁄2″ Pitch) Taper Bushed Type F = 15⁄16 No. Teeth Part Number Pitch Diam. Bore Range Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .054″

Stock Timing Pulleys Type AF Dash 1 = Solid Style Dash 3 = Arm/Spoke Style “F” in type description indicates anged. H150 For Belts 11⁄2″ Wide (1⁄2″ Pitch) Minimum Plain Bore Part Number Pitch Diam. Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .054″

Stock Timing Pulleys H150 For Belts 11⁄2″ Wide (1⁄2″ Pitch) QD Type No. Teeth Part Number Pitch Diam. Bore Range Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .054″ *Reverse mount only H150 For Belts 11⁄2″ Wide (1⁄2″ Pitch) Taper Bushed Type No. Teeth Part Number Pitch Diam. Dimensions in inches. Weight in pounds Pulley O.D. = P.D. – .054″ Bore Range