Universal Grinding Machine

UBB 50 – 500 kg

Universal Grinding Machine

UBB 50 – 500 kg

Distance between centers 1,000; 1,500; 2,000; 3,000 mm
Max. swing diameter 250 mm
Rotation of the grinding headstock -30/+210 º
Minimum programmable increment of rotation of the grinding head 0,001 º
Minimum X axis increment 0.001 mm
Minimum Z axis increment 0.005 (0.001) mm
Grinding wheel peripheral velocity 25 – 45 m/s
Max. weight between centers 500 (600) kg
Max. workpiece weight incl. fixture – overhanging 100 kg
Grinding wheel diameter 500 (600) mm
Spindle power 11 (15) kW
CNC control system Siemens Sinumerik 840D sL 

Download the product booklet


The Universal grinding machine UBB 50 CNC is based on the all-purpose cylindrical grinder UB 50 CNC. It is a cylindrical grinder for workpieces of maximum diameter of 500  mm and maximum length of 3,000  mm, with an additional B-axis.

The B-axis enables the use of up to three grinding wheels making it possible to grind a workpiece completely while clamping it only once, with minimum additional time and maximum precision using internal grinding.

  • Flexible grinding of medium-heavy to heavy cylinders and shafts.
  • Manual or automatic grinding.
  • Heavy machine design with variable grinding wheel location.
  • Optional size of the grinding wheel, its storage and location.
  • Control system CNC – Siemens 840 Sinumerik D sL.
  • Grinding spindles with hydro-dynamic suspension or on roller bearings.
  • Internal and external grinding.
  • Partial or full cover of machine with grinding mist exhaustion.
  • SBS Dynamic balancing system of grinding wheel.
  • Measuring, cooling and electric systems by world leading manufacturers.
  • Flexible adjustment of additional components.

Photo gallery

Standard accessories

  • Coolant splash guards – partially covering with a manual-controlled door.
  • Tailstock mounted wheel dresser (without diamond).
  • Fixed tips (2pcs).
  • Sedimentation cooling equipment.
  • Electric foot pedal for pneumatic tailstock control.
  • Puller of grinding wheel flange.
  • Suspension of grinding wheel flange.
  • Set of pads for bed leveling.
  • Balancing arbor with a nut.
  • Tools for operating of machine
  • LED lighting IP65.
  • Technical documentation.

Special accessories

  • Size gauge for longitudinal workpiece positioning.
  • In-process measurement of workpiece diameter.
  • SBS Automatic electro-dynamic balance system of the grinding wheel.
  • Extra grinding wheel flange.
  • Closed steady rest actuated by hand.
  • Tilting wheel dresser table mounted w/o diamond actuated by hand.
  • Three-jaw chuck, incl. adapter plate.
  • Permanent magnetic plate, incl. adapter plate.
  • Auxiliary rests with different diameter range.
  • Side and angular dresser table mounted w/o diamond actuated by hand.
  • Radius dresser table mounted w/o diamond actuated by hand.
  • Att. for fine table swiveling with dial indicator.
  • Water tank fitted with a magnetic or belt filter or a combination thereof.
  • Wheel balancing stand.
  • Unique system SmarTOS

Do not hesitate to contact us

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TOS Hostivař s.r.o.

Rádiová 1431/2a
102 00 Praha 10
Czech republic