|
Title: |
1892 Article-Albert L. Colburn, Universal Swing Frame Grinding Machine |
|
Source: |
American Machinist 25 Feb 1892 pg 5 |
|
Insert Date: |
12/26/2011 7:45:20 PM |
Universal Swing Frame Grinding Machine — The accompanying illustration is of a universal swing frame grinding machine, which is adapted for all that class of grinding in which the utmost freedom of movement of the wheel is necessary, and which usually cannot be done by the ordinary grinding machines.
As is well known, it frequently happens that dies for drop-forging or stamping hollow ware are badly sprung in hardening, and it is sometimes necessary to either grind them to shape by hand, or, where badly sprung, to anneal them. The machine herewith illustrated is intended to enable such dies to be ground to shape rapidly and expeditiously wherever such a method is possible, and to this end the wheel is mounted at the end of a spindle in such a way that it can be applied to the die in any possible shape while rapidly revolving, the die remaining stationary upon the bench.
The machine consists essentially of a countershaft from which a belt runs to a suspended pulley, which is hung in a frame and counterbalanced in such a way that it can be moved in an arc of a circle, the center of which coincides with that of the countershaft.
This admits of any desired vertical movement, while at the same time the spindle is so connected to the frame above as to be at a constant distance from it, and the tension of the round belt which runs from the suspended wheel to the spindle pulley is maintained constant, being adjusted by the sliding joint seen in the vertical rod. The arrangement of the grinding spindle pulley and idler pulleys is such that the belt runs freely and without cramping in any desired position. The bearings for the spindle constitute the handles by which it is guided and applied to the work. The end of the spindle is provided with a taper hole into which arbors can be fitted in the ordinary way, so that holes of any desired form may be used; or, where it is desirable, small milling cutters or burrs can be substituted. The machine is manufactured by Albert L. Colburn, 4 Wall Street, New Haven, Conn. |
|
1892 Albert L. Colburn, Universal Swing Frame Grinding Machine
|
|