mach3 Post Processor with G93 Inverse Time Feed Rate in Fusion 360

[alessiol]

Hi guys! 

Question. I am playing with teh 4th axis and the only option I see in the mach3 mill post porcessor is to locate the axis of rotation. The problem is that i also need the inverse time feed rate when multiple axis are on the same line of the gcode or the A axis will move too slow. I tried with the in built FANUC -Inverse Time and A-axis post processor and seems to work. I was wondering if someone knows or can share a Mach3 mill customized post processor with the inverse time activated. I see that if you open conf. you can edit the post porcess whihc seems to have the inverse time already in but I do noy know how to set it up correctly.

Thanks for the help! IF someone has the modfied post processor for mach3 please let me know!

Ciao ciao,

Alessio

[prettygoodnotbad]

Thanks for all that info, I'm looking at my version and it seems to be up to date with latest version posted online, strangely though it seems to be 3.043 not 3.46.

Otherwise I couldn't find the radius compensation setting, is it in one of the menus? Thats one of the things I'm wondering about my macro for mach3 it looks like the removed a few of the settings available on the DRO. 

Out of curiosity, if you lets say run something more straightforward than the gear you posted, like just a cylindrical rod, does your A axis rotate in really jerky movements? G93 posts different speeds for every line of code, which I also find kind of odd.

[alessiol]

No you are right the latest version is Version R3.043.066. I remembered some 66 in the version, but apparently in the wrong spot 🙂

So software wise you should be fine. Please check the attachment and set it up in the same way. You go in setting tab and define A (if it's where you have the 4th axis) as 0.0001. THe smaller number it can take. Then in the main window you will seee the radius corection on. Then set the Z0 at the center piece level. 

I made other stuffs, not just gear and my 4th axis moves really smoothly. Make sure that you have the setting correct as well. It still showup as a step/rev but you have to intend them as rev/minutes. It's different ( in attached mine as well with a 1:50 reduction. Sicne the machine is not connected the actual motor curve is worng but just to give you an idea about the value). How I calculated my 111.111:

(Motor 1 lap pulses (in most case 360/1.8^ = 200) x Driver fine fraction (4 in my case, read on the driver) x Reduction ratio (50 in my case, based on your 4th axis pulleys, gears, worm gearbox or harmonic drive) ÷ 360 --> (200 X 4 X 50)/360 = 111.111

For the actualy speed then set it way faster like 6000 or 7000 and see if the 4th axis can take it.

Let me know if it helps.