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Topics - zhitomirjohn

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Wizards now seem to be appearing that will find the centre and radius of a circle from three points on a arc.  Can anyone help with the maths for this so that I can create the appropriate G code. 

Is it possible to produce a modified centre finder in the shape of a sword, whereby the tips of the handles touch the arc at a fixed distance apart and the top of the handle slides to touch the arc. A datum line at centre of the sword then gives a reading of the radius and hence you have the centre and radius.  A depth micrometer could possibly be modified.  I do need the maths to try this though as I presume that the scale will be non-linear.
John

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