silverchris published a new build:

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This is my first attempt at designing using v-slot or t-slot, so any feedback on my design would be appreciated. In my head it seems like it should be sturdy, and functional for a frame?

 

Thanks Mark, a sealed enclosure is planned
My current thoughts on the process is get the movement figured out, and get the optics and electronics all functional, and then get the laser tube as well as enclose it.
I updated the picture on the build page, as well as included a link to the sketchup 3d warehouse of the WIP 3d model.

 

Both
I am using a corexy design, which uses two motors and belts tied to the Y gantry, that when coordinated move both the X and Y with the two motors.
The corexy site has a good overview CoreXY | Cartesian Motion Platform

 

Some progress has been made, though I am having some issues.
I managed to get the frame assembled, though I am having a little bit of an issue with the X gantry having what feels like a lot of wobble/wiggle in it. E.G. when I grab one side of it, I can pull it back a little bit, or pull it forward before the other side starts to move.
I have a feeling that it comes from my frame not being perfectly straight, so this week, I think I am going to pull it apart, and check the squareness of the cuts on the ends of the t slot/v slot, and double check the lengths are all the same.

Also, this photo clearly shows that I need more shop space

 

I have found a few examples of people using the core X-Y design. A slipped belt would just result in the cut being off, as the mirrors have to be in alignment across the whole table, the only way the beam would miss the laser head is if one of the mirrors was misaligned on the mount

 

I should have taken a video of the the wobble, but I think it's a bit excessive to be the flexibility of the 20x20, it might be a few centimeters each way, and the 20x20 doesn't feel like it would flex that much in the hand. I think the mini-v wheels aren't being allowed to sit flat in the v slot, letting them have a lot more side to side play in the v slot than they should? I will have to do some playing tomorrow, as I didn't really check if the amount of play changed when I rolled it along to a different part.

 

I ended up taking it apart, and probably should have done this before I started... I checked the lengths of the pieces, and it seemed they varied a few millimeters from the company the cut the t slot, as well as the ends not being very square at all.
Having a local machine shop mill them straight, which will affect my finished size a bit, but at least it will be square

 

Still seems like I have excessive slop in the movement?
Actually remembered to record a video of it. The rest of the frame doesn't seem to flex at all during this, so I am not sure if its flex in the piece I have going across, or play in the mini-v plates?