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Dear Friend,
In case if you have to turn one full rotation for 16 inches : You first plot a graph where "X" axis is the distance and "Y" axis being the angle of rotation in degrees. The extreme point on "X" axis is 16 inches and the corresponding extreme point on "Y" axis of the graph is 360 degrees. Join the straight line between (0,0) and (16,360).
Now you find where you will have to stop machining on "X" axis of your graph. Mind well Here "X" axis of the graph is actually the traverse of the tool in your machine "Z" Axis. So, for example you choose to stop at 6 inches then draw a vertical line starting from 6 inches on your "X" axis of the graph; let it cut the plotted curve(in this case it is a straight line), find the corresponding co-ordinate on "Y" axis. This reading of "Y" axis on the graph is actually the angle of rotation at which you have to stop.
In other words, you can find any C-Z interpolation value that you want from this graph. Once you understand this straight line relationship, then you can change your C-Z values as you want.
Only thing you have to make clear in your mind is : The graph is true for the given pitch (i.e. distance in one revolution). As you can understand that in case if the component length is much less that the pitch then you can plot this graph and decide as to where to stop i.e. limiting C-Z values.
Best of luck,
Jasmin Shah
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