Colchester Magnum HD CNC 1135

Eight spindle bores, from 154 mm (6.1 in) to 420 mm (16.5 in), are listed for the Colchester Magnum HD CNC 1135. With a swing over the bed of 1,135 mm (44.7 in) it belongs to the upper pair of Magnum HD heavy-duty CNC lathes, which have a different headstock family and more power than the two smaller models.

The base motor is 30 kW (40.2 hp), and 37 kW (49.6 hp) or 45 kW (60.3 hp) can be specified. Spindle noses are given as a span, A2-11 to A2-28, and the table states a maximum speed for each bore in turn: 700 / 550 / 500 / 500 / 500 / 400 / 400 / 300 rpm. So the smallest bore turns fastest, and the 420 mm (16.5 in) bore is a 300 rpm spindle.

A shorter bed appears here too. Distance between centres starts at 1.5 m and continues 2 / 3 / 4 / 5 / 6 m, which suits short, very large parts such as valve bodies, wheel hubs and flanged spools as well as long pipe. Swing over the cross slide is 875 mm (34.4 in). The page gives no swing-in-gap figure for this model.

Everything else follows the series pattern. The bed is a one-piece floor-type casting, the spindle alloy steel on opposed taper roller bearings, the headstock a 4-step auto change variable speed unit. A 4-way hydraulic tool post and rear swarf conveyor with cart are standard, with hydraulic power chucks, rear chucks, steady rests and a driven tool turret among the options. Buyers should agree the exact bore, nose and motor combination in writing, since the table lists them as ranges.