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Title: |
1911 Article-Cincinnati Bickford Tool Co., Heavy Pattern Verical Drill Press |
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Source: |
Machine Tools Commonly Employed In Modern Engineering Workshop, V2, 1911, pgs. 9-11 |
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Insert Date: |
4/13/2020 8:35:07 PM |
A Cincinnati Drilling Machine with Sliding Head
Fig. 232 is an illustration of a 21-in. Cincinnati drill, fitted with a sliding head, friction back gear, patent positive-geared feed, and an automatic stop and quick-return motion.
A separate view of the sliding head, showing the arrangement of the positive-geared feed and the quick-change feed-box, is illustrated in fig. 233, this device being generally fitted to machines of 21 in. and heavier sizes. Six spindle feeds are obtained by suitably operating the handle of the feed-box, conveniently situated on the sliding head, and an index attached to the handle clearly registers the feed in thousandths of an inch per spindle revolution. With this positive arrangement no feed-belt is used, and to change the feed the operator is not obliged to reach to the top of the machine. On the 24-in. machine, feeds of from 6 to 39 thousandths of an inch per revolution are obtainable; a range sufficiently wide for all drilling, boring, and reaming operations within the capacity of the machine.
The same illustration shows the graduation of the spindle sleeve and the automatic trip gear, by means of which the feed is disengaged when the spindle has travelled to the required depth. On the sleeve there is mounted an adjustable collar, which can be set to the scale indication corresponding with the desired depth. When the drill reaches this depth the projection on the collar releases the trip-gear levers shown in the illustration and disengages the feed worm which drives the spindle sleeve. |
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1911 Cincinnati Bickford Tool Co., Heavy Pattern Verical Drill Press
1911 Cincinnati Bickford Tool Co.-Sliding Head for Verical Drill Press
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