Scara Problem
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@JoergS5
at the beginning of the video there are 10mm shifts
while at 5:10 minutes it is a single G1 X300 command from X0Y0, yes I was trying to draw the same line
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@Mauxx did you make the 5:10 command with this tool also?
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yes G1 X300
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@Mauxx to really understand: if you press many times X +10 in jog control, it draws the line correctly, but if you put G1 X300, it draws a curve?? In the same tool and without any special actions like leaving the tool, resetting or other things?
The Simplify3D has the Communication register, could you check it for unusual commands like resets?
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Exactly, you understand!!! (for communication register i'll check on monday)
Look also central cube, 2 sides are arc, i don't know why!!! -
@Mauxx can you show me what Simplify3D has in his communication window after you made the moves?
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@Mauxx Ok. Let's proceed on monday. I'm curious about the reason. I am sure, we will find the reason.
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@JoergS5 i'll show you on monday, when i go in my "lab"
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@JoergS5 I hope!!!
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@JoergS5 everything works except this thing
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@Mauxx I have an additional idea: (removed, this was not the reason)
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I try to work with 800x800 area with 0,0 at centre of tower (X-400,X400; Y-400,Y400) and this problem is in all 4 central axis
Probably you're right, so how i can set my config? -
@Mauxx is the angle limit a physical limit or can you change the limit in the configuration?
If it's a physical limit, you could place the printer nearer to an edge and/or further away from the print bed. This should give you a bigger print area.For optimal placement I cannot give a recommendation, but it's worth to search, e.g. this document: https://www.researchgate.net/publication/298430720_Optimal_Placement_of_a_SCARA_Robot_-_Lab_Report
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@JoergS5 Yes, max angle is physical limit
Sorry for my bad english... -
@dc42 have you ever encountered this issue?
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We've all focused on the stuff happening along X while Y=0.
None of that explains what happens at 3:10 or so in the video, the move from X90Y220 to X60Y220 also draws an arc. An arc that falls outside the printable area as specified by M208. None of the joints are anywhere near a limit.
Delta / Kossel printer fanatic
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it's really very strange
thank you all for your help!!! -
@Danal said in Scara Problem:
We've all focused on the stuff happening along X while Y=0.
None of that explains what happens at 3:10 or so in the video, the move from X90Y220 to X60Y220 also draws an arc. An arc that falls outside the printable area as specified by M208. None of the joints are anywhere near a limit.
That's a valid point. Maybe multiple reasons.
My ideas for things to analyze:
- the communication log of Simplify3D
- belt connection between steppers and Axes: maybe slipping or other problem. Slipping belt could explain curves at strange positions. => one more idea: maybe acceleration and speed too high, so belt starts slipping. You can test setting speed and acceleration lower
Is it a toothed belt or a non-toothed one? If it doesn't have teeth, you can check whether the belt slips at the stepper pulley when the printer makes a curve. The pulley itself could slip also (pulley on the stepper axis). You use a method which I know as ServoBelt, this produces high tension, needs high torque and may lead to slipping pulley.
@Mauxx which Duet hardware, firmware versions are you using?
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Scara give same issue also with Arduino IDE and with RepetierHost draw a Triangle...
I'm sure the belt doesn't slip, i have GT2 toothed Belt
I'm using RRF Lpc on Skr V.1.3 board
When printer draw arc Y motor doesn't move at all
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@Mauxx Maybe the scara code is another one than I checked, because I looked into David's code. Where did you download your firmware RRF LPC code? I will check it then.
