Hi all
I building some solution for 3d scanner artec eva ,i have one eva(3d scanner) but i want it to turn around like this
its look like turntable but inverse,so the problem is i don't know how it work that it can turn around but
base that someone stand on it dont move
cloud you guy explained how it can turn around.
help me pls,sorry for my eng.
i can't read any of the stuff in that video but the mechanics look reasonably straightforward (at least in theory).
There is a base on the floor that does not move. There is a short vertical shaft to the non moving platform that the mans stands on. There is a moving "wheel" that is free to rotate on the shaft and arms from the wheel support the rotating structure.
Imagine a bicycle wheel removed from the bike and turned on its side. Fix the lower end of the axle onto something that sits on the floor and fit some form of platform onto the top part of the axle. Then the axle won't turn but the wheel will be free to do so.
Or have I completely misunderstood the question?
...R
The hard part will be stiffness and vibration, both may causes degradation of scan quality - so you
need a light, stiff and damped arm from the central bearing supporting the scanner, ie a space-frame
or similar, so that the scanner is pointing accurately at the axis of the table, not wobbling or flexing
about.
However a handheld scanner is likely to have software to do all the correction for random movement
already, so it may not matter (it would, for instance, using a kinect and OpenCV)
Assuming you're making this human-sized like in the video you'd just need a large bearing. You can find "lazy susan" bearings that would fit the job.
Chagrin:
You can find "lazy susan" bearings that would fit the job.
I don't think it is that simple.
You would need two lazy-susans one on top of the other. And some means to connect the top plate to the very bottom plate so they are both stationary,
...R
You would need two lazy-susans one on top of the other.
Why? They do make "hollow" lazy susan bearings. Good place for a suitable pillar to mount a platform.
justone:
Why? They do make "hollow" lazy susan bearings. Good place for a suitable pillar to mount a platform.
I guess I have not seen any with a hole through them. To the best of my knowledge they are designed for compression loads. To achieve that I believe the OP requires would require the top disk of the lazy susan to support the bottom disk in tension.
And at what stage does it stop being a lazy susan and just become a ball-race?
...R
I'm still trying to figure out how two lazy susans one on top of the other is going to work?
What would keep the top one from spinning?
Why over think this?
The lazy susan just supports and allows the 3d equpment to move around the person standing in the center hole. Hole not big enough? Then a stand can be made so the person is standing over the rotating part.
justone:
The lazy susan just supports and allows the 3d equpment to move around the person standing in the center hole. Hole not big enough? Then a stand can be made so the person is standing over the rotating part.
Now I think I get what is in your mind.
But if I struggled, maybe the OP will also. How about posting a diagram.
...R
OK here is a simple section view.
LZ!.pdf (13.3 KB)
You people got me so curious, I went out to the shop to examine a lazy Susan from a reclining lounge chair. The chair was very heavy and then add a 250 lb person, It must be capable of supporting, perhaps 1,000 lbs. Then the question becomes, could the center bolt, if replaced, support a platform with a person? I took pictures and then, with difficulty, removed the center pin.
The pin is a 3/8 inch carriage bolt with a nylon washer on the side that turns. A person with a metal lathe could turn a piece of steel rod, perhaps 3/4 inch in diameter to 3/8 inch and add threads to replace the original bolt.
Then weld braces and a platform on top of the 3/4 inch rod for a person to stand on. The top part of the lazy Susan could then be turned independently of the floor plate and the person on the platform.
Paul
I would cut out the center of the lazy susan - make the center "bolt" a piece of 6-inch pipe. Then you can stand lots of things on that very rigidly.
Or suspend the scanning head from above? Then you can park an army tank underneath it if required.
Robin2:
I guess I have not seen any with a hole through them.
OK, second chance then. You CAN find lazy susan bearings that will fit the job.
Well, using only Eva it's impossible to create Shapify like scanning process. I mean in Shapify Scanning parts move on circle traecrory only. If you try to move Eva round the object on a constant height you will be able to scan only a small part of your object (a circle part just in front of the scanner). To scan all the object, no matter human or something else you need to move Eva round each part of object on different angels. So you shouls stand on Lasy Susan and operate Eva, while the bearing moves you round the object. Or i think there is a way to automatise the process. You can use a RoboticScan instead of your own hand. As i see this robotic hand is quite new Artec invention but I think it may work.
