I'm with DK on this one. I knew I would be using Gargraves track and Ross turnouts when I started my layout. I gave Steve at Ross my hand drawn trackplan and layout measurements. He converted it to a scaled out plan and identified all the different radii of track needed with the exception of the "custom curves". He also identified all the turnouts and prepared an full items list and put the package together for me to purchase and pick-up. Fabrication of the "custom" curve trackage was kept to a minimum. Best part, it all went together very smoothly.
Dave and Kerrigan are right! Use a jig and go slow! Its tough but it sure is nice when done!
FWIW, Here are some screen shots of an older thread discussing flex track jigs. You might find the dimensions for the curve radius on the jigs useful, and the photos of the actual jigs to bend the track.
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I concur that if you can get sectional curves, that's the easiest way to go. If you want an odd diameter, make a jig and go for it. I find it very useful when I'm "here" and need to get "there". For random pieces, I just bend it on my gut. For a sweeping curve, two screws to anchor it on one end. Then work your way down the length and add screws to hold it as needed.
Doesn't look like this part has been mentioned. AFTER you bend it, you'll want to cut the ends square again.
