I'm trying to put a _very_ subtle curve on the bottom of some table aprons. I've placed some nails in the apron templates at the appropriate points and used a piece of 1/8th" thick wood to try to draw a fair curve but, (whether I drink to much coffee or I'm just not good at drawing), I'm not liking the resulting lines, so I'm hoping I'll get more perfect results by using a (_very_) long trammel arm on my router to do this.
The height of each arc will be 1/4" above the baseline of each apron. The center point of the long aprons is 25-3/8ths from each end, and for the short aprons the center is 9". Like I said, these are going to be very subtle curves, but visually important and I want them perfect. ;>
How would I compute the radii of the circles I would need to give me the arcs for each apron?
(Alternatively, is there another method that doesn't rely on how steady my drawing hand is in order to do this?) :)
Michael "Shakey" Baglio