OO-M-340 Milling, Grinding, Drilling, And Slotting AttachmentThis specification covers an electric motor driven attachment for milling, grinding, drilling, slotting, boring, gear cutting, thread milling, and keyseating operations. The attachment is adaptable for mounting on a lathe, planer, or boring mill. This attachment may also be used as a portable self-contained unit suitable for bench mounting when provided with a feed table.

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OO-M-340F

3.4.5 Interchangeability. All parts shall be manufactured to definite standards, clearances, and tolerances in order that any such parts of a particular type or model may be replaced, interchanged, and adjusted without modification of the replacement parts or any other parts of the unit. When practical, all parts shall be permanently and legibly marked in accordance with MIL-STD-130.

3.4.6 Instruction plates. Instruction plates shall be permanently marked with bold-faced English letters on contrasting backgrounds and shall conform to MIL-STD-130.

3.5 Performance and product characteristics. The basic attachments, with appropriate standard and optional equipment, shall be capable of performing plain and universal milling, drilling, and boring operations through vertically adjustable three axis spindle positioning. The attachments shall be capable of standard keyseating or slotting with the required tooling. Feed for cutting operations shall be obtained from the co-joined machine except as otherwise specified herein.

3.5.1 Capacities. The capacities of the attachments shall not be less than the requirements specified in table I.

TABLE I. Attachment capacities.

Requirement	Size 1	Size 2
Adaptable for use on lathes of (inch) swing	10 to 13	13 to 18
Mounting surface to spindle center (inches)	1-13/16	2-5/8
Vertical adjustment (inches)	5	6
Spindle taper (Morse, ANSI B5.10)	2	3
Range of speed (rpm)	44 to 450	44 to 450
Optional speed range1 (rpm)	540 to 5,500	540 to 5,500
Number of speeds (range)	13 (minimum)	13 (minimum)
Motors (see 3.6.4.1)	1/3 hp 115/230 volts 50/60 Hertz Single phase	3/4 hp 115/230 volts 50/60 Hertz Single phase
Optional motor1		3/4 hp 208/220/440 volts 50/60 Hertz Three phase

1Optional speed range and/or optional motor shall be furnished when specified (see 6.2).

3.5.2 Accuracy. The milling head shall be vertically adjustable and means shall be provided to lock the head at any point along the vertical travel without damaging the guideposts. The vertical adjustment shall work freely through the length of travel without sticking or binding. Locking shall be accomplished without deflecting the tool position more than 0.001 inch. The error in adjustment shall not exceed 0.0005 inch per inch of travel.

3.5.3 Milling with basic attachment. The basic attachment, when mounted on a suitable lathe, shall permit the following operations within the specified tolerances.