@droftarts I am more than happy to write up my findings and help with the documentation. I think last night I discoevered that the M350 command doesnt have an effect, and instead off scaling values for microstepping etc need to be incorporated into M92. I am now looking into why the joints aren't moving the correct amount, It may be because of my closed loop stepper drivers so once i've done some learning I will feed back the information
Best posts made by NortonAntivirus
-
RE: CNC Parallel SCARA Plasma Cutter - GCODE Issues
Latest posts made by NortonAntivirus
-
RE: CNC Parallel SCARA Plasma Cutter - GCODE Issues
@o_lampe Just a temporary setup, ultimately I will make a proper table and area for it but only once I've got it working somewhat nicely
-
RE: CNC Parallel SCARA Plasma Cutter - GCODE Issues
So a little update, I have spent a long time trying to calibrate things. I am currently using servo42c drivers, because my testing shows they increase torque from the little nema motors massively. I think my right gearbox and servo42c arrangement may be damaged, as it doesn't seem as repeatable as the left motor assembly. I think I may laser cut a grid to use as a positioning template so I can see difference between intended end effector position and achieved position. I have been using a whiteboard and a pen for this so far but it's not ideal. Both my motors are able to be manually driven from 90 degrees to horizontal and align nicely. I think maybe my arm lengths are wrong, as the aluminium piecesal are glued into the carbon tubes their lengths aren't very precise. I've tried to account for this but I don't think it's very good yet.
-
RE: CNC Parallel SCARA Plasma Cutter - GCODE Issues
@droftarts I am more than happy to write up my findings and help with the documentation. I think last night I discoevered that the M350 command doesnt have an effect, and instead off scaling values for microstepping etc need to be incorporated into M92. I am now looking into why the joints aren't moving the correct amount, It may be because of my closed loop stepper drivers so once i've done some learning I will feed back the information
-
RE: CNC Parallel SCARA Plasma Cutter - GCODE Issues
@o_lampe Thanks for your help! I have managed to get the machine working with Fusion 360. Does anyone happen to have a calibraiton procedure? I have tried measuing arm lengths, homing positions and end effector positions to calculate homing offsets etc, however I am struggling to get the machine to draw circular circles and to make shapes that are the correct size. If anyone has a good methodology for calibration please let me know ! Thanks
-
RE: CNC Parallel SCARA Plasma Cutter - GCODE Issues
@dc42 Okay, will this still work with a desired feedrate in cartesian space? Presumably for plasma cutting I dont want the end effector to be adjusting velocities. Additionally, are you aware of any post processors or methods for GCODE generation that would work well with my machine? I am wondering about changing it from CNC mode to FFF mode, it seems more parallel scara printers exist so wondering fi thats a more proven path.
-
RE: CNC Parallel SCARA Plasma Cutter - GCODE Issues
@dc42 @o_lampe I am currently using a BTT SKR V1.4 board, the latest firmware I can run on this board is 3.3.0. This means I think im unable to set G94 or G93 commands. Any ideas? If its the case I need to buy a new board do you happene to have any recommendations?
-
CNC Parallel SCARA Plasma Cutter - GCODE Issues
Hello! I am really struggling to get my SCARA Plasma cutter working,
Currently it can run the homing sequence and be driven manually using G0 commands fine, however I cant seem to get any GCODE from fusion working with it. Attached in the images is an example of what i have been trying to use. Unfortunately, i cant use G94 due to not having a V3.5 capable board. What would be the easiest way to get my plasma cutter working? I have currentl configured it CNC mode but am not entirely sure if this is the best method, attached is the config as well. Any help would be greatly appreciated, thanks!
-
RE: 5 Bar Parallel Scara Workmodes - CNC plasma cutter
@JoergS5 Once again thank you very much for your help I have made it so my plasma torch is in the hinge of the two distal arms. I had found in the prototype I needed to configure a dummy Z as well
Many thanks -
RE: 5 Bar Parallel Scara Workmodes - CNC plasma cutter
@JoergS5 Just as another question. My plasma cutter will only work in two axis, X and Y. Is it possible to offset the hotend position in both x and y or does it need to be colinear with one of the distal arms? Im just trying to figure out it my plasma torch can be mounted to the side of the Left Distal arm or if it needs to be mounted where both distal arms intersect. The first image below shows it at the intersect of both distal arms, the second image shows where I would ideally mount it, with an X and Y offset. Is it possible to apply this X and Y offset to the 5 bar parallel scara?
-
RE: 5 Bar Parallel Scara Workmodes - CNC plasma cutter
@JoergS5 Thank you for the response, in this case I shall try to design the tool location to be in the hotend positions listed in the documentation, then maybe in future I can try to implement the Robot CNC 5 Axis methods
Kind Regards
Olly