How about beveling the edges of some 1X, rather than the full triangle?
The cheap saws at Lowes are priceless for this kind of stuff.
Use a good blade, set the fence carefully, and get to work!
Of course you could do it on a router table or with a circular saw.
Wilson
wrote in message
ups.com...
subject says it all, I don't yet own a table saw and I was wondering if
I can manage without it for this job (I have to put up quite some crown
molding around my house) or if the time has come to invest in it as
well: given how things are I thought about going the triangular backing
route to install it (so I don't have to worry about joists etc.) but I
am at a loss about how to go in ripping triangular backing with a circ
saw...

It's just that up to now I've been doing fine with circ+miter+jig saws
and I'm really wondering if the table saw would just end up collecting
dust after this project.