Fehlmann Picomax 100 Retrofit

all subroutines are running and homing without index under 2.9.3 also.
so oiling, toolchange and column control is done:



So now all what's left is home with index and some cleaning in the gui

thinking about how to solve the problem to conveniently adjust the Z offset when moving the column, just using linear scales als I always wanted was the easiest solution in the end.
So i skipped the manual part. Bought some scales and printed which did fit in the ode mounts for the pointer. Just added a third boost spaced with water for stiffness.



I can set the encoder position by M_code which I only need when I move the column without linucnc active. Which will almost never happen. Cause unlocking the column without the hydraulic as a real pain. The position is made persistent by ustoring it in a parameter.

youtube.com/shorts/wv0c47Jk_JA

I also can now move the column to a fixed or relative position.
While the lowest preset position can't be traveled over. This way I can prevent collisions when using big setups.
Same for the highest.

the preset heights are now set by the scale and stored and loaded in the VCP parameters hals analog outs als Hal lcd widgets. Only downside they are not updated until used once.
but that's fine.

did my first cuts on the Fehlmann to make the crane plate to move her to my new shop.










when I was circular milling I found that I had step losses. No errors in the drives, so this couldn't be. Since the drives are closed loop.
After some digging I found my stupid mistake when transferring the max acceleration from the drives to linuxcnc. It never showed till I really used a very slow movement on the Z axis.
So I dropped the acceleration in linuxcnc.
And now I get two strange things. Sometimes the Axis are oscillating shortly like a bad tuned PID system. I can see it on the dro, so it comes from linuxcnc also the machine now sometimes misses the reference switches, I can see that they are triggered. but the machine keeps traveling till hitting the limit switch. when I stop the homing before it behaves normal homing with the reference tripped.

Any Idea where to start searching?

STEPLEN (Stepper intervall in ns) 5000
STEP_SCALE = 1250
MAX_VELOCITY = 150
MAX_ACCELERATION = 150
STEPGEN_MAXVEL = 200
STEPGEN_MAXACCEL = 200

Thanks

Patrick

Is this an open loop system or is there position feedback to LinuxCNC?

There is no feedback to linuxcnc,

Hello, can you tell me if limit switches are NO or NC 24vdc...I have a similar machine and I am trying first of all to bring it to the factory control.. it throws out errors that one of the limit switch is on , control allows me to reference    to the z axis, xy will not reach the switches. linear scale on x is also filled with dirt and have to figure out how to clean it. thank you very much

If its still of interest, the limit switches are normally closed, and go over a relay to the controls.

Now that most of work which came with moving is done its time to finish the reason why I bought this machine in the first place...
The 4th Axis. The servo is running, so it's time to finish the brake, lubrication and homing. Then using the chance to also install the tool setter.

Also using the chance to update the scematics

now I am waining for some additional pins for the Harting connectors 

Then making a small junction box, so the A-Axis can be easily removed