1 Topic by bobswika

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Topic: Left laser higher

Hello, I am 99% positive my lasers are spot on where they intersect at the center of the platform and that they are exactly vertical. The cross hairs are exactly over each other and on the center of the blue line when a test is done. Both lasers are scanning exactly the same size. One last issue I have is the scan from the left laser is maybe 1mm higher than the scan from the right laser.

My question is could this be caused by the camera not being perfectly level in the horizontal plane. It does appear to be but I'm wonder if it was off a tiny bit if it could account for the slight difference in height between sides. If I tilt it slightly to the right will it lower the image captured on that side. Before I go adjusting I just want to know if this has the potential to be my problem. Thanks as always for any advice.

Bob

2 Reply by n2ri

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Re: Left laser higher

could also be turn table related someplace between it and lasers mounts could be off that much easy.

Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs

3 Reply by bobswika

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Re: Left laser higher

Possibly but it is consistent no matter where the table is turned, through the whole 360 degrees of rotation. Thanks.

4 Reply by n2ri

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Re: Left laser higher

bobswika wrote:

Possibly but it is consistent no matter where the table is turned, through the whole 360 degrees of rotation. Thanks.

thats not what I meant. the Motor is mounted to part of the multi part enclosure and as there are 2 sides with several parts between the motor and lasers perfect alignment is impossible to such tolerances without tweaking each connection. though still not an issue for scanning

Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs

5 Reply by bobswika

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Re: Left laser higher

Does anyone know what effect tilting the camera in the horizontal plane has?  Wil it raise/lower one side of the scanned image?  Thanks.

6 Reply by pirvan

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Re: Left laser higher

bobswika wrote:

Possibly but it is consistent no matter where the table is turned, through the whole 360 degrees of rotation. Thanks.

Hey Bob,  I though you sorted these things out before. 

This "new" problem sounds more like the old one when you had the double shell.  Could it be this is actually the same as before, but you're looking at it from the wrong angle?

To print or, 3D print, that is the question...
SD3 printer w/too many mods,  Printrbot Simple Maker Ed.,  FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.

7 Reply by pirvan

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Re: Left laser higher

bobswika wrote:

Does anyone know what effect tilting the camera in the horizontal plane has?  Wil it raise/lower one side of the scanned image?  Thanks.

If you're referring to up or down tilt, your scan will taper in those directions, and if you have the tiniest of deviation in the laser alignment, it will show up as one shell will taper more than the other.  so they may be touching at the bottom, but totally separate at the top.

To print or, 3D print, that is the question...
SD3 printer w/too many mods,  Printrbot Simple Maker Ed.,  FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.

8 Reply by bobswika

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Re: Left laser higher

Hi Pirvan,

Thanks to your tips my shells at the top and bottom meet nicely, no double shell, and I am getting good scans.  Maybe I'm getting too picky.  I guess I'm having a hard time explaining what I mean.  For example if I scan a cylinder where the scan from the left laser meets the scan from the left laser if looking at it from the top view they meet perfectly, both at the top of the cylinder and the bottom.

If I look at the scan from the front where the scans meet the right side is about 1mm higher.  This is consistent from the top of the scan to the bottom.  Both scans are the same vertical length overall.  The right is just slightly higher both at the top and bottom.  I am having a hard time capturing this in a picture.

I know that the camera must be perfectly vertical and not tipped at all forward or backwards when looking at the scanner from behind.  What I was wondering is, again looking from behind the scanner, what effect turning the camera in the clockwise or counter clockwise would have.  If the checker board calibration pattern was on the screen this would be changing how the vertical and horizontal red lines matched up to the lines on the checker board pattern.  I attached a screen capture of a scan, not sure if you can tell from the picture but the right side is ever so slightly higher than the left.  Thanks,

http://soliforum.com/i/?hIO71DS.jpgBob

9 Reply by n2ri

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Re: Left laser higher

optical illusion? with how threads look maybe

Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs

10 Reply by bobswika

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Re: Left laser higher

No it's also visible in Meshlab. It was at least easily smooth out in mesmixer. Thanks.

11 Reply by hairu526

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Re: Left laser higher

I can't tell by looking at the linked photo.  Is it a problem after mesh reconstruction is done?

- Uriah

12 Reply by bobswika

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Re: Left laser higher

It could be seen in the point cloud as well but became more visible after the mesh reconstruction was done.

Since installing the new left laser it is now not an issue. Still might not be 100% perfect but you have to look really hard to see it. Either the crisp new laser helped or my alignment is better. Thanks a lot the support here is great.

Bob