3.1" 3-Jaw Self-centering Chuck
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3.1" 3-Jaw Self-centering Chuck Overview
Self-centering chucks utilize a spiral scroll that causes all three jaws to close on the part at the same time when the outer ring of the chuck is turned in relation to the body. Round or hex material is centered quickly and easily. Runout (centering accuracy) is guaranteed to be .003" or less. Because of the number of moving parts, accuracy greater than this cannot be guaranteed with this type of chuck. If greater centering accuracy is needed, an "independent" jaw chuck where the jaws are adjusted one at a time might be needed. Self-centering chucks are the most popular because they offer quick centering and a high enough level of accuracy for most jobs. Reversable jaws are made from hardened steel. This large chuck will hold parts from 3/32" up to 1/1/2" with the jaws in the normal position. Reversing the jaws allows parts up to 2-3/4" to be held. Two steel spindle bars (sometimes called "Tommy" bars are included to tighten the chuck. For use with Sherline machine tools.
3.1" 3-Jaw Self-centering Chuck Feature
- Hardened steel reversible jaws
- Hold parts from 3/32 to 1-1/2 in regular position, to 2-3/4 with jaws reversed
- Jaws scroll together when outer ring of chuck is turned for quick centering of material
- ¾-16 thread fits Sherline spindles
- Includes two spindle bars for adjustment
