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Post by shaunstang on Jan 22, 2018 19:43:23 GMT -5
I am doing a basic pocket path to cut some letters in a sign. I keep getting a inertia error and the machine will lock up. I have tried resetting and zeroing out my axis. nothing seems to work and I have no clue what is causing it. The only way to stop the machine from spinning is to kill the power to it....anyone know why this is happening?
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Post by stevem on Jan 22, 2018 21:00:30 GMT -5
Is it possible you are trying to cut too fast?
More details on exactly what you are doing would be helpful.
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Post by shaunstang on Jan 22, 2018 22:26:14 GMT -5
I am cutting pvc still plastic board and it cuts fine except on letter "O" in the phrase "RISER ROOM IN UNIT 201"... I then ungrouped the text vector and tried to do each letter individually and it did it again on the 0 in the number 201. I am running it at F400 (guess that's top speed)...I have a A8 fyi.
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Post by chuck26287 on Jan 22, 2018 23:55:37 GMT -5
I am cutting pvc still plastic board and it cuts fine except on letter "O" in the phrase "RISER ROOM IN UNIT 201"... I then ungrouped the text vector and tried to do each letter individually and it did it again on the 0 in the number 201. I am running it at F400 (guess that's top speed)...I have a A8 fyi. Do some searching. I remember reading a post here where someone was having a weird issue. They were running the machine at 200IPM I believe, and it wasn't until they moved down from the maximum feed rate that the problem cleared. Quick check would just be to drop down to a lower feed rate and try it. Sorry I don't remember any more details. Funny that it has only happened on the circular letters. Maybe generating some centrifugal forces with the circular cutting at the high feed rate? Just thinking out loud. |
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Post by stevem on Jan 23, 2018 0:39:24 GMT -5
You can't cut letters at full speed! I would slow down your feed rate to 50-70 ipm max.
Additionally, why are you trying to cut letters with a pocket cut?
Does the file cut correctly in the preview, or does it look weird as well?
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Deleted
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Post by Deleted on Jan 23, 2018 12:19:47 GMT -5
Circles, or in your case, the letter O, are the toughest thing for a machine to do because of the constantly changing direction and inertial load. That is one reason they are used as a test shape, it also makes it easy to determine the amount of backlash in the machine. Slowing down is your solution, as your error goes up as speed increases not just because of the inertia but also because this and most CNC routers out there use open loop stepper motors for the motion system and you don't want to lose steps. Stepper motors have lots of torque at zero speed but as they increase the step rate and thus speed, their output torque drops off. The net result is you've created the perfect storm of high inertial load and low torque output.
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