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Post by jimbo2030 on Sept 15, 2020 6:27:40 GMT
Hi All,
I just purchased and put together my Mega V. I installed Lightburn and in the process of setting it up I ran into an issue. I can job the machine anywhere, but the moment I let the computer control the CNC, the motor (X specifically) gives a loud BRRRR sound and barely moves. I've tried to adjust the acceleration settings, but that didn't seem to do anything. Any help is appreciated.
Thanks!
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Post by Bruce on Sept 16, 2020 3:32:52 GMT
Make sure there is a washer between the X axis motor mount plate and the X axis gantry mounting plate (Two M6 washers, one on each screw) . This offsets the pinion from the rack to facilitate movement. To much pressure on the pinion against the rack makes the stepper motor work harder and sometimes causes missed steps (Grinding BRRR noise)
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Post by jimbo2030 on Sept 16, 2020 20:36:21 GMT
Hi, Thank you for the reply. I have those washers mounted. I changed some settings within Lightburn. I attached the photo of my settings as they are now. The Max Rate and the Acceleration numbers were really high compared to what they are now. For anyone that may have this issue in the future, this is the site I took the figures from: github.com/gnea/grbl/wiki/Grbl-v1.1-ConfigurationWhat is strange is that when I jog the machine, when I home the machine, or when I actually run the laser, it is smooth as silk. When I try to use the "Set laser position" function within Lightburn, it give me trouble. I suspect that my board size settings are wrong. I have the 35" machine (890mm). If I home the machine, then try to jog it to the right 450mm, I end up having to stop it before it hits the right rail. If I solve this issue, I'll try to post my solution. If anyone knows how to do that, please let me know! Thanks! Attachments:
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Post by Bruce on Sept 17, 2020 1:26:22 GMT
I don't know anything about lightburn. Here are the default GRBL settings for the Mega V that might be of help.
$0=10 $1=255 $2=0 $3=0 $4=0 $5=0 $6=0 $10=1 $11=0.010 $12=0.002 $13=0 $20=0 $21=1 $22=0 $23=0 $24=35.000 $25=800.000 $26=200 $27=4.000 $30=12000 $31=0 (0=mm 1=inches Position Display Units) $32=0 $100=57.288 $101=57.288 $102=200.000 $110=16510.000 $111=16510.000 $112=4570.000 $120=1470.000 $121=1470.000 $122=700.000 $130=483.000 --483.0=19" --889.0=35" $131=483.000 --483.0=19" --889.0=35" $132=128.000 ok
Setting descriptions:
$0 Step pulse time [us] $1 Step idle delay [ms] $2 Step port invert [mask] $3 Direction port invert [mask] $4 Step enable invert $5 Limit pins invert $6 Probe pin invert $10 Status report [mask] $11 Junction deviation [mm] $12 Arc tolerance [mm] $13 Report inches or mm $20 Soft limits $21 Hard limits $22 Homing cycle $23 Homing direction invert [mask] $24 Homing feed [mm/min] $25 Homing seek [mm/min] $26 Homing debounce [ms] $27 Homing pull-off [mm] $30 Max spindle speed [RPM] $31 Min spindle speed [RPM] $32 Laser mode enable $100 X steps/mm $101 Y steps/mm $102 Z steps/mm $110 X max rate [mm/min] $111 Y max rate [mm/min] $112 Z max rate [mm/min] $120 X acceleration [mm/sec^2] $121 Y acceleration [mm/sec^2] $122 Z acceleration [mm/sec^2] $130 X max travel [mm] $131 Y max travel [mm] $132 Z max travel [mm] $140 X homing pull-off [mm] $141 Y homing pull-off [mm] $142 Z homing pull-off [mm]
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jv
New Member
Posts: 49
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Post by jv on Sept 17, 2020 12:27:58 GMT
I am not in front of my computer to look at my settings, so I am trying to think of stuff off of memory. If the machine is hitting the right rail, a few things come to mind. You may not have the job origin set up correctly. - Did you watch the light burn tutorials? They're decent to watch and you will learn a lot really quick. Jtech has a couple of videos that might help as well. - "Set laser position"? Did you mean to say "set origin"? you have 3 options that you will use- clear origin, set origin and set finish position. - If you're asking about the bed sizing could possibly be wrong, is it a safe assumption you didn't watch the set up videos online that light burn has? They really help and walk you through setting your machine up. - I believe your issue with the machine crashing to the right side is the job position that is chosen. I think this one might be the main culprit. - If you are telling the machine to move 450 mm and it's moving basically 1000 mm, could be a possible calibration issue. Measure out a square, burn and check if you're able to. Hopefully something above helps you get it going. I had a similar issue with the machine crashing to the right side. I think it came down to job position. Try this video from Jtech youtu.be/FPZ3MnyyQ-s
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