Z axis don't go down

I finally received my stepsticks, and I have a problem: all axis work fine, except Z, which can't go down (up ok).

When I hit the down button (whatever distance I want), no pulses are sent on the step pin (I checked with a led).

Any idea what can cause this? I don't have any enstop connected, and they all use the same config values in the firmware.

Thanks,

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Frédéric

Swap your stepsticks and see if the problem follows it, or remains on the z-axis

The missing endstop is the problem. I don't know why your other axes work though.

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[www.hydraraptor.blogspot.com]

@jcabre, I already tried to switch the stepstick, with no success. And as I sid, I don't see the pulses...

@nophead, I tried to wired the Z- endstop to GND, and it works! But...

The endstops checking is disabled in the firmware (as I also suspected such problem), and this setting works, because no other endstop stops axis whatever level they are (I tried to wired to GND or VCC, and the axis still working).

This problem only happens on Z-... Does this axis have a special behaviour, regarding endstops? Are there any other settings in the firmware that could cause this?

Thanks,

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Frédéric

The option to disable endstop checks during normal moves only works for x and y axis. For safety reasons the z endstop is always checked. Set the pin number to -1 to disable z axis checks - on your own risk.

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Things are clear, now! This is just an undocumented feature

Thanks for help, guys!

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Frédéric

'Set the pin number to -1 to disable z axis checks - on your own risk.'

Where do I set the pin number to -1?

Thanks.

In configuration.h after including pins.h you can do a

#define Z_MIN_PIN -1

which does exactly that. But better you set

#define MIN_HARDWARE_ENDSTOP_Z true

to false. That is all you really need.

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Thanks again.

Hi,

I've got the same problem but in my case : all axis work fine, except Z, which can't go UP (down ok).

For exemple :
* when I enter the folowing G-code : G1 Z-10 F100, extruder move down correctly
* then if I enter G1 Z10 F100, nothing happen...


I tried to set #define MIN_HARDWARE_ENDSTOP_Z to false but It did not fixed the problem.

Do you have any idea what could cause this behavior?

Sounds like the software endstop for z max got triggered. Have you set your printer height right? You could also try disabling software endstop. Or do you have even enabled z max endstops? Check if you see a value for z max endstop with M119

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Thank you for your reactivity!

Quote
Have you set your printer height right?
I think printer settings are corrects (Note : I use a REPRAP Prusa mendel v2 with ramps1.4):
* X Min = 0
* X Max = 200
* Home X : Min
* X park position: 130
* Y Min = 0
* Y Max = 200
* Home Y : Min
* Y Park position : 0
* Home Z : Min
* Z park position (Z-min) : 0
* Bed Left : 0
* BedFront : 0
* Print area width : 200
* Print area depth : 200
* Print area Height : 100

Quote
Check if you see a value for z max endstop with M119
Here is what M119 returns:
22:35:56.754 : N4054 M115 *51
22:35:56.772 : FIRMWARE_NAME:Repetier_0.82.2 FIRMWARE_URL:[github.com] PROTOCOL_VERSION:1.0 MACHINE_TYPE:Mendel EXTRUDER_COUNT:1 REPETIER_PROTOCOL:2
22:35:56.773 : N4055 M220 S100 *117
22:35:56.774 : N4056 M221 S100 *119
22:35:56.775 : N4057 M111 S15 *67
22:35:56.777 : Printed filament:0.00 m
22:35:56.777 : Printing time:0 days 0 hours 0 min
22:35:56.780 : Echo:M115
22:35:56.784 : Echo:M220 S100
22:35:56.785 : Echo:M221 S100
22:35:56.788 : Echo:M111 S15

Quote
You could also try disabling software endstop. Or do you have even enabled z max endstops?
I tried to set #define MIN_HARDWARE_ENDSTOP_Z to false but It did not fixed the problem.

Important :
* Everything was working fine during my first tests (Z axis was able to move up and down). I think the problem might be related to changes made ​​via skeinforge or Slic3r, is this possible?
* When I use Pronterface, I get the same behavior, Z goes down but not up
* I made ​​no changes to the file configuration.h.
* I tried rebooting my arduino mega with Repetier.pde. Nothing changed...

I'm completely stuck there, and I have no idea ... Thank you for your help!

UPDATE :
It seems the problem was hardware.
The solution I found was to remove the chipsets and then replace them.
Thanks