is there a formula for the gap you make? I did .013 on boards that are a final of 26" long. It might be a bit heavy. There is likely a point where there is a too much and be certain considerations type of wood, board width etc but maybe not. Never came up with the old guy but know had I asked there would have been a good answer or answers, there always was.
I know a few of you here do them any thoughts gap related to length?
While not what I want to ask consider a table top with 8 boards 6 inches wide. If done all with spring joints then your table top will be sunk in in width in the middle some amount. Easy enough to calculate when you know your gap.
thanks,
w