Feeler FT-350AL(MC)

Big bore, long bed: the Feeler FT-350AL(MC) is the FT lathe for oilfield-style tube and long heavy shafts. Its spindle has an A2-11 nose with a 131 mm (5.2 in) through-hole, bar capacity is 115 mm (4.5 in), and the maximum turning length is 1,520 mm (59.8 in).

It shares its 12 in (305 mm) chuck size, 620 mm (24.4 in) turning diameter and X travel of 310+20 mm with the FT-350(MC). The differences are all along the spindle axis. Z travel grows to 1,630 mm (64.2 in). The larger spindle bearings that an A2-11 nose implies bring the speed down to 2,000 rpm.

That speed is right for the work. Pipe couplings, tool joints, large hydraulic cylinders and long rolls are turned at big diameters where 2,000 rpm is more than enough, and a 131 mm bore lets tube pass through the spindle so that only the end being threaded or profiled sticks out of the chuck. Feeler lists the A2-11 spindle as one of two options for the FT-350, alongside A2-8, and describes the spindles as sleeve-type.

The tailstock has an MT-5 taper. With a metre and a half between chuck and centre, also ask the maker about a steady rest, which the series page does not mention. The turret is BMT65-12, with the MC version adding driven tools. Feeler names an FEA-optimized base with reinforced Z-axis and tailstock guide supports for the FT-350. No power, torque or gearbox details are given, and they are decisive for threading large pipe.