Swingman wrote:

X = (S - (W*N))/(N + 1)

whe

X = spacing in inches
S = Space to be filled with slats of a desired width
W = Desired width of slat
N = Number of slats desired


In addition to the considerations expressed about inaccuracies and measuring,
you should modify your formula to divide by N - 1 (not N + 1). For example, with
5 slats, there are 4 spaces between them...

JeffB