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Thread: Chatter in one direction
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12th April 2015, 01:56 PM #1Senior Member
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Chatter in one direction
A pic says a thousand words, so here is a video to demonstrate the problem https://www.youtube.com/watch?v=H7qaG4fT9qs
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12th April 2015 01:56 PM # ADSGoogle Adsense Advertisement
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12th April 2015, 02:06 PM #2Taking a break
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Just to clarify what you've written in the video description; when you reversed the direction of the cut path the chatter happened on the other side (which would make it the same direction on the X-axis ie. towards the camera)?
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12th April 2015, 02:46 PM #3Senior Member
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Yep that's right the chatter was still towards the camera coming the other way, which suggests that my initial thought of it being related to position furthest away from the X axis ball screw was not correct.
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12th April 2015, 02:52 PM #4Taking a break
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I don't know much about the hardware side, but it sounds like the servo driving the ball screw doesn't like travelling in that direction for some reason
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12th April 2015, 03:00 PM #5Senior Member
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Same motor and controller on the Y axis and it doesn't do it in either direction, so thinking it isn't hardware related, it could still be related to the unsupported X axis, but don't know why it only does it in one direction. Still brain storming ideas...
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12th April 2015, 03:02 PM #6Senior Member
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Might be worth swapping the motor out, just to eliminate it as a potential issue.
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12th April 2015, 03:07 PM #7Taking a break
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12th April 2015, 03:51 PM #8SENIOR MEMBER
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Hi, is the spindle rotation with or against the direction of cut?
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12th April 2015, 03:54 PM #9Taking a break
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12th April 2015, 04:07 PM #10SENIOR MEMBER
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12th April 2015, 04:19 PM #11Senior Member
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The ball screw although high up isn't very far from the linear rail. Basically the linear rails are sitting on the top bars, then then two bearings, then the plate like the one in the video, and then the ball screw mounting bracket is attached from the top side, so in terms of rigidity it would be hard to get it any closer.
Yes it is home made by me
If I was an alignment issue I would expect chatter in both directions. I should mention that top linear rail isn't overly secure at the moment where the Y axis is.
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12th April 2015, 08:46 PM #12Senior Member
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Are you missing a ballscrew on one side ? Looks like you are going to use two on that axis but haven't put the second one in yet. With only one on one side I am surprised it is working as well as it is. The racking effect will be greatly amplified having one side driven and the other floating in the breeze, especially near the undriven side.
Also I have found that a little coolant goes a long way when cutting aluminium, I use WD40 applied liberally and get much better finishes on my home-made machine.
Cheers.
Russell.
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12th April 2015, 08:49 PM #13Senior Member
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Also have you measured the pockets, I would expect the dimensions to be a little off as the "loose" end will tend to be out of position to the driven end, the cutter would tend to "push" away from the material instead of "being pushed" by the machine, if that makes any sense.
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12th April 2015, 09:06 PM #14Senior Member
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Yes it is missing a ball screw on the left side. I have been stalling fitting it since the whole Y gantry has to come apart. The ball nuts fit in between the Y axis extrusions and the ball screw goes through it. Since I have been working my way up to he aluminium piece I have been putting it off until the alloy pieces are done.
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