Once this hydraulic chuck is centred, the runout will not vary, even if a cutting tool is changed repeatedly. Click image to enlargeBig Kaiser has expanded its Swiss lathe chuck lineup to include inch-size standard type chucks, as well as new F type and R type chucks.

Standard type hydraulic chucks with tool-side clamping are now available in inch sizes with the clamping range of ø1/8-in., 3/16-in. and ¼-in.

The new F Type’s single wrench enables easy cutting tool changes on the tool post. The easy-access rear clamping design is ideal for front tool post. Clamping from the opposite side of the cutting tool and optimum-length design improves overall ease of use. The F Type is available in a clamping range of ø3-10mm and coolant delivery is possible with an Rc(PT)1/8’-in. screw.

The new R Type eliminates interference at both the upper or lower tool post positions with a unique block design and tightening at an offset position in the tool side. The R Type is available in a clamping range of ø3-10mm and its oil hole drills can be used for coolant delivery when mounted on the upper section.

To minimize machine downtime and provide operator safety, these hydraulic chucks use a simple hex wrench that requires only two to three turns for both clamping and unclamping. Tightening is complete when the clamping screw hits the bottom; controlling tightening torque is not needed. Once a hydraulic chuck is centred, the runout will not vary, even if a cutting tool is changed repeatedly. Runout of fewer than three microns at four times diameter can be achieved. Hydraulic chucks have a standard pipe thread for coolant-through connection and are available for most Citizen and Star machines with 3/4'-in. or 22mm straight shank.


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