SCHUNK has developed new features to its TENDO range of hydraulic toolholders, which allow them to directly clamp different types of cutting tools with cylindrical shanks, without using intermediate sleeves.
SCHUNK says the TENDO hydraulic toolholders use a steel sleeve surrounded by hydraulic fluid to perform the clamping. An internal piston forces the hydraulic fluid into a cavity surrounding the steel sleeve, while the high pressure uniformly forces the sleeve around any cutting tool shank.
According to SCHUNK, cutting tools with different shanks can be held with a concentricity of less than 0.003 mm. Torque transmission capacity has also been increased by up to 15%.
SCHUNK says the enormous clamping pressure displaces oil or grease into the TENDO groove in the clamping bore. Clamping areas remain dry and high torque transmission is guaranteed at all spindle speeds.
According to SCHUNK, the hydraulic system also absorbs vibrations inherent in the cutting or grinding processes. As a result, the TENDO hydraulic toolholders have repeatability of less than three microns and up to four times the tool life of other units.