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Making your own calibration panels

Problems, solutions and discussion about scanning with a video projector and stripe patterns.

Making your own calibration panels

Postby formwurx » Thu Jun 23, 2016 1:07 pm

Hi

I'm planning on making my own calibration panels to scan objects smaller than 1cm, has anyone any experience of doing this themselves? I'm using a sls3 system. thanks.
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Re: Making your own calibration panels

Postby fred_dot_u » Thu Jun 23, 2016 6:22 pm

I've created a set of panels about 300 mm on a side, using glass mirror panes. Mirrors have to be perfectly flat in most cases, as any distortion is immediately obvious. I used a flat black paint to provide for a clean surface and avoid dangerous reflections. It was relatively easy to secure the panels in aluminum angle material, with silicone adhesive, also ensuring ninety-degree facings throughout.

For your smaller size requirements, 300 mm would be a bit overkill, but it's the calibration page that matters. You can install any size page on a 300 mm panel, but smaller ones would be easier to manage. Getting a glass cutter to absolutely insure squareness might be a bit challenging. For such a small target, any error in placement will be magnified when compared to the larger sized options.
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Re: Making your own calibration panels

Postby Alfa » Sat Jul 23, 2016 1:51 pm

Waht is the material in the original David panels? I do not think there is a mirror.
I want to make panels in Alubond 4 mm(Aluminium composite panel).
http://www.ebay.de/itm/Aluverbundplatte ... SpkzuI9G-g
What do you think about it?
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Re: Making your own calibration panels

Postby micr0 » Sat Jul 23, 2016 7:37 pm

Alfa wrote:Waht is the material in the original David panels? I do not think there is a mirror.
I want to make panels in Alubond 4 mm(Aluminium composite panel).
http://www.ebay.de/itm/Aluverbundplatte ... SpkzuI9G-g
What do you think about it?


Aluminum like that isn't usually very flat. When I need flat AL I use cast Al plate that is normalized and finished (usually ground) flat. The best ready made, cheap, flat surface is glass.
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Re: Making your own calibration panels

Postby Alfa » Sat Jul 23, 2016 8:49 pm

Look at this panels of BjoernReinke:
viewtopic.php?f=15&t=5762
He used the plywood and paper but look at result. It was excellent.
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Re: Making your own calibration panels

Postby drndadoo » Mon Jul 25, 2016 8:44 am

DAVID Calibration panels are made of glass. If you will use Alu plates you have to be aware that they can change form easily.
They are also temperature sensitive.
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Re: Making your own calibration panels

Postby Alfa » Mon Jul 25, 2016 9:19 am

And before you making the panel of cardboard, and only now of glass? And what about the quality of the scan, it was improved?
Incidentally, I did not write abut Alu plates, there is 3mm HP plastic in it.
Thickness of aluminum in two sides only 0.5 mm.
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Re: Making your own calibration panels

Postby drndadoo » Tue Jul 26, 2016 12:29 pm

We were making calibration panels from paper, PVC, alu, but the glass is the best. They are heavy but they do not change the form.
With glass panels the calibration will be precise as long as you use them.
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Re: Making your own calibration panels

Postby Alfa » Tue Jul 26, 2016 12:30 pm

I agree. Thanks.
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Re: Making your own calibration panels

Postby formwurx » Sun Jul 31, 2016 10:43 am

Thankyou all for your responses - it looks like glass is the best/cheapest way to go.
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Re: Making your own calibration panels

Postby robssm » Wed Aug 24, 2016 12:42 am

the absolutely best way to do it I have just done is to take some rather thin pieces of glass, use plastidip and spray the back of the panels white, then I had a vinyl decal made which I applied to the panels and then sprayed the front of the panels with matte clear. Then I used a set of 6 inch v blocks to ensure it both stood up and was perfectly right angle. The results were insane... So much better accuracy.
OS: WIN7
CPU: Core i7
GPU: GTX560m
RAM: 16GB
CAM: DMK20213UM
Projector: 3M Pocket Projector and LG PA75U
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Re: Making your own calibration panels

Postby avogra » Wed Aug 24, 2016 8:09 am

Want to see a picture! :)
Projector: Acer K11 with Achromat f=400mm | Cameras: 2x Logitech 9000 Pro with custom C-Mount body | Lenses: 1x Computar M1214-MP, 1x Computar M5018-MP, 1x Schneider-Kreuznach Cinegon CNG 1.4/12
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Re: Making your own calibration panels

Postby hunkatibor2 » Wed Aug 24, 2016 10:15 am

Hi
YES !!
Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
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Re: Making your own calibration panels

Postby micr0 » Wed Aug 24, 2016 2:45 pm

How well does the plastidip adhere to the glass? I made all of my panels roughly the same way as you did, however I use flat white sign vinyl as the base. Its a pain to apply to larger panels without air bubbles (even with layout fluid) but it sticks very well and protects the glass from edge chipping well too. FWIW, for the black markers, I just cut them out of flat black vinyl. No need to coat them afterward.
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Re: Making your own calibration panels

Postby robssm » Thu Aug 25, 2016 2:08 am

https://www.facebook.com/photo.php?fbid ... =3&theater

https://www.facebook.com/photo.php?fbid ... =3&theater


maybe this will work..

But, yes, the plastidip adheres nicely and makes a very good matte surface. As for the vinyl, well, I didn't have any matte vinyl at the time and I didn't want them to walk around since out here, its so dry sometimes something so small will not adhere very well, so I used the matte finish to hold the edges down just in case.
OS: WIN7
CPU: Core i7
GPU: GTX560m
RAM: 16GB
CAM: DMK20213UM
Projector: 3M Pocket Projector and LG PA75U
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