Belted Z axis conversion for Ender-3 April 11, 2019 04:36PM |
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Re: Belted Z axis conversion for Ender-3 April 11, 2019 05:29PM |
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Re: Belted Z axis conversion for Ender-3 April 11, 2019 10:34PM |
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Re: Belted Z axis conversion for Ender-3 April 11, 2019 10:51PM |
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the_digital_dentist
One of the early versions of the Z axis in my corexy printer was made with a single belt lifting two ends of the bed support, and had a worm gear to stop the bed from dropping.
Re: Belted Z axis conversion for Ender-3 April 12, 2019 02:09AM |
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Re: Belted Z axis conversion for Ender-3 April 12, 2019 08:25AM |
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klcjr89
How exactly do I calculate the steps per mm with a worm drive setup with a 2GT belt?
Re: Belted Z axis conversion for Ender-3 April 12, 2019 09:02AM |
Registered: 12 years ago Posts: 5,796 |
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Pippy
Wonder why you decided to go with belts rather than leadscrews, it's interesting ?
I see people using the white steel reinfored belts when used on the Z axis, I guess to try to reduce ringing and stretching ?
Re: Belted Z axis conversion for Ender-3 April 12, 2019 09:03AM |
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Re: Belted Z axis conversion for Ender-3 April 12, 2019 09:05AM |
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warbunniex
If ya wanna try to make the worm gear yourself, I got a step file right here & a link to an imgur page explaining how to model your own. i think my worm gear here is only 1:13.
[www.thingiverse.com]
Re: Belted Z axis conversion for Ender-3 April 12, 2019 11:28AM |
Registered: 12 years ago Posts: 5,796 |
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warbunniex
If ya wanna try to make the worm gear yourself, I got a step file right here & a link to an imgur page explaining how to model your own. i think my worm gear here is only 1:13. [www.thingiverse.com]
Re: Belted Z axis conversion for Ender-3 April 12, 2019 08:02PM |
Registered: 7 years ago Posts: 207 |
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the_digital_dentist
Just divide by the gear ratio. Example: a 40 tooth pulley moves 80 mm/rev of the output shaft. Output shaft turns once for 20 turns of motor shaft. 20 turns of the motor shaft is 20 x200=4000 full steps. 16 usteps per full step means 4000x16= 64000 usteps moves the bed or x axis 80 mm. 64000/80 = 800 usteps/mm. 800/16 = 50 full steps/mm, so you'll want to set layer thickness and z hop on retraction to multiples of 20 um. Most of the time I print in 0.2 mm layers and I set Z hop to a multiple of 4 full steps - 0.8 mm to minimize Z artifacts.
Re: Belted Z axis conversion for Ender-3 April 13, 2019 12:12AM |
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Re: Belted Z axis conversion for Ender-3 April 13, 2019 12:13AM |
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the_digital_dentist
A 20 tooth pulley will move the bed 40 mm per rev. The motor is 200 steps/rev. 200/40 is 5 steps per mm. If it usteps at 16:1, 5 x 16 = 80 usteps/mm. If you use a 40:1 worm gear drive, 80 x 40 = 3200 usteps/mm.
Re: Belted Z axis conversion for Ender-3 April 13, 2019 12:39AM |
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Re: Belted Z axis conversion for Ender-3 April 13, 2019 01:42PM |
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the_digital_dentist
In a printer that throws the heavy bed back and forth on the Y axis, or lifts it in the Z axis, I think wide belts are a good idea. If you're lifting the relatively lightweight X axis and the belts aren't going to be very long, 6mm wide belts should be fine.
Re: Belted Z axis conversion for Ender-3 April 13, 2019 01:59PM |
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Re: Belted Z axis conversion for Ender-3 April 13, 2019 02:00PM |
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Re: Belted Z axis conversion for Ender-3 April 14, 2019 07:54PM |
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Re: Belted Z axis conversion for Ender-3 April 16, 2019 03:18AM |
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Re: Belted Z axis conversion for Ender-3 April 16, 2019 02:52PM |
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Re: Belted Z axis conversion for Ender-3 April 16, 2019 09:31PM |
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WesBrooks
Any measurements on the level of backlash on a standard direct drive GT2 belt, belt reduction, and worm reduction?
I had been thinking about belt reduction on the x/y for small nozzle stuff. Worm would be neater, but I'm concerned aboit backlash.
Re: Belted Z axis conversion for Ender-3 April 17, 2019 01:55AM |
Registered: 10 years ago Posts: 383 |
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MKSA
Lead screw also have backlash.
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MKSA
For X and Y, I wouldn't use worm gear...
What you gain in resolution, you loose in speed, accel .
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MKSA
With the standard set up, GT2 and 20 teeth, my carriage plus direct drive and hot end (220g) can move safely at 300mm/s for non print move and the resolution is enough.
So I didn't try it. Easy to do though.
Re: Belted Z axis conversion for Ender-3 April 26, 2019 12:14PM |
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Re: Belted Z axis conversion for Ender-3 April 29, 2019 02:25PM |
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Re: Belted Z axis conversion for Ender-3 April 30, 2019 07:30AM |
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Re: Belted Z axis conversion for Ender-3 April 30, 2019 07:37AM |
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Re: Belted Z axis conversion for Ender-3 April 30, 2019 07:38AM |
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Re: Belted Z axis conversion for Ender-3 April 30, 2019 09:18AM |
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claustro
I am following this very interesting thread.
@klcjr89 can I ask you haw much you payed for the worm gear and the gear?
thank you
Andrea
Re: Belted Z axis conversion for Ender-3 April 30, 2019 12:10PM |
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Re: Belted Z axis conversion for Ender-3 April 30, 2019 12:37PM |
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the_digital_dentist
I'm no fan of flat plate printed plastic motor mounts, and I'm not too sure about separating the motor mount/worm gear from the disc gear. The last thing you want is for the relative positions of the gears to change under load because that will change the position of whatever is being lifted by the belt(s). Flimsy motor and disc gear mounts will flex and do just that.
If you're going to use printed plastic parts to hold the gears, they need to be very bulky to ensure absolute minimal flex. This is what I used in an experimental printed worm gear box:
That tiny motor was lifting the 3.5 kg bed assembly in my printer at 10-15 mm per sec.
You may have to modify the layout of the machine to accomodate a really solid printed motor mount. That's life. You either build it so it will be solid and have a chance of working properly, or you do it half-assed and increase the probability of failure.