Smoothing concave and convex curves
I have cut a series of elongated S curves on a 25mm thick radiata pine board 140mm wide . The curves vary in radius, but are around the 300-400mm radius.
I am having a lot of trouble getting the curves smooth, on both sides of the cut.
I have used my Makita jigsaw with a Festool timber curve cutting blade, and also used a bandsaw, but the end result after sanding by hand with a sheet of sandpaper folder in four is a series of bumps.
The most difficult is the concave cut ( the inner side of a U cut)
Can anyone please advise the best way to get the concave and convex sides of this cut very smooth?