Portable TOOL SPINDLES Machinery's Handbook, 31st Edition
1037
ARBORS, CHUCKS, AND SPINDLES Portable Tool Spindles Circular Saw Arbors.— ASME B107.4-2005 (R2011) “Driving and Spindle Ends for Portable Hand, Air, and Air Electric Tools” calls for a round arbor of 5 ⁄ 8 -inch diameter for nominal saw blade diameters of 6 to 8.5 inches, inclusive, and a 3 ⁄ 4 -inch diameter round arbor for saw blade diameters of 9 to 12 inches, inclusive. Spindles for Geared Chucks.— Recommended threaded and tapered spindles for porta ble tool geared chucks of various sizes are as given in the following table: Recommended Spindle Sizes Chuck Sizes, Inch Recommended Spindles Threaded Taper a 3 ⁄ 16 and 1 ⁄ 4 Light 3 ⁄ 8 -24 1 1 ⁄ 4 and 5 ⁄ 16 Medium 3 ⁄ 8 -24 or 1 ⁄ 2 -20 2 Short 3 ⁄ 8 Light 3 ⁄ 8 -24 or 1 ⁄ 2 -20 2 3 ⁄ 8 Medium 1 ⁄ 2 -20 or 5 ⁄ 8 -16 2 1 ⁄ 2 Light 1 ⁄ 2 -20 or 5 ⁄ 8 -16 33 1 ⁄ 2 Medium 5 ⁄ 8 -16 or 3 ⁄ 4 -16 6 5 ⁄ 8 and 3 ⁄ 4 Medium 5 ⁄ 8 -16 or 3 ⁄ 4 -16 3 a Jacobs number. Vertical and Angle Portable Tool Grinder Spindles.— The 5 ⁄ 8 -11 spindle with a length of 1 1 ⁄ 8 inches shown on page 1040 is designed to permit the use of a jam nut with threaded cup wheels. When a revolving guard is used, the length of the spindle is measured from the wheel bearing surface of the guard. For unthreaded wheels with a 7 ⁄ 8 -inch hole, a safety sleeve nut is recommended. The unthreaded wheel with 5 ⁄ 8 -inch hole is not recommended because a jam nut alone may not resist the inertia effect when motor power is cut off. Straight Grinding Wheel Spindles for Portable Tools.— Portable grinders with pneu matic or induction electric motors should be designed for the use of organic bond wheels rated 9500 ft per min (48.25 m/s). Light-duty electric grinders may be designed for vitri fied wheels rated 6500 ft per min (33.0 m/s). Recommended maximum sizes of wheels of both types are as given in the following table: Recommended Maximum Grinding Wheel Sizes for Portable Tools
Maximum Wheel Dimensions
9500 fpm
6500 fpm
Spindle Size
Diameter D
Thickness T
Diameter D
Thickness T
4 5 8
8 -24 × 1 2 -13 × 1
2
1 ⁄ 3 ⁄
3 ⁄ 1 ⁄ 5 ⁄ 5 ⁄ 5 ⁄ 3 ⁄
1 ⁄ 3 ⁄
1 ⁄
1 ⁄ 3 ⁄
8 4 8 8 8 4
2
2 4
2 4
4 8 6 8 8
1 2
1
8 -11 × 2 8 -11 × 3 8 -11 × 3
1 ⁄ 1 ⁄ 1 ⁄ 1 ⁄
… … …
… … …
1
1 ⁄
2
2
4 -10 × 3
Minimum T with the first three spindles is about 1 ⁄ Flanges are assumed to be according to ANSI B7.1 and threads to ANSI/ASME B1.1.
8 inch to accommodate cutting off wheels.
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