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Chucks – Self-Centring
Chucks – Self-Centring
AS type chucks are generally used for 2nd operations and in toolrooms where higher accuracy is required. These chucks are adjustable up to 0.005 mm and repeating accuracy within 0.015 mm on the same dia. Adjusting procedure: hold the workpiece in this chuck in normal manner. Slacken the adjusting screws with dual purpose key provided. Place the dial indicator against workpiece and rotate the chuck till lowest reading is obtained. The adjusting screw nearest to low reading is then tightened until gauge needle moves half of the total concentricity reading. The same procedure is repeated till the desired level of concentricity is achieved. All adjusting screws then finally are checked for full tightness. No further adjustment is required for repetitive machining of similar jobs of the same dia, which is possible within 0.015 mm accuracy. Always use nominated pinion for repetitive gripping accuracy. Limitations: AS type chucks are slightly unbalanced due to adjustment feature and may cause spindle vibration at high speed.
