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Zeroing X Y with a camera

Posted: Tue Sep 01, 2015 3:39 pm
by veng1
There is an interesting topic on the Carbide 3D forums that I thought I'd point out here. Of course, Will has already found it.

http://community.carbide3d.com/t/new-zero-camera/485

After a good bit of discussion, it links to the following:

http://beatty-robotics.com/zeroing-a-cnc/

Beatty Robotics uses a microscope camera to set the zero point of the X and Y but don't really have anything new in their article about setting Z. I'm think about using an IR Z- height sensor from the 3D printing world that is used for automatic bed tramming and adapting it to a SO3 in order to, hopefully, work with materials that are not electrically conductive. I spend a lot of time cutting glass filled polyester shapes that are not flat and would like to automatically detect the Z location.

Has anyone else looked at this problem?

Re: Zeroing X Y with a camera

Posted: Tue Sep 01, 2015 3:45 pm
by WillAdams
veng1 wrote:Will has already found it.
For those who're curious, it's on the Upgrade Overview page: http://www.shapeoko.com/wiki/index.php/ ... view#Other

There was a similar system w/ cross-hairs, which would move the camera out of the way, then punch at the location at my first job out of college. Worked quite well (depending on the patience of the operator).

Re: Zeroing X Y with a camera

Posted: Tue Sep 01, 2015 3:48 pm
by Gadgetman!
For Z, just add a 45degree mirror in a corner of the camera's field of view...

Re: Zeroing X Y with a camera

Posted: Tue Sep 01, 2015 4:14 pm
by CalebPeters
I played around with zeroing X Y with a camera on my SO 2. It works good for me.

Here's a link to my build log post on it.

The problem I see with using a IR Z-height sensor is that the end of the bit is never at a pre-definable distance from the sensor. In my opinion, carbide3d's Nomad is using the best system to determine Z-height.