Moving Z to zero causes limit error, but limit is Z=0

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24 Oct 2020 03:39 #187063 by JetForMe
I have an ongoing issue where generated gcode does

G53 G0 Z0.

And LinuxCNC complains. Thing is, it's set up such that that's the upper Z limit (MAX_LIMIT = 0.0). Shouldn't it be willing to go TO the limit (obviously not past it)?

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24 Oct 2020 08:04 #187076 by tommylight
What's the complaint ?
I use that daily and have no issues with it.

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24 Oct 2020 11:10 #187093 by MaHa
If you set MAX_LIMIT = 0.0, retracting to G53 G0 Z0 it will hit the limit. MAX_LIMIT = 0.001 or greater will work

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26 Oct 2020 19:26 #187334 by JetForMe
That it exceeds the travel limits.

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26 Oct 2020 19:27 #187335 by JetForMe

MaHa wrote: If you set MAX_LIMIT = 0.0, retracting to G53 G0 Z0 it will hit the limit. MAX_LIMIT = 0.001 or greater will work


That seems imprecise, and a bug, no?

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26 Oct 2020 19:46 #187337 by PCW
Not really. LinuxCNC uses actual position when limit checking and there will always
be some position error relative to commanded position so a small amount of headroom is needed.

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26 Oct 2020 23:13 #187352 by phillc54

JetForMe wrote:

MaHa wrote: If you set MAX_LIMIT = 0.0, retracting to G53 G0 Z0 it will hit the limit. MAX_LIMIT = 0.001 or greater will work


That seems imprecise, and a bug, no?

To me that seems very precise and correct.

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27 Oct 2020 08:07 #187392 by rodw

phillc54 wrote:

JetForMe wrote:

MaHa wrote: If you set MAX_LIMIT = 0.0, retracting to G53 G0 Z0 it will hit the limit. MAX_LIMIT = 0.001 or greater will work


That seems imprecise, and a bug, no?

To me that seems very precise and correct.


X 2

The work envelope needs to be inside the limits.

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