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Comparator Chart Layout Fixture

IP.com Disclosure Number: IPCOM000098499D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Fletcher, RQ: AUTHOR

Abstract

In laying out charts for use on a comparator, extremely close tolerances must be maintained as the charts are enlarged many times.

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Comparator Chart Layout Fixture

In laying out charts for use on a comparator, extremely close tolerances must be maintained as the charts are enlarged many times.

The drafting fixture provides a high degree of accuracy. The base is a surface plate 10 on which a sine bar base 11 is supported by bars 12 and 14. Base 11 has a bearing block 13 formed on it to support a stub shaft 15 on which is secured a plate or disc 16.

Notches (not shown) formed in shaft 15 are located 15 degrees apart and are engaged by a spring pressed plunger 17 to index the rotation of shaft 15. A sheet of a tracing media which shows a mark when written on by a blunt scriber is secured to plate 16 by tape or other means. A scriber 20 is mounted in a vernier type height gage 21 which when moved across the plate 10 draws a line. By indexing plate 16 any line may be drawn at angular increments of 15 degrees to the first line. In order to draw a line at an angle less than 15 degrees the bar 14 is changed thus tilting the horizontal axis of shaft 15 from its original position. A vernier caliper 22 is used to draw arcs.

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