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Title: |
1921 Article-Geometric Tool Co., Bench Threading Machine |
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Source: |
Machinery, V28, Sep 1921, pg. 74 |
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Insert Date: |
5/23/2016 2:35:44 PM |
A bench threading machine equipped with a Geometric rotary die-head for the cutting of fine-pitch threads of from 1/16 to 5/16 inch in diameter is here illustrated. This machine has just been introduced by the Geometric Tool Co., New Haven, Conn. The bed consists of a single casting and has a spindle mounted in bronze bearings. This spindle is driven through a three-step cone pulley and carries the rotary die-head at its inner end. The die-head is operated by a yoke lever and trip-rod. Adjustable stops conveniently arranged on the trip-rod govern the opening and closing of the die-head. It is opened with a forward movement of the carriage and closed with a backward movement.
The carriage is equipped with a two-jaw chuck operated by a hand-wheel, but collets, expanding arbors, or special holders can be furnished when the work requires such accessories. An adjustable swinging stop on the side of the chuck enables the accurate setting of work for the cutting of a thread to a predetermined length. The carriage is mounted on a round bar on which it is guided by a large bronze key that engages a keyway on the bar. An adjustment is provided for maintaining the proper fit of the carriage on its support. This construction facilitates the removal of chips from the bed of the machine. Oil from the reservoir in the bed is forced through the spindle and against the work by a geared pump having a direct drive from the spindle. The cone pulley furnishes proper spindle speeds for the rated capacity of the machine.
Different sets of chasers are required to cover the threading range of the machine and these may be readily removed from their slots after the die-head has been tripped and the stop plunger pulled out. Identification numbers are placed on the chasers and their corresponding slots to insure the correct assembly of the chasers. This machine is arranged for bolting to a bench, or it may be mounted on a separate pedestal for floor use. Some of the specifications are as follows: Maximum length of thread which can be cut at one setting, 3¼ inches; with resetting’s, 18 inches; bench space required 9½ by 29 inches; weight without pedestal,90 pounds; and with pedestal, 175 pounds. |
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1921 Geometric Tool Co., Bench Threading Machine
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