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On an independent-jaw chuck, each jaw can be moved independently. Because they most often have four jaws, the term four-jaw chuck without other qualification is understood by machinists to mean a chuck with four independent jaws. The independence of the jaws makes these chucks ideal for (a) gripping non-circular cross sections and (b) gripping ...
Comparison with different types of chucks - Collet Scroll chuck Independent-jaw chuck; 1. Fast chucking (unclamp one part, switch to a new part, reclamp) Reliably Reliably Generally not 2. Self centering Reliably Reliably Never 3. Strong clamping Reliably [4] Usually Reliably 4. Resistance against being jarred loose (untightened) Reliably [4]
On these chucks the runout faces limitations; on late-model CNCs, it can be quite low if all conditions are excellent, but traditionally it is usually at least .001-.003 in (0.025-0.075 mm). The four-jaw chuck is used either to hold irregular shapes or to hold round or hex to extremely low runout (with time spent indicating and clamping each ...
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Its first product was a two-jaw drill chuck. In 1910 the first patent – improved drill chucks – was filed. Export business started the same year. Due to the influences of World War I production came to a standstill and resumption turned out to be difficult after the end of the war. In 1926, RÖHM started the production of key-type drill chucks.
The cutting edges of the drill bit contact the workpiece, and are connected via the shaft with the shank, which fits into the chuck. In many cases a general-purpose arrangement is used, such as a bit with cylindrical shaft and shank in a three-jaw chuck which grips a cylindrical shank tightly.