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From inductive sensors, measuring from ballscrew pulley. Should be slow enough I think.

Here's the files.   I'll work on verifying the encoders shortly.  

The config is for metric units but velocities and accelerations seem to be set for imperial units as they are way to low for metric, max speed is 60mm/m as is.
Also, old config, so what version of LinuxCNC is being used, see the top border when LinuxCNC is running.

You can use backlash compensation for each axis/joint, see if that improves something.
Add to each joint in ini file:
backlash = 0.05
Or whatever that joint needs, and also add
Backlsh_velocity = 10
That value is units per second, so 10 is 600mm/m for metric or 600 inches/m for imperial ... that would be to much

See here:
linuxcnc.org/docs/html/gcode/m-code.html#mcode:m62-m65

You have clearly wrong limits set for your axes, see the [AXIS_l] sections of your ini file:

this here tells the controller that this axis can move one micron in the negative and 8 mm in the positive direction from the home position:
Also you seem to be missing the homing setup, but you use a rather old version of linuxcnc so I'm not sure how that was done in your particular version.

I would be grateful if you could give me a little more detail. I saw that synchronized movements can be made with M63 in the manual, but I could not find details.

IRQ to be set to last cpu. That had worked for me.

Its possible, but would need slow index inputs (at least 300 usec or so in duration)
what does you index signal come from?

Do you have 5V and field power on the 7I77

(four yellow LEDs and one red LED illuminated on the 7I77)

Also posting your hal/ini files may help

Good news.
I got it working in changing the control pins for Y-axis (from 3/16 original Y-axis, to 5/6 original A-axis) on the parallel port.
But it is really weird why 2.9.3 is not working in the original Y-axis config but the old config still works with this config.

Attached the original config. As said I just swapped 2 pins around...
btw. the old version I was running was 2.7.0 Pre, I did build them myself from sources.

Thanks a lot,
DeJe

I have flashed the 2x7i77 file to my 7c81 and made a config based vaguely on this tecnique:
i made the config using 5i25 and the single 7i77 template.
when i try to start linuxcnc fails and says that it cant find the first pin (like there was no field power).
Could there be a problem with my config?
7i77 is connected to p1, pncconf shows the the 7i77 tabs at SS#0 and SS#1 and p2 p3 are free to configure. do i have to edit the hal manually (except the rpspi and the name of the card of course, I have already done that)?

Hi

I also could use some index inputs for my Emco lathe. Is it possible to make a firmware for 7i96S with 2 index inputs in isolated I/O?

Hello,
I do apologise for delay. I managed to get out the relevant files. I sure hope they will reveal what am i doing wrong.
Thank you for replying, I greatly appreciate it!

I have a problem with my milling machine because it is not accurate

Below is the part I'm making to test my machine.

 


I have a difference of -0.6 mm / 0.023622 in on the X axis
                                   -0.3 mm / 0.011811 in on the Y axis
                                   -0.1 mm / 0.00393701 in on the Z axis

no excess thickness on my program

I tested with a probe the 3 axes, and about the same location as the machining of my part when I jog 1 mm I have 1mm and I jog 5 mm I have 5mm. the problem is that I have a backlash of 0.05mm (wear of the screw).

for me my PID is good.

This is the 3rd piece I have tested and I have the same dimensions.