Some of the Sash pieces had bowed, fortunately I'd left enough on to correct this. After setting the saw up really accurately ( as mentioned before it didn't come out of the box accurate) I set to work sawing to within about 3mm of the finished sizes. The bowed ones I screwed at the ends on the convex side to a straight piece that then slid along fence.
Then it was down to planing. I need these really accurate so I could get all the joints bang on without having to make little adjustments to suit.
With the thicknesser I recon the average tolerance is about +/- 0.2mm
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