I purchased some 1"x3"x6' poplar to size to 2" wide. What better saw to use than the track saw. I cut one side and measured from that side. I still have a 1/16" bow in the length. Is there a technique, hands, clamps, presure?
You might be pushing the saw laterally in the middle of the guide rail causing deflection in the cut. I've done that with my TS55 on the 3000mm guide rail until I figured out that I was the cause and adjusted the direction of force as I travel with the saw. Could also be stresses in the wood being released after the cut.
I am guessing that with stock that narrow, the rail is not clamped to the material solidly enough over the full 6' length, and it is moving slightly on you whilst you cut.
I have had this problem. And it has almost always been because of tension in the wood being released. Make your rip cut an 1/8" too wide. In this case 2 1/8" so you can retrim just a little off to straighten.
Thanks for the insight. I thought it could be me. I will try the cut a little large and let it destress then cut to final dimension. Any way the wood did work out quit nicely. I was working on a face frame for some storage in my cellar workshop. Nothing special just my first attempt at a cabinet.
I would pinch dog the piece to something the same thickness but a little wider to hold it all more securely. First cut with the crown away from the cut line. http://www.leevalley.com/en/wood/page.aspx?p=31158&cat=1,43456,57657
The advice about over cutting to release stress is also a very good idea.