Dead Center
The dead center is used to support stock which is too long to be supported by the chuck alone. Stock protruding more than 21⁄2 times its diameter should be supported by a dead or rolling center.
Figure 8. Dead center installed in tailstock.
The tailstock barrel and center have a Morse Taper #3. Before assembling these, insure that the mating surfaces are “white glove” clean. Clean the mating surfaces so they are free of dirt and oil. These parts will last longer and remain accurate when properly cleaned before assem- bly. Morse tapers will not interlock when dirt or oil are present on the mounting surfaces.
Insert the end of the center into the tailstock bore until it seats. The force of the center contacting a mounted workpiece will fully seat the taper when the handwheel is tightened.
When using a center, the tailstock barrel should protrude about 1⁄2'' and not more than 11⁄4'' out of the tailstock body. See Figure 8.
To remove the live center, back the tailstock bar- rel all the way into the tailstock casting by turning the handwheel, on the end of the tailstock, coun- terclockwise. The live center will pop out. Be sure to hold it before it comes out lest it drop on the lathe bed and damage the tip.
D
21⁄2 x D
Always use a center to support the end of any workpiece that protrudes out of the chuck further than 21⁄2 times its own diameter. A work- piece not supported this way could bend suddenly and cause
serious personal injury.
G4015 Lathe/Mill |
