Gecko 540 spindle control

[martyscncgarage]

Did you happen to see this post on Tuning the VFD?

viewtopic.php?f=63&t=1650

Marty

[martyscncgarage]

Do you have the lathe pro software installed or lathe FREE?
Lathe Pro is required for Constant Surface Speed.

Marty

[Dale Powell]

Would like to get information on the encoder if possible.

[Jdub63]

Marty,

Thanks for the reply. I do have the “Pro” version. I tried tuning the spindle according to your previous post, but I can’t get the Hz to match. I.e. I would like the max RPM to be 1650. I set the VFD freq to 128.35 to get 1650 using the manual VCP but the freq while running was 122.7Hz with 10V output from the Acorn. If I change the freq to 122.7 the RPM drops accordingly. Once I set the Max RPM to 1650 the 100% RPM is ~950 vs the expected 825.

Thanks again for your support, any recommendations would be appreciated

Jdub

[Jdub63]

Would like to get information on the encoder if possible.

Dale,

Attached is the product description of the ring encoder.

Cheers,

Jdub

[Jdub63]

Marty,

As I continue to work through this I was able to get the commanded vs actual speeds fairly close by including a min speed for CNC12 as well as min volts and freq at the VFD.

My problem now as mentioned earlier, is there are no speed changes during the execution of a program. i.e. using the Encoder Pawn example, there are no changes to speed even though the program is commanding a S350, the spindle remains full speed and the output is always 10 volts.

When MDI each command, i.e. M3 S500, M3 S640, etc the system responds as it should.

I've attached a current report from today.

[martyscncgarage]

But you can go into MDI and call M3S500
M3S1000, S1600 etc and it is working?

[Jdub63]

Correct. I’ll make a little video

[martyscncgarage]

Correct. I’ll make a little video

This is only with the PAWN file? Constant Surface speed might be too high for your lathe in the G code file. I "think" its set to 2000rpm

[Jdub63]

Here's a couple of short videos...

I'm a newbie, so I'm not sure of the code, but the Encoder Pawn program starts at S2000 then has a couple of different commands, one of them being S350.

https://youtu.be/hnKkkbZsNcQ

https://youtu.be/CojEQfI_UtQ