Studer S141

The Studer S141 is a CNC cylindrical grinding machine offered in three sizes, for workpieces 300 mm (11.8 inch), 700 mm (27.5 inch) or 1,300 mm (51.2 inch) long. All three take parts up to 400 mm (15.7 inch) in diameter and 250 kg (550 lbs) on a 200 mm (7.9 inch) center height, with spindle speeds up to 120,000 rpm and up to 18 kW (24 hp).

Look at the Z travel beside the workpiece length. The three sizes have 500 mm (19.7 inch), 500 mm (19.7 inch) and 700 mm (27.5 inch) of Z, so on the largest machine the slide covers only about half of a 1,300 mm part. That is the geometry of a machine that grinds bores and faces at the end of a long component, such as a spindle shaft or a long housing, and not of one that traverses a wheel along the whole length. If the feature sits deep inside the part, compare the reach of the spindle with the drawing. The table gives travel, not reach.

Cross travel is 425 mm (16.7 inch) and the B axis has a swiveling range of 330°, which together give room to bring more than one spindle to the part in turn. Both linear axes move at up to 20,000 mm/min (787 inch/min). The wheel limit of 300 mm (12 inch) in diameter and 32 mm (1.3 inch) in width applies to the largest wheel the machine accepts, while the 120,000 rpm figure is for small internal wheels.

The S151 is the next step up, with 500 mm (19.7 inch) of X travel and the same 18 kW (24 hp) and 120,000 rpm. Going the other way, the S121 has 350 mm (13.8 inch) of travel in both X and Z.