When it comes to making BIG circles, you need a pair of trammel points. This set, sold by Rockler, is very nice. I really like the wooden handles and brass fittings. They not only look good, they also feel good in your hands, and work great for large radius projects.
In the set, you get two needle points and #2 pencil lead. There’s on board storage for the tips and lead inside the handle. You’ll need to make your own beam to connect the points.
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Trammel Points #39394
$20
Rockler
(800) 279-4441
Can I purchase the Trammel #39394 points from you direct, I live in Scotland.UK.
They are 27.99 on Rockler's site.