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### Messages - romeo_tango

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##### General Mach Discussion / Re: PLEASE HELP - How to set feedrate for mixed linear and rotary axes?
« on: June 05, 2010, 06:20:01 AM »
Thanks Graham, but how would you write such G-code by hand? For example, if I wanted to move XYAB axes simultaneously from any arbitrary position to any other at a known tool feed-rate, can you give me an example of how I would write the code? Let's assume the A & B pivot points are both 100mm away from the distal end of the axis arm and the tool-tip respectively.

My client, who is using this machine, uses it to engrave tyre mould segments. He later bolts the segments together on to a former to give the full tyre mould. He uses a CAM system to generate the G-code, but that doesn't seem to work ok with my controller. A Siemens 802D system installed a few years earlier on a similar machine, required 2 months and an expert to fly in to work exactly this problem out, so that the CAM system could effectively be used with the machine.

Do you think, we could work out the circumference described by the distal ends of the rotary axes, and convert the rotary axes to linear and map the circumference calculated, to linear motion, in effect carrying out a Mercator's projection of a globe on to plain paper?  The Siemens system has specified all axes as linear - is there something in that?

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##### General Mach Discussion / PLEASE HELP - How to set feedrate for mixed linear and rotary axes?
« on: June 05, 2010, 03:02:16 AM »
Hi all!

I have connected a CNC system built around Mach3 .042, to a machine which has 2 linear axes and 2 rotary axes. The linear axes have velocity set in mm/min and the rotary axes in degrees/min.

If I use G1 with an F-word, while invoking a linear axis, I know I'm talking of mm/min. When I invoke motion in a rotary axis alone, I know I'm talking of degrees/min. But how do I reconcile the F-word in multi-axis motion? For example, how do I make sense of this G-code scrap:
G1 X100 Y102 A23.2 B35 F100
where X and Y are linear axes; A and B are rotary axes.

How does the F-word work here? What does it mean in the above scrap? How do I generate Gcode from a CAM software for this?

Rajiv

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