Thanks to all who contributed.
It's unanimous; tubing notchers are more of an inconvenience. The one builder on the BreezyBuilders Yahoo! group who does use one successfully, says he only uses his for 90º notches. Everything else is snips and grinder.
But, he suggested a wonderful little freeware tube coping utility called Tubemiter, that allows you to use your computer printer to print out a flat "pattern." Available here: http://www.ozhpv.org.au/shed/files/tubemiter.exe If you prefer not to do metric conversions, an online SAE version can be found here: http://www.metalgeek.com/static/cope.pcgi
For clusters where a compound angle is required, he offered a particularly clever technique:
----- Original Message -----
From: Jeff Point
Sent: Tuesday, February 02, 2010 12:25
Subject: Re: [breezybuilders] Notchers...
"Here's a little trick I found with Tubemiter- say you have a cluster where a
tube meets a 90 deg joint at, say, 30 deg to one tube (thus 60 deg to the
other.) What you can do it set up Tubemiter for the 30 deg joint and print it
out. Now, take that piece of paper and feed it back into your printer, so that
the next one will print on top of the first. Go back into tubemiter and set it
up for a 120 deg joint (or 90 deg added to whatever the first angle was.) This
will produce, essentially a 60 deg miter turned around 180 deg. Now, print this
one on top of the first one. Take your scissors and cut out the template,
cutting out the areas that are common to both. Viola, you have a perfect
template for the angle."
I hope someone finds this info as useful as I did.
If God had intended for man to fly he would have given him a keen mind and the desire to do so. Oh, wait...