1 Topic by C_D (edited by C_D 2016-08-07 06:47:07)

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Topic: Scaling Issues

Im pretty happy with the visual quality of the scans I am getting now, but I have some pretty serious scaling issues. Attached is an STL of a test block I scanned. This is a 3D printed block which measures 40 x 40 x 100 mm. The STL generated from the FreeLSS point cloud looks excellent, it has straight sides and looks right, but it measures 21.5x21.5x74mm. So my X and Y dimensions are about 50% under size and the Z dimension is about 75% under size.

Does this point to any particular calibration setting which I may have incorrect?

EDIT:
Actually uploaded the file this time.

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40mm Block Rotated.stl 244.22 kb, 6 downloads since 2016-08-07 

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2 Reply by pirvan

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Re: Scaling Issues

Measure the distance from the face of the camera to the center of the turntable, and make sure it matches the Laser left & right Z value (usually 10.5") on the settings Atlas settings page.  That will govern the height.

Measure the distance from the center of the laser to the center of the camera on both left and right sides.  These are the Laser X values.  The left value should be entered as a negative number.  This will give you the correct width.

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.

3 Reply by C_D (edited by C_D 2016-08-09 08:36:12)

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Re: Scaling Issues

Well, on closer inspection it seems my Z value was out by 100mm due to a typo. Probably fairly important...

Also as Uriah mentions below, after any settings changes you must recalibrate the lasers!

4 Reply by hairu526

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Re: Scaling Issues

Make sure you recalibrate the lasers after making changes such as these, by clicking the "Calibrate Lasers" button with the calibration item oriented correctly.

5 Reply by C_D (edited by C_D 2016-08-09 08:34:25)

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Re: Scaling Issues

hairu526 wrote:

Make sure you recalibrate the lasers after making changes such as these...

An excellent point. That hadn't crossed my mind!

It appears if you don't do this, all sorts of weird things happen. Previous results are rubbish so I am editing that post so as not to confuse people.