Z axis homing problem

[dezsoe]

The profile seems to be good. Now I have no idea... I'll mix some wires to try the profile without any change in it, but I need some time.

[dezsoe]

I've just made a test run with the given profile and UCCNC 1.2047 with UC400ETH. Homed about 50 times without any problem, so now I really don't know what to do. Could you make a video to show the full issue?

[Battwell]

it was working fine for about a year- then stopped working!
firmware upgraded on newer install
same pin for all 3 axis- which is the weird thing.

ive told him to change the sensor with one of the others- its a prox sensor

[dezsoe]

There's no problem with connecting all limits and homes together. It works fine if the correct type of sensors are used. One more question. The DRO keeps counting to the same direction when the axis stops or does it reverse?

[Battwell]

https://www.youtube.com/watch?v=s9Sryc9 ... e=youtu.be

you can see the z dro continue

[Battwell]

https://youtu.be/02ZgJ-o3cPI

[dezsoe]

Thank you for the video. In the first one, between 0:04 and 0:05 there's the answer.

- Z counts up, O9 is low
- Home lights up
- O9 goes high
- Z counts down

So, as I see the homing starts, Z goes up, home triggers, Z stops and starts to go down, but the home switchs does not release. UCCNC does what it has to do.

IMHO, it is some hardware problem. As I understand what you wrote, Z goes to home switch, stops, but doesn't start to move down, only the DRO counts. There must be something with the Z drive around the dir.

[Battwell]

the machine is still fully working except the z homing.
he has had this problem for a while but couldnt start to debug the problem until now as the machine had work to do
annoying that im 400 miles away or id go sort it straight away.
i try to help by messenger but he is scottish and talks funny!

[ger21]

IMHO, it is some hardware problem. As I understand what you wrote, Z goes to home switch, stops, but doesn't start to move down, only the DRO counts. There must be something with the Z drive around the dir.

If the motors not spinning, then I guess you'd need to check for pulses with a scope.
Based on the diagnostic page, the motor should still be moving down, as the home switch hasn't opened back up.