... curves from straight to a curve and mid way along the curve it transitions back to a straight. Using John's suggestion of using a tangent straight has got me so close, but not quite, at least not yet. I'll continue tomorrow when I've got a clear head. posted: 9 Nov 2008 04:48 from: Martin Wynne Yes, I know, I'm my own worst enemy. But it's near impossible to watch folks getting a bit stuck and not chip in with some help. Here's a very scruffy video. curly_corner_short.png The yellow templates represent the rest of the track plan. The starting templates are straight, but everything would work the same way if they were gently curved, to the same or differing radii. 1. Choose the radius for the finished centre curve. Here I made it 3000mm. 2. Add on a few mm for the transition offset (shift). I allowed 5mm, making 3005mm. 3. Make that the second radius of a zero-length transition and move it along into tangency with the other track ...