my machine, precise but not stable!
Posté : dim. mars 17, 2019 7:56 am
Hi Jérome, Hi Alain, Hi Cutters,
first i want to thank you for this wonderful piece of software and the great ideas of you and the community members!
My name is Jeremy. Having a 3d Printer and a cnc-router i used these machines to bild a cnc hotwire cutter. I had a lot of fun building and the results are great, but sometimes ( approx. one out of three times) my machine suddenly stops cutting. I tried to figure out what the reason is, but dont really know, as it seems to me that it is related to usb Communication or timer calculation or something else. So i wanted to ask if someone has similar problems or might have an idea whats the reason. Here are the specs of my machine, if you need more information, please let me know:
Software:
Jedicut - Alden 1-2-3 with a LCD
Electronics:
Arduino Ramps 1.4,
4899 Drivers, microstepping set to 1/8
12v 47A Power Unit conncted to both Voltageinputs on Ramps
NEMA 17 Motors 12v
Hardware:
Wooden construction with Slides, running very smooth. X-axis 53cm travel, Y-axis 40 cm travel
Threaded Rods 8mm diameter with 8mm Pitch
Hot wire 0,5mm / 0,4mm / 0,25mm , Length adjusteable, Wire in a seperate bow.
Configuration:
Uploaded latest Version, set correct COM Port in the .ini File, Baudrate 115200
i have 0,05mm per Step,
Slowspeed is set to 176 which gives me a Speed of 1,75mm/sek
Fastspeed is set to 64 which gives me a Speed of 4,89mm/sek
The Hz i use is the default 62500 as i read somewhere to leave this untouched.
Temperatur controll works fine.
So if i am cutting, the machine starts normal and sometimes suddenly stops / crashes. It does not reboot, The motors in that case still have power, and the wire is still heating but its not moving anymore. This actually never happens within a specific part of the Cut, but mostly exactly between two steps, for example: Moves to start hight / Pause/ moves horizontal 10mm / and then it stops, exactly when it should start to cut the upper wing side. Sometimes the same happens at the end of the upper side ore just befor it starts to cut the lower side.
So i thought the problem it is related to power as at these specific points the machine has to run all 4 motors at a time, but the power unit is big enough (47 A at 12,2V and i tried by Powering from a big 3s Lipo as well without a positiv effect) and if i drive manually (oblige) it works without any problems.
I tried a different Arduino Ramps Board, same problem. Also different USB Ports and Cables
I tried bigger Stepper drivers, motors work much louder and get hot but same problem.
I tried different reference-voltage for the steppers, no positiv effect.
I tried to reduce Microstepping to 1/4, machine runs rough and loud, but still the same problem.
I trtied to insert a pause of 100 ms between each step in cycle of cut manager, machine crashed and moved extremly slow 0,08mm/sek in wrong direction.
If it runs, th results are great, the machine is very precise, i cut Airfoils, Letters, Fuselage from .dat and from .dxf and it is totally cool and fascinating, i simply would like to have it to run more stable as i already filled 5 big waste-Bags of Styrofoam and XPS...
Any Help is welcome, and is there a way to attache Pictures without uploading to an external server first?
best regards, Jeremy
first i want to thank you for this wonderful piece of software and the great ideas of you and the community members!
My name is Jeremy. Having a 3d Printer and a cnc-router i used these machines to bild a cnc hotwire cutter. I had a lot of fun building and the results are great, but sometimes ( approx. one out of three times) my machine suddenly stops cutting. I tried to figure out what the reason is, but dont really know, as it seems to me that it is related to usb Communication or timer calculation or something else. So i wanted to ask if someone has similar problems or might have an idea whats the reason. Here are the specs of my machine, if you need more information, please let me know:
Software:
Jedicut - Alden 1-2-3 with a LCD
Electronics:
Arduino Ramps 1.4,
4899 Drivers, microstepping set to 1/8
12v 47A Power Unit conncted to both Voltageinputs on Ramps
NEMA 17 Motors 12v
Hardware:
Wooden construction with Slides, running very smooth. X-axis 53cm travel, Y-axis 40 cm travel
Threaded Rods 8mm diameter with 8mm Pitch
Hot wire 0,5mm / 0,4mm / 0,25mm , Length adjusteable, Wire in a seperate bow.
Configuration:
Uploaded latest Version, set correct COM Port in the .ini File, Baudrate 115200
i have 0,05mm per Step,
Slowspeed is set to 176 which gives me a Speed of 1,75mm/sek
Fastspeed is set to 64 which gives me a Speed of 4,89mm/sek
The Hz i use is the default 62500 as i read somewhere to leave this untouched.
Temperatur controll works fine.
So if i am cutting, the machine starts normal and sometimes suddenly stops / crashes. It does not reboot, The motors in that case still have power, and the wire is still heating but its not moving anymore. This actually never happens within a specific part of the Cut, but mostly exactly between two steps, for example: Moves to start hight / Pause/ moves horizontal 10mm / and then it stops, exactly when it should start to cut the upper wing side. Sometimes the same happens at the end of the upper side ore just befor it starts to cut the lower side.
So i thought the problem it is related to power as at these specific points the machine has to run all 4 motors at a time, but the power unit is big enough (47 A at 12,2V and i tried by Powering from a big 3s Lipo as well without a positiv effect) and if i drive manually (oblige) it works without any problems.
I tried a different Arduino Ramps Board, same problem. Also different USB Ports and Cables
I tried bigger Stepper drivers, motors work much louder and get hot but same problem.
I tried different reference-voltage for the steppers, no positiv effect.
I tried to reduce Microstepping to 1/4, machine runs rough and loud, but still the same problem.
I trtied to insert a pause of 100 ms between each step in cycle of cut manager, machine crashed and moved extremly slow 0,08mm/sek in wrong direction.
If it runs, th results are great, the machine is very precise, i cut Airfoils, Letters, Fuselage from .dat and from .dxf and it is totally cool and fascinating, i simply would like to have it to run more stable as i already filled 5 big waste-Bags of Styrofoam and XPS...
Any Help is welcome, and is there a way to attache Pictures without uploading to an external server first?
best regards, Jeremy