What youy are describing sounds very similar to this:


De Cristoforo's Complete Book of Power Tools
Library of Congress Catalog Card Number 72-90935
SBN: 60-010999-8

See discussion of the rotojig pages 69 through 76 in the first section
on Table Saws.

I constructed one of these jigs in the early eighties.The jig shown
will accomodate a spindle diameter of 2.75 in. ( Assumptions: 10 in
dia blade with a 3 in cut ). If you require a larger diameter, you
could scale up the dimensions accordingly.