CoreXY construction question August 07, 2018 02:54PM |
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Re: CoreXY construction question August 07, 2018 03:42PM |
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Re: CoreXY construction question August 07, 2018 03:54PM |
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Re: CoreXY construction question August 07, 2018 04:49PM |
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Re: CoreXY construction question August 07, 2018 04:59PM |
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Re: CoreXY construction question August 08, 2018 01:54AM |
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Re: CoreXY construction question August 08, 2018 09:00AM |
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Re: CoreXY construction question August 08, 2018 02:16PM |
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Re: CoreXY construction question August 08, 2018 02:25PM |
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Re: CoreXY construction question August 08, 2018 02:37PM |
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Re: CoreXY construction question August 08, 2018 03:45PM |
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Re: CoreXY construction question August 08, 2018 03:57PM |
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In addition to the stability of X carriage, there is also stability of Y carriage. Belts located on one side of the XY plane will bend Y guiding rails. If you do not see it now, once you move to a longer Y or you will increase speed it will show itself. Plus crossing/twisting belts will result in belt rubbing idlers edges. There is no perfect solution each one is a trade-off.Quote
the_digital_dentist
You could build a corexy mechanism with the belts on the same Z level, crossing them at the back and twisting them so the smooth back sides rub against each other, then bring the belts to the extruder carriage at the same Z level (back to back and just touching) and almost completely eliminate all the torque on the extruder carriage.
Re: CoreXY construction question August 08, 2018 04:07PM |
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Re: CoreXY construction question August 08, 2018 04:13PM |
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Re: CoreXY construction question August 08, 2018 05:47PM |
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Re: CoreXY construction question August 09, 2018 08:09AM |
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Re: CoreXY construction question August 09, 2018 08:53AM |
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Re: CoreXY construction question August 09, 2018 10:11AM |
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Rotate your drawing plane 90 degrees around X and look at XZ plane.Quote
the_digital_dentist
This pretty much explains Y axis stability:
Re: CoreXY construction question August 09, 2018 01:57PM |
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Re: CoreXY construction question August 09, 2018 02:58PM |
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Re: CoreXY construction question August 09, 2018 03:03PM |
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Re: CoreXY construction question August 09, 2018 03:30PM |
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Re: CoreXY construction question August 09, 2018 03:49PM |
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Re: CoreXY construction question August 09, 2018 04:04PM |
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It is all a trade-off. What I like about my design is that structure is kept by belts, printed parts, and 8mm rods even on 1CF (300x300 bed) and it may run up to 300 mm/s But it is your decision what to tradeQuote
the_digital_dentist
You will eliminate torque about the Z axis, but you'll still have rotational torque about the Y axis because the belts will be attaching to the extruder carriage with vertical separation on both sides of the carriage.
Re: CoreXY construction question August 09, 2018 04:25PM |
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Re: CoreXY construction question August 09, 2018 09:39PM |
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Quote
piper3d
If you are trying to show design I used, the downside is rotating forces around Y axis of X carriage see above .
It is all a trade-off. What I like about my design is that structure is kept by belts, printed parts, and 8mm rods even on 1CF (300x300 bed) and it may run up to 300 mm/s But it is your decision what to tradeQuote
the_digital_dentist
You will eliminate torque about the Z axis, but you'll still have rotational torque about the Y axis because the belts will be attaching to the extruder carriage with vertical separation on both sides of the carriage.
Re: CoreXY construction question August 09, 2018 11:28PM |
Registered: 6 years ago Posts: 134 |
If you will expand your printer to have a 1mx1m print bed you will start seeing those forces. If you will try running your printer at speeds 400mm/s+ and acceleration 5000mm/s2+ you will see the influence. The same applies to my machine - I do not see those torque forces while printing at 300mm/s, but I do know they exist (reposting from another thread https://youtu.be/D-Es5PkO1gk it is not a perfect run just 2 sides came out fine I still have to improved extruder).Quote
the_digital_dentist
Does it matter? Not that I can tell.
Re: CoreXY construction question August 10, 2018 01:25AM |
Registered: 5 years ago Posts: 155 |