hi
I am trying to apply the math in my references to come with a sag chart for cutting tools. When I compare to the one I got from Coburn it is apparent that they are compensating for the angle that the lap contacts the ball on the sag guage. It seems that this value changes the width of the bar by some amount. Can anyone give me some insight into how this is calculated. I am using a 40- mm sag guage that came with my lensmaker
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