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Title: |
1892 Article-Pratt & Whitney Co., Milling Machines |
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Source: |
Modern Machine Shop Practice, V2, 1892, plate V |
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Insert Date: |
12/10/2013 1:31:16 PM |
Fig. 1, Plate V., represents a milling machine by the Pratt and Whitney Company, the construction being clearly shown in the cut, in which it will be seen that the frame is of the box form and very rigid, and an outer bearing is provided for the end of the cutter spindle. Both heads are adjustable for height from the work table and may be rigidly bolted in their adjusted positions.
Fig. 2 represents another machine by the Pratt and Whitney Company of new design.
The work is bolted on to the face plate shown in the cut, or an outboard bearing corresponding to the tailstock of a lathe may be provided and the work supported at that end also. The cutters are driven from the head, having the cone pulley with three changes of speed.
The rate of revolution of the work is that necessary for the feed.
As an example of the great usefulness of this machine, suppose a blank for a gear wheel to be chucked on the face plate, and then a set of milling cutters may be employed to face up the blank and dress both the edges at the same time.
This machine really supplants the lathe for a large class of work, requiring less attention and being more accurate. |
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1892 Pratt & Whitney Co., Milling Machine
1892 Pratt & Whitney Co., Milling Machine
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