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Spline drive could allow for extremely fast and precise FDM printers

Posted by neversettles1 
Spline drive could allow for extremely fast and precise FDM printers
July 22, 2019 04:26PM
3D printers should become much faster, and more precise.

Belts are slightly elastic and at high speed with high jerk they will and do stretch momentarily and create small artifacts in the print product.

We can get an extremely fast and precise 3d printer by replacing belt drive with spline drive:


The axis gears should be double helical so that there is no vibration from the gears.

The rest of the design is left to the reader
Attachments:
open | download - spline-drive.jpg (227.7 KB)
Re: Spline drive could allow for extremely fast and precise FDM printers
July 23, 2019 03:13AM
Dunning–Kruger ? Humor ?

Edited 1 time(s). Last edit at 07/23/2019 03:16AM by MKSA.


"A comical prototype doesn't mean a dumb idea is possible" (Thunderf00t)
Re: Spline drive could allow for extremely fast and precise FDM printers
July 23, 2019 03:47AM
If you ignore the play in the joints and the spline as well as the increased rotational mass and the high cost for the gear, joints and spline it all makes sense, somehow.


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Re: Spline drive could allow for extremely fast and precise FDM printers
July 23, 2019 01:14PM
@neversettles1 I am afraid that your sketch doesn't convey enough information to see where you think there may be an improvement. Can you give a bit more info on how you see this working?

Mike

p.s., It is strange how, since messrs Dunning and Kruger published their paper their names have most often been invoked by those in whom the DK force is largest. I wonder if they allow themselves a wry smile.
Re: Spline drive could allow for extremely fast and precise FDM printers
July 23, 2019 03:18PM
Quote
leadinglights
@neversettles1 I am afraid that your sketch doesn't convey enough information to see where you think there may be an improvement. Can you give a bit more info on how you see this working?

Mike

p.s., It is strange how, since messrs Dunning and Kruger published their paper their names have most often been invoked by those in whom the DK force is largest. I wonder if they allow themselves a wry smile.

From the OP: "The rest of the design is left to the reader"

Please do, may be you will understand the irrelevance and absurdity of the claim.


"A comical prototype doesn't mean a dumb idea is possible" (Thunderf00t)
Re: Spline drive could allow for extremely fast and precise FDM printers
July 28, 2019 09:42AM
Cant remember the name of the printer which had xy bed running on splined rods...not sure it really took off.


[mechabits.co.uk]
Re: Spline drive could allow for extremely fast and precise FDM printers
July 28, 2019 11:35AM
@MechaBits

you thinking of this [www.youtube.com] ?
Re: Spline drive could allow for extremely fast and precise FDM printers
July 28, 2019 02:41PM
Quote
Dust
@MechaBits

you thinking of this [www.youtube.com] ?

Yeah thats the type but it was on a cheaper looking printer, think it had perspex lid.

Edited 1 time(s). Last edit at 07/28/2019 02:44PM by MechaBits.


[mechabits.co.uk]
Re: Spline drive could allow for extremely fast and precise FDM printers
July 29, 2019 04:06AM
Quote
MechaBits
Quote
Dust
@MechaBits

you thinking of this [www.youtube.com] ?

Yeah thats the type but it was on a cheaper looking printer, think it had perspex lid.

This is an ingenious design but I fail to see how you could compare it with the "proposal" above. I bet Everman would be insulted by this comparison.

Note also the smart way the steppers are mounted.

Most probably the 3D printer based on it was doomed by the moving XY bed.

Edited 2 time(s). Last edit at 07/29/2019 08:36AM by MKSA.


"A comical prototype doesn't mean a dumb idea is possible" (Thunderf00t)
Re: Spline drive could allow for extremely fast and precise FDM printers
July 29, 2019 11:03AM
Well the example above looks like a rack & pinion designed by Heath Robinson but the title says Spline so I thought I was helping to show options.


[mechabits.co.uk]
Re: Spline drive could allow for extremely fast and precise FDM printers
August 08, 2019 10:07PM
Quote
neversettles1
3D printers should become much faster, and more precise.

Compared to what? What is your reference printer? How much faster and more precise should they get? How do the artifacts caused by belts stretching compare to artifacts caused by imperfect extrusion? How does that compare to artifacts created by using two phase stepper motors?

Quote
neversettles1
Belts are slightly elastic and at high speed with high jerk they will and do stretch momentarily and create small artifacts in the print product.

We can get an extremely fast and precise 3d printer by replacing belt drive with spline drive:

How do you know it will get faster and be more precise using spline drive? Why do you need to add a long spline and two universal joints to a mechanism to turn a fixed pinion gear that drives the bed or extruder carriage back and forth? How much will the spline shaft twist under acceleration and what sort of artifacts will that create in the prints? What about the universal joints - as they wear a develop play, what will that do you your print quality?

Quote
neversettles1
The axis gears should be double helical so that there is no vibration from the gears.

How much will the high quality gears cost and where can I get them? How often will the pinion gear have to be replaced as it will wear much faster than the rack?

Quote
neversettles1
The rest of the design is left to the reader

Thanks!


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: Spline drive could allow for extremely fast and precise FDM printers
August 18, 2019 10:49AM
The Spline looks like it would push better than rotate.


[mechabits.co.uk]
Re: Spline drive could allow for extremely fast and precise FDM printers
August 19, 2019 07:09AM
100% sure this is a troll. Makes a vague comment on a forum with a vague drawing, doesn't reply for a month etc.


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