Harrison Alpha 1660XS

Six bed lengths, from 1,500 mm (59.1 in) to 6,000 mm (236.2 in) between centres, are offered on the Harrison Alpha 1660XS. It is a large flat-bed CNC/manual combination lathe with a 660 mm (26.0 in) swing over the bed, an 18.5 kW (24.8 hp) spindle and a choice of two spindle configurations.

The table gives those configurations as pairs. Spindle bore is 104 / 155 mm (4.1 / 6.1 in), spindle nose is D1-11 camlock / A2-11, and the speed range is 26 - 2,000 / 10 - 1,400 rpm. Read together, the smaller bore is the faster spindle and the 155 mm (6.1 in) bore runs slower on a bolted A2 nose. Check the pairing with Colchester, since the page does not spell it out. Chuck sizes are listed as 16 / 20 / 24 in (406 / 508 / 610 mm).

So the buyer is choosing between speed and through-bore. With the larger bore, flanged pipe, casing and thick-wall tube can pass through the headstock and be supported at the back, and the optional rear chuck arrangements found on bigger machines become less necessary. With the smaller one, the lathe keeps 2,000 rpm for ordinary shaft work.

Swing over the cross slide is 460 mm (18.1 in) and swing in the gap 940 mm (37.0 in). Even at this size the Alpha's manual mode is available, alongside the conversational Alpha System and full CNC on the Fanuc 0i-TF Plus touchscreen control. Steady rests, hydraulic chucking and a swarf conveyor are options. No C-axis or driven tools are fitted to the XS.