A-A-50459A
12. Motor. The motor shall be a continuous duty universal series wound or compensated series wound and designed to operate on 115 volt direct current or 115 volt single phase 60 cycle alternating current. Motors shall be in compliance with the requirements of UL 45 for Electric tools for: a. Continuity of grounding connections; b. Insulation resistance; c. Dielectric strength; d. Current input; and e. Temperature rise.
13. Cutting blades. Cutting blades shall be of heat treated alloy tool steel with Rockwell C scale hardness of 57 to 60 for type I shears and 55 to 60 for type II. The reciprocating cutter blades shall be visible to the operator to enable the operator to follow the line to be cut. Cutter blades shall be mounted for convenient adjustment and replacement.
14. Switch. Shears shall provided with a conveniently located switch of quick break design. Self-releasing switches shall return to the *OFF* position when pressure is removed and shall be provided with a locking pin for locking in “ON” position. Switches other than self-releasing type shall be marked to indicated “ON” and *OFF* positions. Switches shall comply with the requirements of UL 45.
15. Wiring. All wiring, flexible cord, attachment plug cap and grounding means shall be in accordance with UL 45. The cord shall have an attachment plug cap and unless otherwise specified, a minimum free length of 9 feet measured from point of entry into the shears.
16. Housings. Housings shall be of material of suitable characteristics to withstand stresses imposed by normal usage. Housings shall include the motor case, gear and cam and reciprocating mechanism housing.
17. Gears and shafts. Gears shall be alloy steel. Where worm gearing is used, the gearing shall consist of a steel worm and bronze worm wheel. Gears shall have machine cut or formed teeth and be designed and supported to efficiently transmit imposed loads. Shafts shall be of alloy steel supported by at least two bearings to prevent deflection. Gears and shafts shall be fully enclosed.
18. Bearings. Armature shafts shall be mounted in ball or roller bearings. Rotating shafts, other than the armature shaft, shall be mounted in ball, roller or needle roller bearings. Reciprocating shafts may be mounted in bronze sleeve bearing. Roller or needle roller bearings which are designed primarily for radial loads shall not be used to absorb trust loads. Steel inserts may be omitted in the mounting of bearings when sufficient contact area and a suitable fit between bearing outer diameter and housing is provided. Bearings shall be of the dustproof sealed type or shall be mounted in a dustproof housing. Ball, roller and needle roller bearings shall conform to ANSI B3.5 for tolerances, B3.6 for dimensions and B3.8 for mounting requirements for the type and size bearings used and (AFBMA Standard Section No. 5) for identification.
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