Err. what would you want square delrin drawplates for?
I could make you some, but (A) they’d be an incredible PITA to make,
and (B) they probably wouldn’t hold up long. Or © do what you
You see round plates because they’re easy to make, and Delrin
smoothing plates are sort of the cheap way out, rather than buying
massively expensive large steel ones, if all you’re doing is
smoothing down chain.
To do square, you’d first have to make up a set of square broaching
cutters, which would be expensive. (or a set of square drillbits,
which is almost as much fun.) (Really, you can drill a square hole.
Google it.) Then you’d have to make the plates, relieve the holes,
etc. And they still wouldn’t be hard enough to do more than smooth
woven wire or chain. The center sections would wear preferentially,
and there’s no guarantee that woven wire would even notice the
corners, while I can pretty much guarantee that chain wouldn’t care.
Which explains why nobody makes them commercially.
What were you thinking to do with them?