... low speed.4.) The machines are suitable for drilling, hole-expansion, reaming, bevel edge, and tapping, for surface milling, step ... speed change and max spindle speed(3000rpm/6000rpm), suitable for drilling, tapping, boring and milling with high speed.Model TX32ZB: ... stepless speed and automatic speed change suitable for tapping and drilling with large torque.Model TX32A: the worktable is extended. ...