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Title: |
1921 Article-Production Machine Co., Grinding & Polishing Machine |
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Source: |
Machinery, V28, Sep 1921, pg. 72 |
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Insert Date: |
5/22/2016 8:04:30 PM |
A combination machine designed to handle the work of a disk grinder, a polishing wheel, and a belt-surfacing machine and which, in addition, can be converted into a double-spindle buffing machine or into a light snagging grinder has been developed by the Production Machine Co., Greenfield, Mass., and is known as the “Type R." This machine is adapted for a wide range of work, and the construction is such that three operators may work simultaneously without interfering with one another. The base and head are cast integral, so as to supply the necessary rigid support for the spindle and its bearings.
The spindle is equipped with Timken roller bearings, and these are packed in grease and sealed from dust. On one end of the spindle is mounted a double-faced disk grinding wheel, and on the other end, a patented leather cushion wheel over which an abrasive belt runs. This wheel, together with the belt, is used for a variety of polishing operations. The belt is 6 inches wide, endless, and kept under the proper tension by means of a swinging idler pulley. A table is furnished for use in surfacing operations, and this is equipped with an adjustable rest that facilitates the handling of articles having straight or angular edges. This rest is so hinged that it may be quickly swung over the back of the machine when it is necessary to change the abrasive belt. The idler arm is arranged with a latch, so that the idler may be lifted off the belt and held in a raised position while the latter is being changed.
The double-faced disk wheel is reversible. A table is provided for supporting work being ground on this wheel, the table having a rocking seat which enables the supporting of angular work. The table has a vertical adjustment and a circular adjustment on the holding post. The machine is equipped with four holding posts, two in the front and one on each side and these posts adapt the machine for the application of a variety of fixtures. Some of the principal dimensions of the machines are as follows: Diameter of disk wheel, 15 inches, dimensions of disk-wheel table surface, 9¾ by 8 inches; leather cushion wheel, 14 inches in diameter and 6 inches wide; and surfacing table, 14 by 6½ inches. The spindle speed is 1200 revolutions per minute and the surface speed of the abrasive belt, 4760 feet per minute. |
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1921 Production Machine Co., Grinding & Polishing Machine
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