Okuma VTM-65

The Okuma VTM-65 sits at the small end of the VTM turn-mill line: a turning table for parts up to 650 mm (25.59 in) in diameter and 500 mm (19.7 in) tall, paired with a CAT 40 (BT 40) milling spindle. The table drive is listed at 30/22 kW (40/30 hp) and runs from 10 to 1,250 rpm. Travels are 500 mm (19.69 in) in X and 635 mm (25.0 in) in Z.

Weight sets the size of the job as much as diameter does. The table is rated for 500 kg (1,102 lb), and that has to cover the chuck or fixture as well as the part. A solid steel blank at the full diameter and height would weigh well over that, so the whole envelope is only usable for hollow or light-alloy work: housings, rings, wheels and thin-walled castings. For dense parts, work back from the load figure instead of the 650 mm diameter.

Milling is done by a spindle rated 22/15 kW (30/20 hp). That is machining-center power, not a small driven tool, so bolt circles, flats, ports and pockets can be finished in the same clamping as the turned diameters instead of going to a second machine. Tooling is ordinary 40-taper holders.

Moving up the range changes the envelope, not the motor. The VTM-80YB turns 800 mm (31.50 in) and the VTM-100 turns 1,000 mm (39.37 in), and both list the same 30/22 kW (40/30 hp) rating as this machine. A shop whose parts stay inside 650 mm therefore gets the same turning power from the VTM-65, with a table speed that reaches 1,250 rpm for the smaller diameters this size of work involves.