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Title: |
1921 Article-Acme Machine Tool Co., Horizontal High Speed Drilling Machine |
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Source: |
Machinery, V28, Dec 1921, pg. 329 |
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Insert Date: |
5/21/2016 7:20:55 PM |
In the accompanying illustration is shown a horizontal high-speed drilling machine recently added to the line of machinery manufactured by the Acme Machine Tool Co., Cincinnati, Ohio. This machine is especially adapted for drilling small-diameter deep holes, such as grease-cup holes in king bolts, or similar work requiring quick operation. The design of the machine in general is similar to a hand screw machine, the spindle and chuck operation being the same as on that type of machine. The work is held in an automatic chuck that is opened and closed by operating a lever located at the head end of the bed.
On a turret-slide saddle is mounted a casting that carries the drill spindle. This arrangement permits the machine to be readily arranged for handling long or short pieces. The spindle is ordinarily run at approximately 3000 revolutions per minute, while the work-spindle is run at 500 revolutions per minute. The spindle is provided at the front end with a No. 1 Morse taper socket for holding drill chucks, and is driven from a flanged pulley on the rear end that is connected by means of a belt to a pulley on a countershaft. The spindle and its driving pulley are equipped with bearings, the bearings for the pulley being mounted on a separate stationary sleeve through which the drill spindle passes. This construction relieves the spindle from all belt pull, and permits it to be operated easily and quickly. The spindle is mounted in a sleeve which has rack teeth that mesh with the teeth of a gear on the turnstile shaft. Operation of the turnstile handle moves the spindle backward or forward, while a stop-collar on the rear end of the spindle may be set to stop the spindle movement when a drill has been fed to the desired depth. |
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