Sorry, I saw the "(not circle)" and assumed it was not going to be a circle.

No problem starting with a trammel point to cut a female template, though.

No problem with a circle-cutting jig and a bandsaw to cut a male jig.

Allow your offset for the collar, and note that you cut in opposite
directions with the router when using female versus male jigs.

wrote in message
...
George,

how do I get the round template to start with?

rough out w/ jigsaw then sand? just curious

On Thu, 9 Dec 2004 07:42:31 -0500, "George" george@least wrote:

Teach me to change dimensions in mid-thought. Change the 1/2 bit to 3/8.

Or, use 1/4 differences with the 1/2 bit.

"George" george@least wrote in message
...
Use your collars. Lay out your desired opening on a sheet of template
material. Now determine your bit/collar difference for cutting. Say
you're
using 1/2" bit and a 3/4" collar. Nail your fencing strips 3/4" away
from
the layout lines. Now cut the pattern (it'll be 3/8" too large in both
dimensions), remove the fences, use your new template to cut your
openings,
which will, of course be 3/8 smaller because of the bit/collar
difference.
.

wrote in message
news I'm building blast gates.

I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd
cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect
fit.

I'm guessing the router is the way to go, but can you lead me to some
hints and tips, pictures, or other suggestions?

Thanks,