Absolute linear scales

I believe I do know My next question is official releasing of 2.8 far away?


Tero

Ok, I will consider this. If I decide to give it a go, I will replace harddrive and copy my config folder there after fresh install. That way reverting back to 2.7 is easy.


Tero

I decided to get another similar PC for this tryout it is even easier to swap in and out than HD. I started a new thread under installing LinuxCNC because it goes slightly off topic.


Tero

Hmmm.... I have this problem:

Commanded position G54 Y -35. And machine position at -34.976 there is a 0.024mm difference always. If commanded is Y-100. it is positioned at -99.976 What might cause this?


Tero

Modified NC program so that Y-35 position command is Y-35.024 And now actual position is -35.000 where does this +0.024mm come from?? It is same with 2.7.6 with NO_FORCE_HOMING and 2.8.0 pre1 with ABSOLUTE_ENCODER_HOMING = 2


Tero

I am quite sure position is same regardless of approach direction(I will confirm this tomorrow). Linear scale give resolution of 0.00001mm and Servos have 0.0002 resolution(encoder for servo amplifier only not connected to LinuxCNC). Also I can move to any position with steps of 0.001mm with MPG. If this was a problem with resolution would commanding Y-100.024 result in a position of -100.000 ?


Tero

Is this an error in commanded position or actual position?