In some discussion a few days ago, I asked Butch if he cut corner slots using a sabre saw. If so, how did he do it? Turned out he was referring to the outside radius. He used home made guide on his router that cut slots off the outside edge of the track and then by each slot as the guide. Pretty much the way we all do it.
I have always thought about a wide blade in my sabre saw to cut corners free hand. I got a couple blades yesterday and this morning cut the "T" end off one of them and ground the coating off the back edge of the blades. Put them in a vise and used the wire welder to do a couple spots on the back edge of the blade. Kind of ground them smooth at the top 1 inch or so of the new blade and didn't worry with the rest of the edge. This was the result.
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It was easy to cut free hand with no wobble in the slot. I have a change in one corner of my track and the curve will be irregular and I think drawing it out and cutting it freehand like this will be much easier then using the router and flexible fence and the saw dust that goes everywhere. If this works out pretty good, it gives the option of turning on the saw and free handing whatever looks good with no setup or tear down.
Obviously there will need to be supports underneath that will keep the tack sections in place when they are cut all the way thru. I can see cutting the slot about half way, screwing a 2X4 underneath that section in 2-3 places then continuing the cut the rest of the way.