Innovated collet chuck

KORAN_c_i_Taiwan.qxd 18.4.2018 17:18 Page 13 T A I W A N b u s i n e s s l machining l machines and tools INOVATED COLLET CHUCK CNC lathes with larger spindle passages, e.g. of 42, 52 and 65 mm diameters, may have a problem with machining small parts of smaller diameters, especially when machining radial holes or radial milling by means of driven tools. The driving tool head does not allow drilling or milling closely at the chuck face. The parts have to be extracted from the chuck, which results in undesirable vibrations during machining (insufficient rigid clamping). The new solution eliminates this problem, as a result of two new parts in the chuck - a reduced bayonet and a reduced collet housing. Both parts allow the driven tools to get closer to the clamp face. The reduced collet housing has a clamping cone moved up to the front wall of the inner bore in the reduced bayonet. The clamping force thus extends to the face of the extended clamp and ensures perfect clamping of small diameter parts. The reduced bayonet has a 25 mm smaller diameter at the front to allow the chuck holder to move closer to the clamping axis (the axis of the part). Reduced clamps are produced for standard 18SE collars reducing them to 173E collars. The reduced clamps for the 173E collars are then reduced to the 163E collars. The new solution replaces the socalled nose collars that allow better access for the driven tools to the material, but the clamping force is concentrated under the cone of the collet in the clamp, while reducing significantly at the extended part of the clamp (i.e. in the nose). The rigidity of the clamping then fails to meet the requirement while transverse drilling, radial milling or cutting. Photo/Text: Petr Růžička inzerce www.technikaatrh.cz 13