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WEMA SI solves sim­ple and com­plex inter­nal grind­ing tasks quickly and effi­ciently. A repeat­edly allo­ca­ble tool and a work­piece head­stock are guided on up to six axes with an accu­racy of 0.1 μm. As with all our machines, SI is scal­able and is adapted to your needs through a spe­cific mount­ing for the great­est machin­ing efficiency.

Since time is always impor­tant, we rely on our opti­mised pro­ce­dures: Our pow­er­ful dri­ves ensure a quick avail­abil­ity with addi­tional work and periph­eral mod­ules reduc­ing costly non-pro­duc­tive times. You stand to ben­e­fit from this through reduced cycle times, greater through­put and more sat­is­fied cus­tomers. We can also arrange financ­ing accord­ing to your frame­work conditions.

Key Facts

  • Machin­ing of chuck and shaft-shaped parts (steady-rest guided)
  • Inter­nal cylinder/​ cone, inter­nal poly­gons, inter­nal screw threads and more
  • Up to 4 applic­a­ble inter­nal grind­ing tools (fixed on B2 axis)
  • High rigid­ity through the use of cast beds / Hydropol beds
  • includ­ing intu­itive WOP-TouchTM user interface

For #cylin­der #taper #poly­gon #thread #eccen­tric #grooves

Our WOTAN® S3I is also suit­able for smaller and lighter com­po­nents. For even more machin­ing pos­si­bil­i­ties we offer the uni­ver­sal cylin­dri­cal grind­ing machine WOTAN® S6U.


Inter­nal cylin­dri­cal grind­ing ­machine for pro­cess­ing very heavy com­po­nents or par­tic­u­larly deep inter­nal diam­e­ters with the high­est pos­si­ble degree of precision.


Inter­nal cylin­dri­cal grind­ing machines of the WOTAN® S6I series are designed for pro­cess­ing medium-sized and large work­pieces. The work­piece spin­dle can absorb loads of up to 1 200 kg.

for com­po­nents clamped on one side only

for com­po­nent length of up to approx. 1 200mm | 1 800mm

max. Umlaufdurchmesser

820 mm

650/820 mm


800 mm

800 / 1,200 / 1,800 mm


650 kg

650/1,300 kg


620 mm

620 mm


650 mm

1,200 mm

Axis speed

0–15,000 mm/​min

Tool round table

Direct drive/​ Worm drive with 0.00005°
With up to 4 tool posi­tions and a tailstock

Work­piece man­drel drive

With­out a mea­sur­ing sys­tem or with a mea­sur­ing sys­tem as C axis, Belt drive or direct drive


  • Revolver head­stock with up to 4 inter­nal grind­ing mandrels
  • Optional exter­nal machin­ing and fac­ing operations
  • Work­piece head­stock with B axis
  • Hydro­sta­tic work­piece mandrel
  • Cen­tre-zero feeler
  • Fixed and/​or pow­ered dress­ing tools
  • Tool change system
  • Pre‑, in- and post-pro­cess­ing mea­sur­ing systems