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When you are milling a shape with live milling on a lathe using polar interpolation (lathe does not have Y axis), how do you figure feedrate? It does not seem to be plain IPM.
OR wait....are you just saying you have to watch out when getting close enough to X0. that you are exceeding the max C-axis feed rate???
Hello munruh,
The Feed Rate in Polar Interpolation will vary (C or X depending on the mode of feed rate) depending on how close the cutter is to the centre of the part. For the same length of Linear Interpolated move (X and C together), the C axis will move through a greater angle the closer the tool is to the Centre in the X axis. For example, a line of 43.489 length, Linear Interpolated in one axis (combination of X and C to give the appearance of one axis), at Diameter 90.0 the C Axis will move through 51.684deg. At Diameter 20.0, the C axis angular move will be 130.706deg. Because of this, an alarm is raised if the C Axis Feed exceeds a max value set in parameter. Accordingly, when determining the feed rate to use, the relative position of the tool to the spindle centre in X must be taken into consideration. One feed may not fit all.
Regards,
Bill
Thank you, Is there a formula for figuring this?
Thank you, Is there a formula for figuring this?
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