[THend]

Ok, been running a 4 axis foam cutter for years using a canned software.

I've recently been running a nice 3D router with Mach3.

Now, I've purchased upgrade electronics for the 4 axis foam cutter and will have bipolar setup.

I want to run G-code now to cut wings. This means that the horizontal axis will have to run at different feedrates, and so will the vertical axis. I want to be able to block the foam with rapid moves etc... then slow everything down for the airfoil cut.

Where do I start? I've been playing with 3 axis g-code for a little while so I am a tad familiar with how it goes.

I need to control the feedrate of each axis independanlty and at the same time.

How? Help?

[Eurisko]

This could be a problem.

Let's suppose you're feeding in two axes simultaneously, and that each axis has its own feedrate. Let's also assume that the X axis is feeding twice as fast as the Y axis.

G90 G00 X0. Y0.
G01 X10.0 Y10.0

What should be one 45 degree line becomes TWO lines.
(0,0) to (10,5)
(10,5) to (10,10)

The X axis will reach its target twice as fast as the Y will.

[THend]

I have learned something....

I now understand how it works, I didn't before, so my question itself was stupid.

All axis arrive at their destinations at the same time. Then acquire next destination.

Love it when the lights come on.

[Eurisko]

Your question wasn't stupid at all.

You were 'thinking outside the box' and that's good!

You can change the feedrate anytime you want. Use a fast feedrate for blocking the foam, then slow the feed down for the arcs.

G90 G00 X0. Y0.
G01 X5.000 F75.0 (fast feed for linear move)
G03 X0. Y5.000 I-5.000 J0. F10.0 (slower feed for arc)