Remora - ethernet NVEM / EC300 / EC500 cnc board

Hi,

I somehow have troubles with my Linuxcnc setup. I use linuxcnc together with a NVEM Board with a RT1052 on it and the Remora-RT1052-cpp. When I do normal milling I usually don't see any problems. But with complex 3D surfaces all of the axis somehow drift away. It's not much but after 15 minutes of milling it's about 0.1mm. I'm quite sure that the problem are not the motors or the drivers. I also have the correct setup (setup and hold times) for my motordrivers, I even checked them with an oscilloscope and they are fine. With the oscilloscope I could also see, that the problem is not an EMI Problem, the signals (STEP/DIR) are not noisy at all.
Is it possible, that there is a problem with the Stepgenerator? I use the (almost) latest firmware 3.13 but from what I've seen the changes after 3.13 where not related to the Stepgenerator.
If not what else could cause this problem?

Thanks Clemens

Hi Clemens,

When you say "drift away" do you mean actual measured physical position or the position reported by LinuxCNC?

The Remora firmware feeds back the steps generated to LinuxCNC, so the axis position feedback can be calculated.

Hi Scotta,

it's the actual measured position. I use e.g. G0 Z0 and measure the position with a dial gauge. The value on the dial gauge drifts away

Maybe it helps if I give you more information about my machine.
I have a 4 Axis Mill with 1X 2Y 1Z 

In the attachment I added the configuration of the machine and the configuration of the NVEM. I also added the g-code file where I can reproduce the problem

I hope this helps.
Let me know if you need something else

Thanks

Clemens

I have my Denford Triac PC running on remora and an EC500 , DM556t drivers, Probe Basic UI.Amazon cheap 23" touch screen.
I'll post my ini and hal later in the week if anyone is looking to do the same.

I'm trying to get the nvpmg to work. In halshow the inputs 1 to 9 are switching. But when the counts for the mpg are not working. Encoder.0. does not count when the mpg is moved. I have tried both input.19 -- input 25 and input 27 and 28 in the nv-mpg.hal but still nothing , should the switch be set the nv or std ? 

^^^^^
Have it sorted encoder inputs were on 20 and 21