M208 fails to set maximum Z movement

[gratefulfrog]

I am sorry to have to report another issue firmware 1.09,

I would like to set maximum X,Y,Z values to prevent the motors from skipping and/or the head form banging. However, for the Z axis, the M208 gcode fails to work.

When I run the gcode at the console:

M208 X131 Y140 Z73

Then I try to manually move the head:

• beyond X=131, the head stops at X=131, and will go no further,
• beyond Y=140, the bed stops at Y=140, and will go no further
• beyond Z=73, the head continues to climb, with no limit!

I hope this is not to hard to fix.

Cheers,
Bob

[dc42]

I just tested it in my fork, and M208 does limit the Z axis movement correctly, assuming of course the printer has been Z-homed and you do not use M564 to disable the limit. However, the current RepRapPro source code explicitly disables the check for the Z axis.

[gratefulfrog]

Hi dc42,

Of course, I had Z-home before testing...

So you say that your fork corrects this problem as well as the Y compensation issue that I raised earlier?

I'd like to try your fork, could you please tell me where to get it and how to install it, and if there are any issues I should be aware of?

Cheers,
Bob

[dc42]

You can find my fork at
https://github.com/dc42/RepRapFirmware/tree/dev/Release. Follow the link
to the version you want (1.09k-dc42 is the latest) then click on Raw to
download it.

If your printer is an Ormerod 2 then your existing config.g file should
work with it. Otherwise, you may need to add a M574 line in config.g to
tell it what sort of homing switches you have. Also if you want to use
simultaneous X and Y homing then you need to use my homing files. See
http://reprap.org/wiki/Configuring_RepRapFirmware_for_a_Cartesian_printer for
more.

David Crocker, Escher Technologies Ltd.
http://www.eschertech.com
Tel. +44 (0)20 8144 3265 or +44 (0)7977 211486

On 01/11/2015 22:10, gratefulfrog wrote:

Hi dc42,

Of course, I had Z-home before testing...

So you say that your fork corrects this problem as well as the Y
compensation issue that I raised earlier?

I'd like to try your fork, could you please tell me where to get it
and how to install it, and if there are any issues I should be aware of?

Cheers,
Bob

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