Colchester Multiturn 4000

The Colchester Multiturn 4000 combines a 104 mm (4.1 in) spindle bore with bed lengths up to 4,000 mm (157.5 in), which makes it the long-shaft and pipe machine of the mid-size Multiturn models. Swing over the bed is 554 mm (21.8 in). The spindle is rated 11 kW (14.8 hp) over 1 - 2,000 rpm on a D1-11 camlock nose, with a 12 in (305 mm) chuck.

Four bed lengths are listed: 1,500 / 2,000 / 3,000 / 4,000 mm (59.1 / 78.7 / 118.1 / 157.5 in) between centres. Work of that length is rarely made in volume. A single roll journal, a replacement piston rod or a length of threaded pipe is typical, and ShopTurn on the Siemens 828D lets the operator build each one from cycles at the machine.

Power is the figure to weigh. 11 kW (14.8 hp) matches the smaller Multiturn 3000, and the Harrison Alpha 1550XS on the same geometry is rated 15 kW (20.1 hp). On long, slender work that seldom matters, because the cut is limited by deflection well before the motor. On short, large-diameter parts in the 830 mm (32.7 in) gap it will be felt.

Swing over the cross slide is 370 mm (14.6 in). The standard tailstock is manual and the standard chip handling is a roll-out swarf bin, so for the longer beds the optional swarf conveyor, hydraulic tailstock and steady rests are worth pricing in from the start. Colchester describes the bedways as hardened and ground cast iron.