Having chosen vector U1 (u, o) as a free choice in this case, we only have to solve for one dyad, WZ. Though we arbitrarily choose the length of vector U1, the resulting function generator linkage can be scaled up or down to suit packaging constraints with- out affecting the input/output relation defined in equation 5.36, because it is a function of angles only. This fact is not true for the motion or path generation cases, as scaling them will change the absolute coordinates of the path or motion output precision points which were specified in the problem statement.
Having chosen vector U1 (u, o) as a free choice in this case, we only have to solve for one dyad, WZ. Though we arbitrarily choose the length of vector U1, the resulting function generator linkage can be scaled up or down to suit packaging constraints with- out affecting the input/output relation defined in equation 5.36, because it is a function of angles only. This fact is not true for the motion or path generation cases, as scaling them will change the absolute coordinates of the path or motion output precision points which were specified in the problem statement.
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