Used grinding machines - cylindrical centerless grinders 131


Supertec G20P-45CII Cylindrical centreless grinding machine

Year:

Max. length of workpiece 500 mm
Type of CNC
Grinding wheel width 25 mm
Max. weight between centers 80 kg
Grinding wheel diameter 305 mm
Grinding wheel bore 76.2 mm

Used TRIPET MUR 100 Cylindrical centreless grinding machine

Year: 1991

Max. length of workpiece 75 mm
Centre height 60 mm
Type of CNC
Max. weight between centers 125 kg
CNC No
Grinding wheel diameter 75 mm

TOS BU 28/630 Cylindrical centreless grinding machine

Year: 1985

Max. length of workpiece 630 mm
Type of CNC
Grinding wheel width 400 mm
Max. weight between centers 65 kg
Grinding wheel diameter 295 mm


Kellenberger UR-H 305 x 1000 Cylindrical centreless grinding machine

Year:

Max. length of workpiece 1000 mm
Centre height 225 mm
Type of CNC KELCO 90
Max. weight between centers 200 kg
CNC Yes
Grinding wheel diameter 500 mm

CINCINNATI 3-300 TWIN GRIP Cylindrical centreless grinding machine

Year:

CNC No
Grinding wheel diameter 610 mm
Type of CNC
Grinding wheel width 355 mm

TOS BHU 32A/1000 Cylindrical centreless grinding machine

Year: 1982

Max. length of workpiece 1000 mm
CNC No
Grinding wheel diameter 320 mm
Max. weight between centers 300 kg
Type of CNC

TOS BUC 63 A Cylindrical centreless grinding machine

Year:

Max. length of workpiece 4000 mm
CNC No
Grinding wheel diameter 750 mm
Max. weight between centers 2500 kg
Type of CNC -
Grinding wheel width 100 mm

Cylindrical Grinding Machine TOS BH 25A-1500

Year: 1983

Max. length of workpiece 1500 mm
Grinding wheel diameter 250 mm
Type of CNC

Bocca Malandrone R 50 CF Cylindrical centreless grinding machine

Year: 2003

CNC Yes
Grinding wheel diameter 508 mm
Type of CNC FANUC
Grinding wheel width 254 mm

Estarta 301 Cylindrical centreless grinding machine

Year: 1975

Max. length of workpiece 125 mm
Type of CNC
Grinding wheel width 125 mm
CNC Yes
Grinding wheel diameter 300 mm
Grinding wheel bore 175 mm

Landis 500 SE - CNC Cylindrical centreless grinding machine

Year: 2002

CNC Yes
Grinding wheel diameter 508 mm
Type of CNC Landis System 6400
Grinding wheel width 500 mm

Danobat Estarta 301 cylindrical centreless grinding machine

Year:

CNC Yes
Grinding wheel width 125 mm
Grinding wheel diameter 300 mm

Tschudin GL 600 Cylindrical centreless grinding machine

Year:

Type of CNC
Grinding wheel width 350 mm
Grinding wheel diameter 600 mm
Grinding wheel speed 290 rpm

Tschudin GL 600 Cylindrical centreless grinding machine

Year:

Type of CNC
Grinding wheel width 350 mm
Grinding wheel diameter 600 mm
Grinding wheel speed 290 rpm

TOS BUB 32/1000 Cylindrical centreless grinding machine

Year: 1988

Max. length of workpiece 1000 mm
Type of CNC
Max. weight between centers 350 kg
Grinding wheel diameter 320 mm

Kellenberger 1000U BEMA Cylindrical centreless grinding machine

Year: 2012

Max. length of workpiece 1000 mm
Centre height 225 mm
Type of CNC
Max. weight between centers 130 kg
CNC No
Grinding wheel diameter 400 mm

Estarta 327 CNC Cylindrical centreless grinding machine

Year: 1999

CNC Yes
Grinding wheel diameter 650 mm
Type of CNC SIEMENS
Grinding wheel bore 500 mm

TOS BHU 32A/1000 Cylindrical centreless grinding machine

Year: 1982

Max. length of workpiece 1000 mm
Type of CNC
Max. weight between centers 320 kg


Cylindrical grinding machines or cylindrical grinders are used for shaping metal, specifically the outside of metal objects.

Evolution of cylindrical grinders

In terms of innovations, cylindrical grinding machines have overcome almost an identical process to the rest of metalworking machines. The first big milestone correlates to numerical control creation in the 1940s. Back at the time, U.S. Air Force was pushing towards developing a more efficient and less costly way of producing metal parts for airplanes. This fact played a significant role in NC system development. Numerical control was a huge break through, however, decades later Computer Numerical Control was introduced in cylindrical grinders. Wave of computerization hit the world during the 1970s and 1980s which allowed to revolutionize cylindrical grinders capacity.

The way cylindrical grinders were able to function thanks to inbuilt computers was completely innovative. Cylindrical grinding machine would receive a command from the CNC system which determined the dimensions of the final metal part and the production process. CNC added a new dimension to cylindrical grinding since the measurements were more precise now. An operator was now needed only to control the process but not to perform any manual actions nor direct the machine. Cylindrical grinding process now required very little human intervention.

Cylindrical centerless grinders

Inside of the centerless grinder is positioned a regulation wheel which is situated on the opposite side of the metal object itself. Unlike in a standard cylindrical grinder, nothing holds the workpiece/object in its place. A work rest keeps the object at the appropriate height but has no bearing on its rotary speed. The workblade is angled slightly towards the regulating wheel, with the workpiece centerline above the centerlines of the regulating and grinding wheel; this means that high spots do not tend to generate corresponding opposite low spots, and hence the roundness of parts can be improved. Centerless grinding is much easier to combine with automatic loading procedures than centered grinding; throughfeed grinding, where the regulating wheel is held at a slight angle to the part so that there is a force feeding the part through the grinder, is particularly efficient.

Centerless grinding process

In centerless grinding, the workpiece is held between two wheels, rotating in the same direction at different speeds, and a workholding platform. One wheel, known as the grinding wheel (stationary wheel in the diagram), is on a fixed axis and rotates such that the force applied to the workpiece is directed downward, against the workholding platform. This wheel usually performs the grinding action by having a higher tangential speed than the workpiece at the point of contact. The other wheel, known as the regulating wheel (moving wheel in the diagram), is movable. This wheel is positioned to apply lateral pressure to the workpiece, and usually has either a very rough or rubber-bonded abrasive to trap the workpiece.

The speed of the two wheels relative to each other provides the grinding action and determines the rate at which material is removed from the workpiece. During operation the workpiece turns with the regulating wheel, with the same linear velocity at the point of contact and (ideally) no slipping. The grinding wheel turns faster, slipping past the surface of the workpiece at the point of contact and removing chips of material as it passes.

Area of use

Cylindrical centerless grinders are irreplaceable for any situation which requires metal work of the highest precision. Cylindrical grinding machines can assure exactly that, they are able to provide extremely high precision level, like no other metalworking machine. Hence, cylindrical centerless grinders are used across many industries, from automotive to military.

Main manufacturers

Diversity of cylindrical grinders manufacturers is truly impressive. Exapro online catalog contains dozens of offers, with the most popular manufacturers being Studer, Guilin, Heckert or Johansson. There are also other brand names with good reputation among cylindrical centerless grinders, such as Danobat or Monzesi.

Related subcategories

  • Grinding machines - cylindrical external / internal grinders
  • Grinding machines - surface grinders