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Old 01-24-2015, 10:16 AM
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dpaulson dpaulson is offline
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Default Radius Guage

I know that there are some pretty clever guys out there, so maybe there is someone that can help me out. I want to make a little tool using a depth guage or a dial indicator http://www.ebay.ca/itm/0-22-540-mm-I..._qi=RTM1963932
to calculate the diameter or radius of a circle from a partially rolled metal. I would make an adapter to mount on the dial indicator to a known distance to represent the chord of a circle (in my .pdf would be 4") and using the measured distance (0.2190) and end result will calculate the diameter in this case to be 18.4838. I can use autocad and draw up each time, but I would like to write a VB app to speed things up. I can write the program, but I need help in the background trig needed for these calculations.
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File Type: pdf Radiusguage.pdf (3.5 KB, 192 views)
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Old 01-24-2015, 01:20 PM
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Here's a section from Machinery's Handbook which deals with mathematics. There is a section called "Segments of Circles" on page 80 which should tell you what you need to know. Page 86 has a table of formulas for "Solution of Triangles" which might also help...
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File Type: pdf Mathematics_ya.pdf (893.7 KB, 435 views)
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  #3  
Old 01-24-2015, 03:53 PM
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Got it. I have attached it if anyone wants to use it. It should help to keep the waste minimal when rolling out circles or part circles.
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File Type: zip DiameterCalculator.zip (4.0 KB, 149 views)
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Old 01-24-2015, 05:35 PM
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Saved it. Thanks for the post.
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Old 01-24-2015, 06:28 PM
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Works for me.
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