A-A-50055
Knives. Knives shall be fabricated from steel, shall be removable, and shall be ground flat on the side which contacts the end plate. Knives shall have a Rockwell “C” hardness between 45 to 60.
End palte. End plates shall be fabricated from steel and shall have a Rockwell “C” hardness between 45 to 66. End plates shall mate with, and lock into, the housing and shall not rotate during operation. They shall be secured by a locking ring which can be easily tightened and removed.
Feed worm. The feed worm shall be removable from the machine body.
Motors. Motors shall have an ambient temperature rating of 400C, be totally enclosed or drip proof, and rated for continuous duty, with over-current protection.
Operator platform. When specified, item 2 or 3 shall be furnished with a platform to facilitate operator access to the hopper. The platform shall be fabricated of aluminum, stainless steel or galvanized steel. The platform shall be 18 to 20 inches from the floor and shall be approximately 20 by 37 inches. An intermediate step and a 35 inch high guard rail on one side and one end shall be provided. The platform and step shall have a safety thread. The structure shall be stable with an operator standing on it.
Detailed requirements.
Item I grinders shall conform to the requirements of table I. Size 8 grinders shall be designed for counter top use and sizes 20, 30, and 50 shall be designed for floor mounting. Size 8 grinders shall have four legs or be designed for sealing to a bench or table top. Size 20, 30, and 50 grinders shall be mounted on four legs so that the centerline of the end plate is 28 + 1 inches above the floor. A meat stomper and a stainless steel meat pan shall be furnished with each grinder. The pan for size 30 machines shall have a minimum capacity of 75 lbs of meat. The pan for size 50 machines shall have a high back and a minimum capacity 125 lbs of meat. The stomper shall be constructed so that it cannot contact the feed worm. Motors for size 8, 20and 30 grinders shall have motor circuit switches while the motor for size 50 grinders shall have a magnetic, across-the-line contactor breaking all incoming lines with start-and-stop control and overload protection. Size 8 grinders shall be provided with 3 wire, 6 foot cords and NEMA 5-15P attachment plugs. All other sizes shall have provisions for permanent connection to the power supply.
Item 2 grinder-mixers shall conform to the requirements of table I. The agitator shaft shall be removable for cleaning. The mixing hopper shall have a minimum capacity of 200 lbs and shall be provided with a hinged lid and a means for holding the lid in fully open position. A safety interlock shall cut power to the unit when the lid is raised 1/8 inch
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