Tapping in a Vertical Mode

Manufacturing Engineering, Mar 2005

Intended for both the tool room and production facilities, model VTC 30A/30B vertical tapping centers from Romi Machine Tools Ltd. (Erlanger, KY) can serve in mixed-volume, short-run operations as well as high-volume work.

These VTCs have a 44.8 × 84.64'' (1138 × 2150-mm) footprint. Rapid traverse rates are 1653 ipm (42 m/min) in X and Y and 1772 ipm (45 f m/min) in Z. Programmable milling speed is 394 ipm (10 m/min).

The system's servomotors directly, drive ballscrews, and on the VTC 3OA an automatic tool turret with 10-tool capacity helps minimize cycle time. Its index time is 1.3 sec station-to-station., The VTC 3OB has a 20-tool double-arm ATC that helps the system achieve an index time of 0.8 sec.

Employing a headstock built around a 7.5-hp (5.6-kW) AC spindle motor and a pulley and poly-V belt, the ISO 30 spindle achieves speeds ranging from 8 to 8000 rpm (12-12,000 rpm is optional). Maximum speed for rigid tapping is 394 ipm (10 m/min). Table work surface measures 19.68 × 12.59'' (500 × 320 mm). Travel in X, Y, Z is 17.32 × 11.42 × 10.62'' (440 × 290 × 270-mm). Positioning accuracy in all axes is 0.00019'' (0.0048 mm) and repeatability in all axes is 0.00012'' (0.00305 mm). Circle 302