i have a 5 x 12 router with a rotary and some time ago the z drive would trip "limit switch" if i ran it passed 50ipm and now the drive on the side opposite x0 y0 consistently runs 3/8 from the reset switch block no matter turning the machine off, clamping the switch closed, tighten the turn buckle and switch the machine on ... run a tool path and hit zero out and it is 3/8" from the limit stop