Motion system evaluation process for new printers April 01, 2018 05:34PM |
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Re: Motion system evaluation process for new printers April 02, 2018 02:26AM |
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Re: Motion system evaluation process for new printers April 02, 2018 12:25PM |
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Re: Motion system evaluation process for new printers April 02, 2018 12:46PM |
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Re: Motion system evaluation process for new printers April 02, 2018 04:38PM |
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Re: Motion system evaluation process for new printers April 02, 2018 04:48PM |
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Re: Motion system evaluation process for new printers April 02, 2018 07:09PM |
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Re: Motion system evaluation process for new printers April 02, 2018 07:31PM |
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Re: Motion system evaluation process for new printers April 02, 2018 07:58PM |
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Quote
dc42
@digital_dentist, did you find out what is resonating? Could it be transverse vibrations of the leadscrew itself, when the distance between the motor and the leadscrew nut is large? Such vibrations would be readily excited if the leadscrew is very slightly out of alignment with the motor shaft, due to a poorly made coupling.
Re: Motion system evaluation process for new printers April 02, 2018 08:23PM |
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Re: Motion system evaluation process for new printers April 02, 2018 08:29PM |
Registered: 10 years ago Posts: 239 |
Thank you Sir, The simplified profile and explanation will certainly help me figure things out more easily. Perhaps all the S curve stuff is just marketing fluff anyway?Quote
dc42
The motion profile is:
- In general, each G0 or G1 move has a constant acceleration segment, then a constant steady speed segment, then a constant deceleration segment (no S-curve acceleration yet).
- Between adjacent printing moves, nonzero instantaneous change in speed is allowed up to the limits set by M566. This is necessary when printing GCode which uses line segments to approximate curves, which is the way slicers generate GCode from STL models. A printing move is one that has both XY movement and forward extrusion.
- Between adjacent travel moves, or adjacent printing moves, or travel moves and printing moves, instantaneous speed changes are not allowed. This means that unless the two moves are collinear, the head must come to a stop at the boundary between the moves,.
Re: Motion system evaluation process for new printers April 02, 2018 09:00PM |
Registered: 6 years ago Posts: 207 |
Re: Motion system evaluation process for new printers April 03, 2018 07:41PM |
Registered: 10 years ago Posts: 239 |
Screws and belts have their pros and cons for sure. Screws (ball especially) carry a higher price, require more maintenance and require a more precise build but from my own observations are the only way to go if your trying to get that last bit of accuracy and print quality. I have a well tuned belt printer. Looking forward to comparing the twoQuote
klcjr89
From my experience, an i3 style leadscrew printer I used provided very good results. The machine utilized 8mm diameter four start (8mm lead) leadscrews accompanied with the OpenBuilds anti-backlash (adjustable) Delrin nuts.
The leadscrews were on all of the axes.
The print quality was very good, no ghosting since there were no belts. A Smoothieboard provided the high step rates necessary for all of the axes. The top safe travel speeds were 183mm/s.
Needless to say, I'm a big fan of leadscrew driven printers.
OpenBuilds nut:
Re: Motion system evaluation process for new printers April 03, 2018 10:15PM |
Registered: 6 years ago Posts: 207 |
Quote
Bill Clark
Screws and belts have their pros and cons for sure. Screws (ball especially) carry a higher price, require more maintenance and require a more precise build but from my own observations are the only way to go if your trying to get that last bit of accuracy and print quality. I have a well tuned belt printer. Looking forward to comparing the twoQuote
klcjr89
From my experience, an i3 style leadscrew printer I used provided very good results. The machine utilized 8mm diameter four start (8mm lead) leadscrews accompanied with the OpenBuilds anti-backlash (adjustable) Delrin nuts.
The leadscrews were on all of the axes.
The print quality was very good, no ghosting since there were no belts. A Smoothieboard provided the high step rates necessary for all of the axes. The top safe travel speeds were 183mm/s.
Needless to say, I'm a big fan of leadscrew driven printers.
OpenBuilds nut:
Re: Motion system evaluation process for new printers April 04, 2018 05:44AM |
Registered: 10 years ago Posts: 239 |
Quote
dc42
The motion profile is:
- In general, each G0 or G1 move has a constant acceleration segment, then a constant steady speed segment, then a constant deceleration segment (no S-curve acceleration yet).
- Between adjacent printing moves, nonzero instantaneous change in speed is allowed up to the limits set by M566. This is necessary when printing GCode which uses line segments to approximate curves, which is the way slicers generate GCode from STL models. A printing move is one that has both XY movement and forward extrusion.
- Between adjacent travel moves, or adjacent printing moves, or travel moves and printing moves, instantaneous speed changes are not allowed. This means that unless the two moves are collinear, the head must come to a stop at the boundary between the moves,.
Re: Motion system evaluation process for new printers April 04, 2018 06:36PM |
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Re: Motion system evaluation process for new printers April 11, 2018 09:03PM |
Registered: 10 years ago Posts: 239 |