I would like to do TURNING using a milling cutter for large diameter cylinders- Rotary Milling. This method is much more faster than normal turning or milling. I can use "variable counter" option, however, in this method, my milling cutter( flat or bull nose) is positioned @ center -part and cutter both and does not give correct/efficient machining. I would like to shift my cutter from the center of cylinder axis(which is also my rotary table axis) and then move down or up parallel to rotary axis. Is the new strategy in NX 9 - cylinder face milling fulfill this requirement ?
Good question. The rotary milling method (as well as some of the other very interesting turning center innovations such as the combination tuning/milling cutters) challenge CAM systems that start from a premise that milling and turning are different things.
As you have already figured out, it will depend on your exact application and require some post processor adaptation in order to get your milling tool to spin during what would otherwise be understood as a turning operation.
In terms of choosing an NX CAM operation that puts your tool in the right spot for you, the first suggestion would be to use a turning teach mode operation which allows for a vertical offset. The other turning operations currently do no support an offset out of the turning plane.
(Thanks to Bob Wijers for his help with this answer)
On the 2013 CIP this was item #22 ("Off center tool path")
If I interpret correctly, it was ranked #16 in voting.
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You can do this with Variable contour.
One method is to set the tool axis to 4-Axis Relative to Part.
Select the Rotation Axis and then enter a Rotation Angle
This will offset the tool based on the Angle
Thanks for your suggestions. I have tried with Lead angle before and got the result. But the method which you suggested would give different offset with different rotation angles. I hope our ME accepts this as solution as there is no direct method to input offset value.
One more question - How can you calculate feedrate while doing "helical" interpolation ? considering cutter and cylinder dia ? Also the helical pitch ? See image
In NX 10 or may be even NX 9.0.3 you can use an offset value for curve drive variable contour operations, if I remember correctly.
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