# ReelToReel12D

ReelToReel1[cnum, point1, rad1, point2, rad2, dist, C] models a pair of pulleys connected by a single cable. The rotational positions of the pulleys are related as per their respective radii and their separation distance.
• The constant C sets the initial rotational position of the pulleys.
ReelToReel1 constrains one degree of freedom.

• The constant C, which sets the initial rotation of the pulleys, is given by the formula C = (rad1 e1 - rad2 e2) where e1 and e2 are determined in the following way. Place the two sprockets in any valid position and construct a vector from point1 to point2. e1 is the angle, measured in radians, from the constructed vector to the local x axis of the first sprocket and e2 is the angle from the constructed vector to the x axis of the second sprocket.
ReelToReel1 is functionally identical to
TwoPulleys1 except that the angular orientation of the two pulleys is effected by their separation distance.
• If the Euler solution method is specified, ReelToReel1 generates two constraints, and adds one extra variable to the model.
ReelToReel1[cnum, point1, rad1, {sym, guess}, point2, rad2, dist, C] can be used to explicitly specify the name of the extra variable, and its initial guess. Otherwise, a symbol of the form cnum is used.
• The second, and optional third, equation in ReelToReel1 relates the rotation angles of the two pulleys.