Grinding apparatus using fluid servomotor

A grinding apparatus comprising a grinding wheel attached to an output shaft of a fluid servomotor driven by fluid from a fluid source and controlled through a servo valve, wherein

• a housing of the servomotor is mounted on a stage moveable toward the work to be ground to press the grinding wheel against the work;
• the output shaft of the servomotor extends through a cover attached to an output side of the fluid motor along a center line of the cover;
• a rotation detector is provided comprising a rotating member mounted on the output shaft inside the cover and a rotation detecting member attached inside the cover facing the rotating member;
• any difference between the rotational speed of the output shaft detected by the detector and a target rotational speed is determined by a control device;
• the stage is moved in response to a control signal output from the control device, and
• in order to prevent wear of the grinding wheel attached to the output shaft, the target rotation speed is set at the high speed range and grinding is performed with decreased pressing force of the grinding wheel against the work to be ground.

A grinding apparatus comprising a grinding wheel attached to an output shaft of a fluid servomotor driven by fluid from a fluid source and controlled through a servo valve, wherein

• a housing of the servomotor is mounted on a stage moveable toward the work to be ground to press the grinding wheel against the work;
• the output shaft of the servomotor extends through a cover attached to an output side of the fluid motor along a center line of the cover;
• a rotation detector is provided comprising a rotating member attached to the output shaft inside the cover and a rotation detecting member attached inside the cover facing the rotating member;
• any difference between the rotational speed of the output shaft detected by the rotation detector and a target rotational speed is determined by a control device;
• the stage is moved in response to a control signal output from the control device, and
• the rotating member attached to the output shaft inside the cover is a rotor of a tachogenerator and the rotation speed detecting member attached inside the cover is a magnetic body of the tachogenerator.

A grinding apparatus comprising a grinding wheel attached to an output shaft of a fluid servomotor driven by fluid from a fluid source and controlled through a servo valve, wherein

• a housing of the servomotor is mounted on a stage moveable toward the work to be ground to press the grinding wheel against the work;
• the output shaft of the servomotor extends through a cover attached to an output side of the fluid motor along a center line of the cover;
• a rotation detector is provided comprising a rotating member attached to the output shaft inside the cover and a rotation detecting member attached inside the cover facing the rotating member;
• any difference between the rotational speed of the output shaft detected by the detector and a target rotational speed is determined by a control device;
• the stage is moved in response to a control signal output from the control device, and
• the rotating member attached to the output shaft inside the cover is a disk plate of an optical rotary encoder and the rotation speed detecting member attached inside the cover is a photointerrupter of the optical rotary encoder.

A grinding apparatus comprising a grinding wheel attached to an output shaft of a fluid servomotor driven by fluid from a fluid source and controlled through a servo valve, wherein

• a housing of the servomotor is mounted on a stage moveable toward the work to be ground to press the grinding wheel against the work;
• the output shaft of the servomotor extends through a cover attached to an output side of the fluid motor along a center line of the cover;
• a rotation detector is provided comprising a rotating member attached to the output shaft inside the cover and a rotation detecting member attached inside the cover facing the rotating member;
• any difference between the rotational speed of the output shaft detected by the detector and a target rotational speed is determined by a control device;
• the stage is moved in response to a control signal output from the control device, and
• the rotating member attached to the output shaft inside the cover member is a magnetic ring of a magnetic rotary encoder and the rotation speed detecting member attached inside the cover is a hall IC of the magnetic rotary encoder.