I need to punch many 1/4", 3/8" and 1/2" square holes in .018" styrene. Is there a ready made punch set for sale ? If not, how might I go about making a punch/die set ? I have a relatively well stocked workshop including drillpress and small arbor press. I've tried using a drillpress woodmortice chisel but it leave ragged edges for some reason. Also ... I need to punch holes up to six inches from the edge of the styrene so a craft store paper punch probably won't work unless can alter it somehow. Any hints, tips or advice would be appreciated.
Thanks, Frank Cordes Lakes, AZ.
p.s. BTW, I'm using the styrene to make lampshades.