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English and Metric Adjustment Readout for an English Leadscrew Machine

IP.com Disclosure Number: IPCOM000081584D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 52K

Publishing Venue

IBM

Related People

Brown, AB: AUTHOR

Abstract

This device enables a machine tool operator to selectively adjust an English leadscrew machine in accordance with English or metric dimensions. In addition, a leadscrew revolution counting dial is step controlled by the movable dial bearing the metric dimensions, to enable the operator to read metric dimensions which are greater than one leadscrew revolution.

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English and Metric Adjustment Readout for an English Leadscrew Machine

This device enables a machine tool operator to selectively adjust an English leadscrew machine in accordance with English or metric dimensions. In addition, a leadscrew revolution counting dial is step controlled by the movable dial bearing the metric dimensions, to enable the operator to read metric dimensions which are greater than one leadscrew revolution.

Fig. 1 shows handle 10 of a machine tool. This handle is directly attached to leadscrew 11 such that one revolution of the handle produces one revolution of the leadscrew. The leadscrew 11 carries English dimension threads.

Dial 12 is directly attached to handle 10. This dial carries English measurement indicia which cooperate with stationary disc 13, whose indicia 14 facilitates English adjustment readout of dial 12. When the operator seeks to adjust the leadscrew 11 for a specified English measurement, it is necessary to count the revolutions of the handle (if more than one) and to read dial 12.

A second movable dial 15 carries metric measurement indicia which also cooperate with indicia 14. This dial is gear driven from dial 12 so that its movement, relative to indicia 14, enables readout of metric leadscrew movement achieved by rotation of the handle 10 and the English leadscrew 11. A third movable dial 16 moves in steps of one increment for each revolution of metric dial 15. Thus, dial 16 comprises a revolution counter for dial 15.

Fig. 2 shows an exploded view of the three dials and the disc, also showing disc 13 offset and reversed. As seen in this view, English dial 12 includes an interval ring gear 17. The gear teeth carried by this ring gear are nonstandard. Specifically, the ring gear carries 127 teeth of 48 pitch, having a 2.605-inch pitch diameter.

Stationary disc 13 rotatably carries a spur gear 1...