From: New Family of 3-DOF UP-Equivalent Parallel Mechanisms with High Rotational Capability
{L i }
MG of {L i }
{R(O, u)}{R(O, v)} {G(k)}
uRvRkRRP, uRvRkRPR, uRvRkPRR, uRvRkRRR, uvUkRRP, uvUkRPR, uvUkPRR, uvUkRRR