Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Robotintheforest on February 04, 2019, 08:53:24 PM
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Hi All I am running a CNCRouterparts 5x10, it's my second cnc router. I am trying to do an engrave toolpath inside a square with a 1/2" 60 degree V-bit but when the bit comes to do the corner pass where it drags up to square the corner it is slightly over cutting the corner which gives me a little flare on the profile. I have tried slowing the feeds, zeroing on top and at the bottom of the wprkpiece, lowering the acceleration curves of the motors, playing with CV on/off and different CV angles as well as outputting g-code from Fusion360 and Vectric. The F360 files were slightly less pronounced but still happened. Does anyone know what might be causing this? I am at a loss.
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Hi,
I don't know if there is a specific answer for your situation but:
lowering the acceleration curves of the motors,
is exactly wrong. The best and most accurate tool path following is achieved with the HIGHEST POSSIBLE
acceleration, not the lowest.
Craig
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Thanks Craig, I will up the curves tomorrow and see what happens.
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Well increasing motor acceleration helped up until the table started shaking (damn you extrusion) along with lowering the feed rate. I am still getting some small ears but they are much reduced. Seems a bit strange though I have done lots of engraving on my much cheaper ballscrew machine and haven't noticed anything like this before.
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Hi,
I suspect it's the ratio of acceleration to velocity. The higher the acceleration allows the spindle to follow the tool path
at a given speed. Increasing the acceleration OR reducing the feed rate achieve the same result.
Craig