I had a Hersch (?) saw table (sic) many years ago that did this. You
could mount a circular saw, jig saw, or router under the table.

Mike

boorite wrote:
If you want a scroll saw, but your wallet suffers from a severe
impaction, then a thing like this will either fill your scrolling needs
or convince you to get out the crowbar. Either way, to me it's worth
the price (pretty much free). I hope it at least amuses.

http://woodslacker.officeweasel.com/jigscroll.html