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First, thanks for all the help.  This is my time LinuxCNC so, please bear with me.  My setup:  Rpi5 with SPI to a BigTreeTech SKR 1.4 (has the LPC processor) running Remora pulled from Github a couple weeks ago.  I got everything compiled and I think in the right place (I got a bunch of warnings on the SPI Remora compile but was told to ignore).  I figured the remora-xyz sample code looked like a good place to start.  The LinuxCNC Config Selector allows me to select remora-xyz and a window starts with axis.ngc.  *The problem is that the Emergency Stop button comes up pressed and it can't click it off*.  I have tried using the halmeter tool and found a variable called iocontrol.0.user-request-enable that I think may be relevant based on looking at the .hal file.  This PIN reads FALSE but very briefly flashes to TRUE, then back to FALSE when I click on the Estop button.  I as wondering if the remora-xyz example is actually trying to read a HW input somewhere on the SKR 1.4 board that I should be terminating correctly?   Any suggestions much appreciated.  TIA.   

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