I’m making some save-the-dates for family.
We are using natural wood. They are “circular” but because it’s natural, they are varying shapes and sizes, so making a jig will not work. They are about 8mm-10mm thick
What I’m seeing is that if I lay down 9 pieces and use the camera, everything looks fine in Luban and lines up, but the actual engraving is off in the direction they sit.
So, my center one is perfect. The ones that are on camera to the left are shifted to the left, and so on.
Is there a way to fix the parallax effect?
Never read about parallaxing issues with the camera capture ..
Unfortunately i never used the whole build plate size with varying object sizes.
How many engravings are you supposed to do?
What’s your object and engraving size?
May you share an example?
I’m thinking of a template which marks the center of each engraving where you put your object pieces on..
Hopefully some other users jump in.
This a an AFTER pic. You can see how the engravings all shifted based on where they are.
Items to the left are shifted lift for example.
Everything was centered properly during the first scan when they were blank.
What one would like in this application is called a “Telecentric” image. Telecentric imaging systems have the same magnification at all angles - across the entire field of view. They are commonly used in manufacturing (robot pick and place systems) and in optical metrology. They are expensive to make and the Snapmaker camera is certainly NOT telecentric. It is possible to get a passably telecentric image by software post-processing, but apparently Luban does not do that.
Unfortunately - what I’m saying is, as far as I know; if you want to use the camera over such a wide field of view, and really care about alignment of image to reality, your screwed. With the existing camera and software anyway.
It looks like a scaling factor might help compensate for this as it seems that all the misalignment radiates from the centre. I have no idea how to apply this to the whole layout.
Of course, this would scale down the size of the image too and one would have to upscale the master image by the same amount before applying the downscale of the whole layout.
Some tests with paper or card would be necessary. Only worth doing if you plan on lasering 100 pieces or so.
I would laser circles out of cardboard where you put your objects in. The cardboard should stay on the buildplate.
The circles should stay in your Luban project so you can center your engraving pictures, simply don’t generate the gcode for the circle (again) or don’t export it.
The problem with that is thst not only are the items not perfectly round but they also vary in size. Sometimes up to 1.5 inch difference in diameter.
Then just laser bigger holes in the template and just keep the mid of it as references.
Snapmaker also noticed camera is not that easy and so we dont get one in 40w or 20w. And yes, with mey 10W i had also problems. But it forced me to do templates and this works quite well.
The problem with this is still the irregular shapes and sizes.
They are natural tree branches but aren’t perfect circles so trying to find the mid for each individual piece would be just as off.
