Coordinate system - Running from a program line problem.
- AlessandroT
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31 Jan 2021 20:03 - 31 Jan 2021 21:34 #197243
by AlessandroT
Coordinate system - Running from a program line problem. was created by AlessandroT
Sorry for the newbie question, but i get always this problem and I want to know how to avoid it.
Example:
My machine is setted up with 5 axis.
I'm running a program. For some reasons I get a stop to the machine and I want to start again the program from a line where it was interrupted.
If my A axis was at position 312500 in that line, I try to write "g92 A 312500" or a bit less than this.
When I run the program from that line, the A axis skip very fast over 312500 and continue to increase ( I don't know in which coordinates world is setted the target value If it's 312500 ) generating a following error, and I can't start the program.
Any suggestions to solve it, please?
Example:
My machine is setted up with 5 axis.
I'm running a program. For some reasons I get a stop to the machine and I want to start again the program from a line where it was interrupted.
If my A axis was at position 312500 in that line, I try to write "g92 A 312500" or a bit less than this.
When I run the program from that line, the A axis skip very fast over 312500 and continue to increase ( I don't know in which coordinates world is setted the target value If it's 312500 ) generating a following error, and I can't start the program.
Any suggestions to solve it, please?
Last edit: 31 Jan 2021 21:34 by AlessandroT.
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- andypugh
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02 Feb 2021 00:14 #197353
by andypugh
Replied by andypugh on topic Coordinate system - Running from a program line problem.
What does the line that you are starting from say in this example?
You could try touch-off in the GUI (which used G10) to set the A axis position, but I am very unclear on why that is needed.
You could try touch-off in the GUI (which used G10) to set the A axis position, but I am very unclear on why that is needed.
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- AlessandroT
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02 Feb 2021 05:25 #197375
by AlessandroT
Replied by AlessandroT on topic Coordinate system - Running from a program line problem.
In this example, I was 3d printing and the A axis is my extruder. I tried to scale the output of the extruder "online" because it was over extruding, but when I did it, I got a "following error" and the program ended. Normally I could restart the print from that line, but if I try to do it, the A axis increase in a crazy and not understandable way by me destroying the print.
As this event of interrupt and restart a print from the middle happens many times for different reasons, I want to understand how to solve this A axis problem.
Any help to understand what happen in the software will be very helpful
As this event of interrupt and restart a print from the middle happens many times for different reasons, I want to understand how to solve this A axis problem.
Any help to understand what happen in the software will be very helpful
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02 Feb 2021 08:28 #197389
by andypugh
Replied by andypugh on topic Coordinate system - Running from a program line problem.
I don't really understand the problem.
Are you restarting completely, so that the A axis is returned to zero?
Normally:
(moves)
G1 Xxxx Yyyy A1000
(stop machine, A = 1000, move X Y Z, return, A=1000 still)
(run from line)
G1 Xxxx Yyyyy A1010
Would only be a move of 10 units in A.
If the A axis is not in the same postition as the move before the run-from-line then I think that you should be able to use "touch-off" in the GUI to set A to the right number.
But I would also expect G92 to work too.
Are you restarting completely, so that the A axis is returned to zero?
Normally:
(moves)
G1 Xxxx Yyyy A1000
(stop machine, A = 1000, move X Y Z, return, A=1000 still)
(run from line)
G1 Xxxx Yyyyy A1010
Would only be a move of 10 units in A.
If the A axis is not in the same postition as the move before the run-from-line then I think that you should be able to use "touch-off" in the GUI to set A to the right number.
But I would also expect G92 to work too.
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- AlessandroT
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02 Feb 2021 08:48 #197391
by AlessandroT
Replied by AlessandroT on topic Coordinate system - Running from a program line problem.
I usually set the G92 A1000 value or the A value identical as the line of the Gcode where I will start the program, but The A axis increase in a crazy and not controlled way over that value without stopping it.
Reality:
(moves)
G1 Xxxx Yyyy A1000
(stop machine, A = 1000, move X Y Z, return, A=1000 still)
(run from line)
G1 Xxxx Yyyyy A1010
A axis, didn't stop to increase till I push the emergency button.
Today I will try the "touch off" if it will make any difference. But anyway I would like to understand why it happen like that.
Reality:
(moves)
G1 Xxxx Yyyy A1000
(stop machine, A = 1000, move X Y Z, return, A=1000 still)
(run from line)
G1 Xxxx Yyyyy A1010
A axis, didn't stop to increase till I push the emergency button.
Today I will try the "touch off" if it will make any difference. But anyway I would like to understand why it happen like that.
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- andypugh
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02 Feb 2021 08:58 #197394
by andypugh
Replied by andypugh on topic Coordinate system - Running from a program line problem.
Is A configured in the INI as a WRAPPED_ROTARY?
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02 Feb 2021 09:01 #197395
by AlessandroT
Replied by AlessandroT on topic Coordinate system - Running from a program line problem.
No is it a LINEAR TYPE.
[JOINT_3]
TYPE = LINEAR
MAX_VELOCITY = 2500
MAX_ACCELERATION = 1500.0
# Set Stepgen max 20% higher than the axis
STEPGEN_MAX_VEL = 3000.0
STEPGEN_MAX_ACC = 2000.0
[JOINT_3]
TYPE = LINEAR
MAX_VELOCITY = 2500
MAX_ACCELERATION = 1500.0
# Set Stepgen max 20% higher than the axis
STEPGEN_MAX_VEL = 3000.0
STEPGEN_MAX_ACC = 2000.0
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- tommylight
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02 Feb 2021 10:27 #197405
by tommylight
Replied by tommylight on topic Coordinate system - Running from a program line problem.
For the extruder you need to set the stepgen to velocity mode, not position mode.
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02 Feb 2021 13:18 #197420
by andypugh
That (probably) only works if the G-code is set up for it. And even then I don't know how it would work for retracts.
Replied by andypugh on topic Coordinate system - Running from a program line problem.
For the extruder you need to set the stepgen to velocity mode, not position mode.
That (probably) only works if the G-code is set up for it. And even then I don't know how it would work for retracts.
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02 Feb 2021 13:32 #197425
by tommylight
But how to use it is for now unclear to me, but i would assume something similar to a spindle... a bit fuzzy on all this.
Replied by tommylight on topic Coordinate system - Running from a program line problem.
Direction should work in velocity mode, or?
For the extruder you need to set the stepgen to velocity mode, not position mode.
That (probably) only works if the G-code is set up for it. And even then I don't know how it would work for retracts.
But how to use it is for now unclear to me, but i would assume something similar to a spindle... a bit fuzzy on all this.
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