anular ring 134 the flex spline 130 is geared to a circular spline 136 to which is bolted an output gear 138 the harmonic drive 28 provides a 61 to 1 gear reduction between the pulley 34 and the output gear 138 so that the rotational orientation of the output gear 138 and thus the punch 16 can be precisely determined while increasing the torque the harmonic drive 28 can be repositioned somewhat to insure snug engagement of the output gear 138 with the geared bushing 26 thereby minimizing backlash the lower turret 24 includes the harmonic drive 92 which provides a similar gear reduction the lower harmonic drive 92 includes a shaft 140 secured to a pulley 142 which is connected by a key 144 to an oldham coupling 146 which in turn is linked to a wave generator 148 the wave generator 148 is spring loaded to a flex spline 150 which in turn is geared to a circular spline 152 the circular spline 152 is bolted to a shaft 154 which connects it to the lower output gear 100 the lower output gear 100 drives the geared bushing 102 which rotates the indexable die 22 for a lower drive a gear set is spring loaded to take out backlash in a fixed center distance drive fig6 shows a friction brake 158 for retaining the indexable punch 16 when motor 18 is not engaged the friction break 158 includes.