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  • Onkelmat
  • Onkelmat's Avatar
12 May 2025 06:38 - 12 May 2025 06:38

analog Servo spins on its own when connected to 7i77

Category: General LinuxCNC Questions

UPDATE:
After i stopped the servo from spinning on it´s own I went on to setup the limits and the X-Axis ran away like carzy, you´d give 0,05V on to the servo drive and it would react with max speed. I was confused since everything worked fine with 0,02V.
From the other axis i knew it should behave diffrent and should have a slow smooth motion with 0,5V

I´ve swapped the drives with each other, same
I´ve swapped the driver with a new one, same
I´ve checked the wiring, everything on the correct terminal.
I´ve checked the Tacho signal: 0V - THATS IT. The servodrive trys to keep up with the command, but since the Servo isn´t moving it gives even more power until it goes into fault or the axis crashes.

So i was sure the servo is cooked. I was already checking the sister machine for a spare Servo, already loosening the screws and was kinda like:
"oh let´s first remove the broken one".

As i pulled the cables i noticed the cable to the Tacho was ripped out INSIDE the screw thingy where the cable enters the housing. I repaired the wiring and voilá, servo works as expected.

So long story short, the previous owner already had the ripped wire and tried to fix it with tuning the drive, just like i did. The real problem was the severed cable to the tacho.
  • spincycle
  • spincycle
12 May 2025 06:15
Replied by spincycle on topic Bridgeport VMC760 retrofit

Bridgeport VMC760 retrofit

Category: Milling Machines

I've just heard back from the team at Leadshine.

It looks like the EL7 drives have a 0.0625ms delay on the encoder outputs.

Know people have had an issue with the 5ms delay on the DMM drives. Anyone think this might be an issue?

I've just enquired regarding any delay from analog velocity signal to drive reaction, which I assume would effect tuning as well.

Thanks,

J
  • Z3rni3
  • Z3rni3
12 May 2025 06:01 - 13 May 2025 10:45
hal functions was created by Z3rni3

hal functions

Category: General LinuxCNC Questions

Hey,
I'm currently working on configuring different setups using various Mesa boards (7i96S and 7i95T).
For creating the configurations, I’ve been using either the pncconf Wizard or Mesact. Unfortunately, neither tool seems to produce fully working configurations for my particular setup.That’s why I’m now trying to better understand which HAL functions are actually necessary.
Specifically, I’d like to learn what the different pins mean and how they should be connected in a way that makes sense.Could you point me toward some resources or documentation that would help me learn these basics?

Thanks a lot for your time!
  • hermann1976
  • hermann1976's Avatar
12 May 2025 05:49
Replied by hermann1976 on topic Change Tool Offsets after editing the Tool Table

Change Tool Offsets after editing the Tool Table

Category: Gmoccapy

Thank you very much - zz912.
Your last change is now working.
Regards, Hermann
  • newbynobi
  • newbynobi's Avatar
12 May 2025 04:44
Replied by newbynobi on topic Leaving from TOOL page

Leaving from TOOL page

Category: Gmoccapy

Yes, that is a wanted behavior!
All the mentioned buttons leads to a tool change, so after that for sure you want to go on with your work, so why do you want to stay in tool table page?

Norbert
  • akim14
  • akim14
12 May 2025 03:38

LinuxCNC Dual-Head Gantry Setup Assistance Request

Category: General LinuxCNC Questions

Thank you. The system I am working on is a water jet with dual cutting heads< two x and two z-axis, I use x and u as x2, and for the z, I used the problem I face is understanding how to implement the slave master on the x-axis and keep the z-axis independent,
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