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General Mach Discussion / Acceleration set the same for all axes?
« on: May 03, 2012, 04:49:03 PM »
There's a post on Bob W's CNCCookbook site about him running into an issue he felt was related to uneven accelerations on the axes. He noted poor contour following with uneven accelerations and a marked improvement at the visual level by setting the accelerations the same across the three axes.
Is this a confirmed phenomena, do the axes really need to have very similar accelerations?
Seems like it would be more apparent in the X-Y axes, which the accelerations are easy to get the same. For most of us it's the Z axis that is difficult to maintain the same accelerations. Right now my servo based RF45 conversion can support acceleration of 50 on X and Y, and 20 on the Z even with gas springs to assist the head. I'm planning on running the X and Y and around 35 for acceleration and was going to leave Z at 20. It's a little harder to find the issue when looking to couple it with Z moves.
Anyway - insights are welcomed, I searched and found nothing on the subject.
Is this a confirmed phenomena, do the axes really need to have very similar accelerations?
Seems like it would be more apparent in the X-Y axes, which the accelerations are easy to get the same. For most of us it's the Z axis that is difficult to maintain the same accelerations. Right now my servo based RF45 conversion can support acceleration of 50 on X and Y, and 20 on the Z even with gas springs to assist the head. I'm planning on running the X and Y and around 35 for acceleration and was going to leave Z at 20. It's a little harder to find the issue when looking to couple it with Z moves.
Anyway - insights are welcomed, I searched and found nothing on the subject.