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STUDER S 20-12 is a cylindrical grinder engineered for precision, high accuracy and reliable performance. Capacities: centre height 100 mm, distance between centres 400 mm; wheel Ø300×30 mm, bore 127 mm; work-spindle 20°, table tilt 30°. Specs: work-spindle speeds 60–1200 rpm (stepless); wheel speed up to 45,000 rpm; table feed 100–3500 mm/min; wheel motor 4.5 CV; 3×380 V; weight ≈1900 kg; dims 1500×1400×1600 mm. Key accessories: swivelling internal grinding unit, dressing devices, 120 mm magnetic chuck. Achieves tight tolerances; typical sectors: automotive, aerospace, toolmaking, medical, watchmaking
| Centre height | 100 mm |
| Distance between centres | 400 mm |
| Grinding wheel: | |
| Diameter | 300 mm |
| Width | 30 mm |
| Bore | 127 mm |
| Angular displacement | 30 ° |
| Work piece spindle head: | |
| speeds: | |
| stepless | |
| from | 60 t/min |
| up to | 1200 t/min |
| rotatable | 20 ° |
| Inner taper type | W20 |
| Spindle taper | 4 CM |
| Taper in tailstock: | 2 CM |
| Table angular displacement | 30 ° |
| Table speed: | |
| stepless | |
| from | m/min |
| from | 100 mm/min |
| up to | 3500 mm/min |
| Voltage 50 Hz 3x | 380 Volt |
| External Grinding wheel motor | 4.5 CV |
| Machine's weight about | 1900 kg |
| Overall dimensions machine: | |
| Length | 1500 mm |
| Width | 1400 mm |
| Height | 1600 mm |
| Various accessories: | |
| Internal grinding attachment swivellable: | |
| Spindle speeds | 45000 t/min |
| Reversible dressing device | |
| Laterally pivotable dressing device | |
| Macnetic chuck diameter | 120 mm |
| Grinding wheel with flange | |
| Set of flanges for internal grinding | |
| Steady | |
| Three-jaw bezel folds open | |
| Set of collets | |
| Balancing support | |
| Set of centers | |
| Set of driving dogs | |
| Tailstock with fine adjustement | |
| Grinding wheel guard | |
| Safety device |
