Schaublin 125-CNC retrofit.

Thanks for your help guys. And a big thanks to Andy for doing the lathe macros. That is a really nice conversational interface.

I now have it up and running. That last UI update has the button visible, and corrects the input field sizes.

I have a half-arsed rough spindle scaling set up, but am getting to the point where I have to stop procrastinating, and sort out my over complicated spindle control algrythm.

 

RotarySMP wrote:

I have a half-arsed rough spindle scaling set up, but am getting to the point where I have to stop procrastinating, and sort out my over complicated spindle control algrythm.


 

I remember some discussion a while back about how best to control the variator vs. VFD.  Did you ever sort out the philosophy or goal (for lack of better tems)?  i.e.

• Variator at max reduction possible
• Raise vfd from there to meet target rpm
• Adjust variator if VFD would exceed some frequency

Just curious what you worked out.

So far haven't got beyond thoughts and aspirations to implementation yet.

I think I will run the variator open loop with dead reckoning. Basically one of 4 ratios, with one second of "speed up" or "slow down" command between ratios.

My rough concept would be:
- While stationary, based on the commanded speed, the back gear is selected between 1:1 and 1:7.
- start spindle
- set the variator to nearest ratio
- VFD runs closed loop to control the commanded speed.

On CSS Facing cuts, each time the VFD commanded voltage reaches it's limit up or down, the variator is commanded to change gear.

Since I cant program in C, I would like to do this in classic ladder. I don't have much idea of how I will actually achieve that either, hence the procrastination. That I am good at
Cheers,
Mark
 

Maybe someone will write you a "2+infinity+infinity.comp"

Seriously... here's a gent who duplicated the Fadal 'pozi-drive' two-speed belt w/VFD system on his mill:

[url] github.com/PeterMue/ZX45-LinuxCNC [/url]

Doesn't have everything you need, but may save some time during the thinkin' phase.

Thanks for the link.
On the Maho a friend of mine who is a professional programmer wrote the gearbox comp. Although a wrote the spec and drew a flow chart of what it needed to do, I suck at coding, and can't really follow it to modify it , and my friend got too busy.

I kind of want to see if I can do it in classic ladder, as it seem more intuitive to me than C.

Thanks for your help guys, and especially to Andy for those lathe macros. Brilliant.



Cheers,
Mark