5bar scara Problem configuring z probe using fsr switch
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@gnmrc_ said in 5bar scara Problem configuring z probe using fsr switch:
@fcwilt so this is what I get from m208:
g28
Axis limits (mm)s X-162.7:250.0, Y-108.5:250.0, Z0.0:200.0
Axis limits (mm)s X-162.7:250.0, Y-108.5:250.0, Z0.0:200.0
Error: Failed to home axes ZThanks for the help,
GianmarcoThanks. That all looks normal.
It seems that your kind of printer has some unique requirements - like changing the name of of HomeALL.g to something else.
So who knows what else is going on. In a "normal" printer you would have some code to home the Z axis in your HomeALL.g file. But after the X and Y are homed they can move to wherever is needed to home Z.
But in your case to move to X=0 Y=0 you have to force Z to be homed with a G92 - which makes no sense to me at all.
I gather from your config.g file you have a Z Probe which, in theory, would be used to home Z.
Since the G92 allows you to move to X=0 Y=0 have you tried adding the code to home Z with the probe?
Can you specify in G92 close to the actual position of Z? If so you can still move forward and home Z with the probe and the actual Z position would finally be established.
Or maybe you have to home Z first somehow?
Just out of curiosity what took you down the path to a SCARA printer in the first place?
Frederick
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if you send G30 on it's own does it attempt to use the probe?
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@Phaedrux Yes, the heated bed is moved up, but due to the zprobe not being inside the bed area the heated bed crash. But if I manually activate the probe the homing is completed.
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@gnmrc_ said in 5bar scara Problem configuring z probe using fsr switch:
@Phaedrux Yes, the heated bed is moved up, but due to the zprobe not being inside the bed area the heated bed crash. But if I manually activate the probe the homing is completed.
One "disadvantage" of homing Z with the probe is X and Y need to home first so the probe can be moved into position.
I don't like that so all of my printers have a physical Z endstop switch or sensor so I can home Z first thing and be sure it is safely out of the way when homing X and Y.
Then I use the Z probe for setting the Z=0 Datum, leveling the bed, creating the height map, etc.
Have you consider going that way - adding a endstop switch to the Z axis - it sounds like it might solve all of your problems.
Frederick
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@fcwilt yes in the homing file I tried to use a dummy G92 comand to trick the machine in to moving, but with no success. There is something that I’m missing but I can’t figure it out.
So I wanted to build a SCARA printer because I think that there is a lot of unexpressed potential in this kinematic but due to it’s complexity there aren’t a lot of people that wants to build one of this printers and improve them. This type of printers are left in an embrional state, particularly the 5bar one, the only 2 guys that I have seen make them work are Joerg and Pontus Borg but 3/4years have passed since the last videos and post about those printers.
Thanks for the help,
Gianmarco -
@fcwilt for semplicity of wiring I would prefere to have only the probe, but due to all this problems I’m really considering this solution.
Gianmarco
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@gnmrc_ said in 5bar scara Problem configuring z probe using fsr switch:
yes in the homing file I tried to use a dummy G92 comand to trick the machine in to moving, but with no success. There is something that I’m missing but I can’t figure it out.
I clearly misunderstood. I thought the G92 did allow homing to complete.
Just out of curiosity how about a test where the G92 for the Z axis is before the two G1 H1 moves. Then you could see if the G1 X0 Y0 move needed H2/S2.
If that worked once you could get to X=0 Y=0 then you could use the Z probe to accurately set the Z axis.
Thanks.
Frederick
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@fcwilt Nice idea, I’m gonna try and see if this trick works.
Thanks for the help,
Gianmarco -
@gnmrc_ said in 5bar scara Problem configuring z probe using fsr switch:
@fcwilt Nice idea, I’m gonna try and see if this trick works.
Thanks for the help,
GianmarcoI haven't been much help so far.
To date what I have mostly done is help you to find new and interesting things that don't work.
Frederick
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@fcwilt It’s not true, we are trying to solve a problem that seems easier than what it really is on a complex and not so well documented machine. You gave a really big help trying to figure out what the problem is, and giving option on how to solve it.
By the way if you want to build one I can give you the cad files so you have the machine too and we can complete the build of a well documented and easy to work scara arm.
Gianmarco
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Actually I would like the CAD files - I'm always up for a challenge and I like new and interesting things to work on.
Frederick
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@fcwilt ok I’m gonna send it to you, but I have no idea in how to do it. Can I link them here in some way?
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@gnmrc_ said in 5bar scara Problem configuring z probe using fsr switch:
@fcwilt ok I’m gonna send it to you, but I have no idea in how to do it. Can I link them here in some way?
Are they large?
You can attach files to messages here but I don't know if there is a size limit.
Perhaps you can email them?
Or I have a DropBox account. Maybe there is a way you can leave them there. I would have to research how to do that.
Frederick
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@fcwilt Yes they are too big to link them here, the dropbox could be the best way.
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@gnmrc_ said in 5bar scara Problem configuring z probe using fsr switch:
@fcwilt Yes they are too big to link them here, the dropbox could be the best way.
Do you have a Dropbox account? I know how to share files (yours to me) but I don't know how to allow you to put files into my Dropbox.
Frederick
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@fcwilt no but we can use a google drive in the same way right?
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@gnmrc_ said in 5bar scara Problem configuring z probe using fsr switch:
@fcwilt no but we can use a google drive in the same way right?
I don't know. I have it but to do certain things you have to sign up for a paid account. It's not much it's still another $72 annually - minimum.
Do you have Google Drive?
Frederick
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@fcwilt yes, it would be simpler to link them there
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@Phaedrux said in 5bar scara Problem configuring z probe using fsr switch:
This thread is a bit long now. Can you create a summary post of the issue as it is currently and I can pass it along to DC42 to see if he has any suggestions.
@Phaedrux do you have any news from DC42?