Please don't get me wrong, I may sound aggressive but it is pure despair not anger. I do appreciate your feedback. I'm pleased with the information you provided. I'm pleased with your responsiveness. I'm pleased that you have confirmed that my figures on the screen resolution are ok. But as I stated before I don't seem to get my head around the problem I currently have at hand. Reading through the forum I notice people having the same problem so I'm asking to bear with me while I fully explain where I'm coming from.Where I come from.
Being a newbie -in 3D scanning, cameras, lasers, step motors, controllers and PC connections- it is hard to make simple decisions that experience users make without realizing they made a decision. This is my story:
One fine day I find the DAVID scanner web page. I think cool great I wanted to do such things already a long time. I look around in the house; find a laser and a web cam and quickly create a setup with the free version. I'm happy with the first results (taking into account these are the first scans so precision should increase over time with skill) so I buy the soft.
In the end I'm not pleased by the increase of the scan precision . I do a better setup, a bigger setup, a higher camera resolution, buy a good camera but for none of the setups I'm happy with the scan outcome. It is the precision that is not as good as I want it.
So I read and read and change the setting of the camera. Results improve but not enough to satisfy me. So I look at buying a better camera (+100 euro) or a new laser (+100 euro) or a laser mover (+100 euro as I want it ready to run without calibration panels)
This becomes lots of money so I would feel better not having to buy them all in one go.I would
even feel better if I'd know for sure that I did reach the end of the possibilities of my current hardware.
Unfortunately I haven't found a way to do so right now.
Therefore I decided to create a thread so I could get some ballpark figures. I'm still hoping to get those because I know I need to buy a laser but is it really necessary for me to by the LC532-5-3-F(16x65) 178,5 euro plus a wall plug 16,9 euro?
Or will the LC650-5-5-F(14x45)-NT (99,9 euro) do?My worse David nightmare would be to buy the 99 euro laser not being happy with the result then buy the 178 euro laser to find out I could have done with the laser I had in the beginning. Being a newbie I am allowed to not having a clue.
I feel that if I would know "How to calculate maximum scan precision with a given hardware" I would be better positioned to answer my own questions and so would other newbie's. Maybe this is a wrong feeling. If so please tell me how I can know?What are the remaining parameters I have to find out?
The parts of the scanning hardware are:
1) The camera
2) The laser
3) The calibration board
4) The laser mover
I'll go into each of what I've understood till now:The camera:
I know the numbers of the limits of the camera (see above). But are these figures real? I mean: did anyone ever reach 0.25 mm scan precision in 600X480?
If not what is the limit?The laser:
I know green is better than red but by how far? I also read somewhere that the width of the beam is important. But that is about all I know from the laser. Is the width of the laser beam the maximum precision? If not; is there a relation between the 2?
I notice that the shop doesn't mention the beam width. Does that mean it is not important after al?The calibration Board:
This one is nicely documented. Thanks for that. If I understand correctly the board has no impact on the precision.The laser mover:
As far as I understand the laser mover should not increase the precision.
Hope it is clear what I want to achieve.
Rereading my post I notice that maybe it is not clear what I mean with precision. With precision I mean the smallest object that can be scanned. So assume you scan a flat surface with rectangular dots with increasing size. What is the smallest dot (x,y,z) that will be correctly scanned.