OO-M-340F
3.5.3.1 Woodruff keyseat cutting. The basic attachment shall be capable of cutting Woodruff keyseats of the sizes specified below in 1020 steel round bar stock mounted between lathe centers in not more than five minutes for each cut. One keyseat shall be cut 1/4 inch from the end of the bar to the keyseat center. A second keyseat shall be cut at the midpoint of the bar. The cuts shall be free of chatter marks.
a. Size 1 - No. 204 Woodruff cutter, bar size 3/4 inch diameter by 6 inches long. b. Size 2 - No. 406 Woodruff cutter, bar size 1 inch diameter by 8 inches long.
3.5.3.2 Keyway cutting. The basic attachment shall be capable of cutting keyways of the sizes specified below in one continuous operation in 1020 steel round bar stock, 30 inches long, mounted between centers.
a. Size 1 - 1/2 X 1/4 X 25 inches long at 1-3/4 inches per minute (ipm), bar diameter 2 inches. b. Size 2 - 3/4 X 3/8 X 25 inches long at 1-1/2 ipm, bar diameter 3 inches.
3.6 Components. The attachments shall consist of the following principal components.
3.6.1 Base and column assembly. The base and column assembly shall consist of, but not be limited to, guideposts and a vertical adjusting screw. The base plate shall be adaptable to the lathe and shall provide rigidity for the guideposts. A vertically adjustable lead-screw shall be furnished, mounted on anti-friction thrust bearings with take-up for end play, and engaged by anti-backlash nuts in the sliding casting. The lead-screw shall be of hardened alloy 4140 steel or equivalent and shall have precision threads. The threads shall be uniform and have sufficient length of engagement to ensure the adjusted positional accuracy specified in 3.5.2. The lead-screw shall be turned by a hand crank and shall be provided with an adjustable collar graduated in increments of
0.001 inch that can be read continuously through the zero position.
3.6.2 Basic milling head. The basic milling head shall consist of a housing casting, spindle, gear drive, and motor support. The milling head shall be machined to house the spindle and gear drive assembly and to provide for motor attachment, guide posts slide, lead-screw, and positional clamps. The outer rim of the machined surface shall be graduated in increments of one degree for
30 degrees on each side of vertical zero. The spindle shall be hardened to Rockwell C45 to C52 and be precision ground, with the taper in the spindle nose conforming to ASME B5.10 and table I. The spindle and gear shafts shall be mounted on ball or roller bearings. All gears shall operate in an oil bath sealed to prevent entrance of foreign matter or leakage of oil when turned or rotated to any angle. The milling head shall provide for attachment of the drive motor directly or by motor mount. The main spindle shall provide for positive drive for all side mill, end mill, shell end mill, angle mill, and fly cutter arbors.
3.6.3 Belts and pulleys. When applicable, V-belt drives shall be furnished in accordance with RMA IP 25. Pulleys shall be of cast iron or aluminum alloy and shall be balanced. A belt guard shall be provided for protection of the operator at all positions during metalworking or grinding operations.
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