Strange problem with verticality

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Strange problem with verticality

jon_bondy
I have been printing parts that were designed to have vertical walls,
but the walls are not vertical.  I looked at the layers as generated by
my slicer, and the vertical walls were moving from layer to layer.  I
tried a different slicer, with the same results. This is all explained
better in the OpenSCAD source file.

I have attached the SCAD file as well as the generated STL file: I hope
they make it.  Any thoughts?  I'm using 2015-3-2 on Windows 10.

Jon




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Re: Strange problem with verticality

MichaelAtOz
Administrator

Netfabb says it is 10.8mm wide which is as you specified.

Adding
color("blue",0.4) {
translate([-ar,-0.25,-0.5]) cube([ar*2,0.5,1]);
translate([-ar,-0.25,20-0.5]) cube([ar*2,0.5,1]);

Then using Netfabb rulers;

means you have problems with your slicers...
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Re: Strange problem with verticality

Ronaldo
I tried the stl file with Slic3r and all layers of vertical walls are equal. I used Repetier with parallel projection. Are you sure you are not visualizing it with perspective projection?

2016-07-24 23:49 GMT-03:00 MichaelAtOz <[hidden email]>:
<http://forum.openscad.org/file/n17970/Anomoly.jpg>
Netfabb says it is 10.8mm wide which is as you specified.

Adding
color("blue",0.4) {
translate([-ar,-0.25,-0.5]) cube([ar*2,0.5,1]);
translate([-ar,-0.25,20-0.5]) cube([ar*2,0.5,1]);

Then using Netfabb rulers;
<http://forum.openscad.org/file/n17970/Anomoly_rules.jpg>
means you have problems with your slicers...



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Re: Strange problem with verticality

jon_bondy

And there you have it.  Perspective projection.

This still leaves me with prints that are wrong, but at least now I can view things correctly (thank you!).  I now have NO idea why the prints are as they are.

Thanks again

Jon


On 7/24/2016 11:06 PM, Ronaldo Persiano wrote:
I tried the stl file with Slic3r and all layers of vertical walls are equal. I used Repetier with parallel projection. Are you sure you are not visualizing it with perspective projection?



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Re: Strange problem with verticality

MichaelAtOz
Administrator
Tends to be a slipping coupling, pully or belt, if you print at slow speeds it is reduced; the jerk at high speeds shows it up.
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Re: Strange problem with verticality

jon_bondy
This would be good advice ... except that my machine uses lead screws on
all axes.  I will ponder further.  Thanks!


On 7/25/2016 8:13 AM, MichaelAtOz wrote:
> Tends to be a slipping coupling, pully or belt, if you print at slow speeds
> it is reduced; the jerk at high speeds shows it up.
>
>
>


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Re: Strange problem with verticality

bytemedwb
Could be cumulative error due to a slight difference in step/mm calibration.

On 7/25/16 10:18 AM, jon wrote:

> This would be good advice ... except that my machine uses lead screws
> on all axes.  I will ponder further.  Thanks!
>
>
> On 7/25/2016 8:13 AM, MichaelAtOz wrote:
>> Tends to be a slipping coupling, pully or belt, if you print at slow
>> speeds
>> it is reduced; the jerk at high speeds shows it up.
>>
>>
>>
>
>
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Re: Strange problem with verticality

MichaelAtOz
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In reply to this post by jon_bondy
Then your steppers are losing steps/skipping?
Admin - email* me if you need anything,
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Re: Strange problem with verticality

jon_bondy
Thanks for the thought, but in fact the remainder of the print is
pristine, so that is not the problem.


On 7/25/2016 5:30 PM, MichaelAtOz wrote:

> Then your steppers are losing steps/skipping
> <http://machinedesign.com/motorsdrives/why-open-loop-steppers-lose-steps-and-how-solve-problem>
> ?
>
>
>
> -----
> Admin - PM me if you need anything, or if I've done something stupid...
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> Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.
>
> The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
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> View this message in context: http://forum.openscad.org/Strange-problem-with-verticality-tp17969p17976.html
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Re: Strange problem with verticality

Ronaldo
How exactly are your prints not vertical? Are they slanted, growing bigger at each layer? Or what?

2016-07-25 18:35 GMT-03:00 jon <[hidden email]>:
Thanks for the thought, but in fact the remainder of the print is pristine, so that is not the problem.



On 7/25/2016 5:30 PM, MichaelAtOz wrote:
Then your steppers are losing steps/skipping
<http://machinedesign.com/motorsdrives/why-open-loop-steppers-lose-steps-and-how-solve-problem>
?



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Re: Strange problem with verticality

Greg Frost
Slipping pulley.

Sent from my iPhone

On 26 Jul 2016, at 7:31 AM, Ronaldo Persiano <[hidden email]> wrote:

How exactly are your prints not vertical? Are they slanted, growing bigger at each layer? Or what?

2016-07-25 18:35 GMT-03:00 jon <[hidden email]>:
Thanks for the thought, but in fact the remainder of the print is pristine, so that is not the problem.



On 7/25/2016 5:30 PM, MichaelAtOz wrote:
Then your steppers are losing steps/skipping
<http://machinedesign.com/motorsdrives/why-open-loop-steppers-lose-steps-and-how-solve-problem>
?



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Re: Strange problem with verticality

jon_bondy
In reply to this post by Ronaldo

One small portion of the print has a vertical surface that is at a slight angle.  The result is that a part that is supposed to  mate with it fails to mate.  The rest of the print is pristine.

Jon


On 7/25/2016 6:01 PM, Ronaldo Persiano wrote:
How exactly are your prints not vertical? Are they slanted, growing bigger at each layer? Or what?

2016-07-25 18:35 GMT-03:00 jon <[hidden email]>:
Thanks for the thought, but in fact the remainder of the print is pristine, so that is not the problem.



On 7/25/2016 5:30 PM, MichaelAtOz wrote:
Then your steppers are losing steps/skipping
<http://machinedesign.com/motorsdrives/why-open-loop-steppers-lose-steps-and-how-solve-problem>
?



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Re: Strange problem with verticality

jon_bondy
In reply to this post by Greg Frost

No pulleys.  Lead screws.  But thanks for the thought.


On 7/25/2016 6:05 PM, Greg Frost wrote:
Slipping pulley.

Sent from my iPhone

On 26 Jul 2016, at 7:31 AM, Ronaldo Persiano <[hidden email]> wrote:

How exactly are your prints not vertical? Are they slanted, growing bigger at each layer? Or what?

2016-07-25 18:35 GMT-03:00 jon <[hidden email]>:
Thanks for the thought, but in fact the remainder of the print is pristine, so that is not the problem.



On 7/25/2016 5:30 PM, MichaelAtOz wrote:
Then your steppers are losing steps/skipping
<http://machinedesign.com/motorsdrives/why-open-loop-steppers-lose-steps-and-how-solve-problem>
?



-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
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Re: Strange problem with verticality

Ronaldo
I checked the stl file again with Repetier and there is no flaws like you mentioned. I would suggest you to print it again in another table position.

2016-07-25 19:25 GMT-03:00 jon <[hidden email]>:

No pulleys.  Lead screws.  But thanks for the thought.


On 7/25/2016 6:05 PM, Greg Frost wrote:
Slipping pulley.

Sent from my iPhone

On 26 Jul 2016, at 7:31 AM, Ronaldo Persiano <[hidden email]> wrote:

How exactly are your prints not vertical? Are they slanted, growing bigger at each layer? Or what?

2016-07-25 18:35 GMT-03:00 jon <[hidden email]>:
Thanks for the thought, but in fact the remainder of the print is pristine, so that is not the problem.



On 7/25/2016 5:30 PM, MichaelAtOz wrote:
Then your steppers are losing steps/skipping
<http://machinedesign.com/motorsdrives/why-open-loop-steppers-lose-steps-and-how-solve-problem>
?



-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
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Re: Strange problem with verticality

Parkinbot
to me this looks like some warping has happened ...