Weldon Midas

The Weldon Midas is a CNC cylindrical grinder with 16 in (406 mm) of swing and 25 in (635 mm) between centers, offered in four versions that differ at the wheel. The S-2 and A-2 have a 20 hp (14.9 kW) motor and a wheel 20 in (508 mm) in diameter by 4.0 in (102 mm) wide. The S-3 and A-3 step up to 25 hp (18.6 kW) and a 24 in (610 mm) by 5.0 in (127 mm) wheel. The wheelhead angle is factory set at 0° or 30°.

A turret wheelhead is the option that changes what the machine can do. Each wheel position has its own integral 31.5 hp (23.5 kW) spindle motor, and the turret indexes to +/- 1.5 arc second, so a second wheel can be brought to the part without taking it out of the centers. The turret machine weighs 21,600 lb (9,798 kg), against 19,800 lb (8,981 kg) for the S-2 and A-2 and 20,100 lb (9,117 kg) for the S-3 and A-3.

Under the table, Z is a FANUC linear motor and X runs on precision ground preloaded ballscrews, with 15.25 in (387 mm) of wheel slide travel and 43 in (1,092 mm) of worktable travel. The guideways are hardened and ground rails of the cross-roller type. Wheel speed is infinitely variable around the nominal 8,500 SFPM, which lets surface speed be held as the wheel wears down in diameter.

Parts up to 300 lb (136 kg) go between #5 Morse centers. The workhead has a 6 in A2 (ASME) nose, a 1.0625 in (27 mm) through hole and a 5.0 hp (3.7 kW) FANUC AC servo, infinitely variable from 0 to 900 rpm. The tailstock quill retracts 1.5 in (38 mm) by manual lever. A 24 in (610 mm) swing is available as an option.

The machine is 130 x 91 x 93 in (3,302 x 2,311 x 2,362 mm) (W x D x H) on a welded steel Shear Damper base, and it needs 480 VAC, 3-phase, 60 Hz power and 5 SCFM of air at 80 psi.