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So, there is a good bit of space in the center.

Could the delta handle a rotary tool in there to do engraving and minor cutting in soft material if a mount was designed to replace the extruder? I'm sure weight would be an issue, but I don't how much. Would the belts stretch before the arms would warp?

One thing I'm thinking is that the actually cutting wouldn't have perfect sides because the nature of the delta would tilt the bit slightly towards the direction of the highest of the three axis. Is my understanding accurate?

Edit: Watched the video at http://www.youtube.com/watch?v=QvVms9Aq_KE and realized the platform is flat the entire time. Nice.

Some have used the H1 for lightweight CNC work. No reason that couldn't be done with the Delta as well. Within reason. Of course, for CNC work, you start with an object and are taking away (as opposed to building up), so your effective maximum working depth is the length of the cutting tool.

Actually, the nature of the Delta is that the platform shouldn't tilt at all, I think. Movement of any axis results in horizontal and vertical movement, but not rotational movement. The paired arms constrain that from three different directions.

Yeah, I understand depth really would be limited, but something like cutting out layers of foam board to assemble those layers into something else could be done. Or one of those dinosaur puzzles like this but smaller.
[img]http://2.bp.blogspot.com/-E7J2zUDNOTk/T ... 0/dino.jpg[/img]

Oh, that's what the paired arms accomplish. Thanks!