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Radius measuring tool

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dvbydt:
I don't know if it helps any, but if my maths is right, then if the sin of the half angle is 3/5, we are dealing with a 3,4,5 right angled triangle. Therefore setting up a sine bar to 36.89 degrees is straightforward.

Ian

dvbydt:
Sorry Bill you got there already!

Ian

BillTodd:

--- Quote ---I don't know if it helps any, but if my maths is right, then if the sin of the half angle is 3/5, we are dealing with a 3,4,5 right angled triangle. Therefore setting up a sine bar to 36.89 degrees is straightforward.

--- End quote ---

 :clap:


--- Quote from: dvbydt on November 09, 2015, 07:45:38 AM ---Sorry Bill you got there already!

Ian

--- End quote ---

Reminds me of the constipated mathematician who worked it out with a pencil  :D

BillTodd:
Sine bar setting on my Horizontal mill (as an example)

[edit] There is one caveat with this tool: the included angle is <90 so it cannot as designed measure corner radii. 

sparky961:
Slightly OT but related nonetheless... 1-2-3 blocks, in my experience are very accurate on size and parallelism of like faces. DO NOT under any circumstances assume they are square though!

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