Quick question so I can understand a bit clearer.
From what I can make out from the picks Art's setup (Using Rainea's convention of Y being across the gantry and X being along the table) has the laser in the XZ plane (with tilt) and Sid has it in the YZ. Also looking at the data it appears that both of your field of views is wide enough to see your whole hand so you are scanning it in one pass. Am I right so far? Art is still working on "tileing" to do wider subjects with successive passes or strips which are merged later into one mesh.
It's kinda early and I need more cofee but check out the drawing below to get a better idea of my setup. I thought that I did it the same as Art? Maybe not??
Yes, FOV is wide enough to see my whole hand. "Tileing does work", it's just kinda funky- check out the 32" wrench I scanned yesterday- it's posted on the Mach Cloud Thread
I am curious what resolution in Z you are getting with your current setups. Ie scan a smooth vertical wedge and figure out how many steps it is interpolating in the scan.
Not a clue about my resolution. What do you mean 'scan a smooth vertical wedge'- I guess I could try to scan something to figure it out but there are a lot of variables that you need to provide (what size wedge- a drawing would be helpful, how is this wedge oriented on the table, what do you want the step to be)?
I posted in another thread that I think the ideal resolution would be from 1:1 to 2:1 the cutting resolution of the machine. Does that sound right? If it does then on a camera with 700 odd pixels in the horizontal (the security b/w cam I'm testing) the max FOV would be something around 35mm to 70mm for a machine that can cut to 0.1mm. This would obviously get better if you had say a 6Mega pixel camera with 3000 pixels in the horizontal. What size cameras are you guys using?
Maybe the coffee still needs to kick in but I really don't understand what you mean by 1:1 or 2:1. Maybe you could explain. I am using a cheapie webcam rightnow and I don't know the resolution but I will check. I think is set at 640x480 and who knows the megapixels (actually it's probably not even MEGA). Sorry I can't tell you more.
I can say that I have taken some measurements and my camera is approximately 10" above the Z0. I am using a FOV setting of around 42 and getting some OK P.C. acquisitions. But I am beginning to see what you guys are talking about in terms of position, alignment and distortion and I think that I may have to try some camera laser posititions to get less distorted scans
Thanks,
Sid