Remora - ethernet NVEM cnc board

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05 Sep 2023 15:40 #279994 by tuxcnc

Dropped my accuracy down to 0.0005mm per step about 10,000 pulses per per full rotation being 5mm.
 

I never seen your machine, but I don't believe that any amateur CNC has real accuracy better than 0.01 mm...

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05 Sep 2023 15:44 #279996 by GeramyL
Haha i know right, but its more about resolution not about accuracy. If you move at 0.01 movements with a stepper motor it wont be smooth, it will be very jagged, where a servo and may i say are beautiful, would work great with lower resolution because they dont step they are constant. When you lower resolution on a stepper you get less smooth movements at least from my experience, I do have smooth stepping enabled on my drivers which are super high quality drivers with tuning and rs232 but you can only get so much out of steppers.

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05 Sep 2023 15:52 - 05 Sep 2023 15:57 #279999 by cakeslob
remora-docs.readthedocs.io/en/latest/sof...indle-control-simple

Im not seeing a config example in the nvem repo, but here is how we are doing it otherwise.

Change remora.SP.x to what ever is in your config, and adjust the gain to spindle rpm. I think it works out to 100/24000 . another user did this the other day, here is a snippet from his config


# spindle setup
loadrt scale count=1
addf scale.0 servo-thread
setp scale.0.gain 0.00416 #this will make m3 s24000 give 100% output and m3 s2400 10%
net spindle-speed-scale spindle.0.speed-out => scale.0.in
net spindle-speed-DAC scale.0.out => remora.SP.0
net spindle-on <= spindle.0.on => remora.output.9


edit, honestly ive been thinking the same as tux,
im surprised remora can keep up with that many steps. I need some kind of step/freq calculator
Last edit: 05 Sep 2023 15:57 by cakeslob.

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05 Sep 2023 16:05 #280002 by slawekgonet
Hey,

I flashed my NVEM v5 with github.com/scottalford75/Remora-RT1052-c...ora-rt1052-1.1.0.bin

Which JSON config I should upload and which LinuxCNC sample config I should start with to get it to work with NVMPG?

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06 Sep 2023 00:56 - 06 Sep 2023 02:24 #280040 by GeramyL
Ahhh okay, it seems my PWM settings on my VFD are backwards or something haha, when I put spindle speed at 0% I get 100% spindle speed, when i put linuxcnc at 100% spindle speed my actually spindle speed is 0% or well not 0% because I have a required minimum so i don’t damage the drive.
Last edit: 06 Sep 2023 02:24 by GeramyL.

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07 Sep 2023 09:01 - 07 Sep 2023 09:03 #280179 by cnc-phil
Need help, please.
I successfully managed to install the firmware. At first the steppers made some cracking sound (which I thought came from being the pc not ideal with a slow clocked Pentium J5005), but I used the 0.2.1 image.
After flashing the remora-rt1052-1.1.0.bin file and uploading the config, the steppers are running smooth now.

Now I have two questions:

My Novusun NVEM v5 controller only came with a v2 manual and on my controller there are no 12V connector for the limit switches, instead there are COM connectors next to the input pins. If I connect a microswitch between COM and IN4 there are no changes in the HAL Meter visible. Should I connect the microswitch between the most right 12V and IN4 ?

And my second question, I removed the unused A, B, Z axis from the config file and some MPG config entries, uploaded the config again, but they still show up in the HALshow. Is this right? Or should I just upload the full-config? Are there any performance improvements if I delete some unused pins?

Thank you.
Last edit: 07 Sep 2023 09:03 by cnc-phil.

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07 Sep 2023 09:11 #280180 by slawekgonet
On my v5 there is 12V pull-up on, for example, INP3 pin. You can check it with multimeter, there should be +12V between COM and INP3.

With `nvem-rt1052.txt` config uploaded with:
$ python3 remora-rt1052-basic/upload_config.py nvem-rt1052.txt

I see an action in HAL on `remora.input.06` when I connect COM and INP3 together.
The following user(s) said Thank You: cnc-phil

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07 Sep 2023 09:47 - 07 Sep 2023 09:57 #280187 by cnc-phil
Thank you so much. I measured only 6V, but after changing the input voltage of the nvem board from 12,5V to 24V it works (now I only have to get the 0-10V spindle output working)!!
Last edit: 07 Sep 2023 09:57 by cnc-phil.

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07 Sep 2023 09:51 #280189 by slawekgonet
Do you, by any chance, have NVMPG? Because that's the only thing I was not able to get working so far.

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07 Sep 2023 10:04 #280191 by cnc-phil
No, I do not own one, yet.

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