[airbrush]

How to hold thin wood ply 1/16"

just double back tape? I have some carpet tape i could use?
What about cutting through...does it gum up the mill, pull up etc??

-or just cut but leave a thin onion skin to hold it...?

[cgallery]

You could use my binder-clip hold down:

http://www.cnczone.com/forums/work-f...38500-cnc.html

If you aren't going all the way through, though, it would be sub-optimum as thin material can move up/down in the middle which would impact pocketing depth.

[Little_Chips]

You could use a down spiral end mill or maybe a straight flute and a vacuum table or perhaps the edge clips mentioned by CG. I have used double sided sticky tape and spray-on contact adhesive and both are a pain in the _ _ _.