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How to true a 3 jaw lathe chuck?

Views:2     Author:Site Editor     Publish Time: 2021-06-26      Origin:Site

How to true a 3 jaw lathe chuck?

Some work pieces, because of their size and shape, cannot be held and machined between lathe centers. Lather chucks are used extensively for holding work for machining operations. The most commonly used lathe chucks are the three jaw universal, four jaw independent, and the collects chuck.


What is 3 Jaw Chuck?


A chuck is a type of clamp used to hold an object in a specific position, widely used in the CNC machining factory, in drilling and milling, chucks hold the rotating tools, while in the turning process, various lathe chuck types are used for fixing the workpiece. Many chucks have jaws that are tightened up to hold the tool or part. Machinists understand the term three-jaw chuck” as a self-centering three-jaw chuck, which also refers to universal chuck, this type is best suited to grip round and hexagonal pieces when requiring very fast, reasonably accurate centering.


What is 4 Jaw Chuck?


A 4-jaw chuck is a great, almost essential, accessory for any serious lathe worker. While it lacks the self-centering convenience of the 3-jaw chuck, it has other capabilities. Grip rectangular and other non-cylindrical shapes for turning or facing. Form rectangular-shaped objects.Precisely center cylindrical stock to within the limits of the lathe's accuracy. Hold stock off-center for turning cams or drilling off-center holes.


What is collect chuck?


The collect chuck is the most accurate chuck and is used for high-precision work and small tools. Spring collects are available to hold round, square, or hexagon-shaped workpieces. An adaptor is filled into the taper of the headstock spindle, and a hollow drawbar having an internal thread is instead in the opposite end of the headstock spindle. As the handwheel and drawbar are revolved, it draws the collet into the tapered adaptor, causing the collet to tighten on the workpieces.


Difference Between 3 Jaw Chuck and 4 Jaw Chuck


The most commonly used lathe chuck including 3-jaw and 4-jaw. What’s the difference between the four jaw chuck and three-jaw chuck?


1.Construction and motion
Three jaw chuck refers to self-centering chuck, its jaws are interconnected via a scroll gear and move at the same time, while jaws on four-jaw chucks move independently and require operators to center the workpiece.
2. Uses
Three-jaw chuck is the best option for holding circular or hexagonal cross-sections, while 4 jaw chuck is primarily useful for gripping square or octagon blocks.
3. Setting time
Four jaw chucks often take longer to set up but can do more than a 3 jaw chuck.
4. Accuracy
3-jaw chuck with an accuracy level of around 0.010 and the accuracy level of 4-jaw chuck is between 0 and 0.001.
5. Number of holes
The three-jaw chuck has only one hole for the chuck wrench or key to tighten or release the gripping, but a four-jaw chuck has four holes for controlling each jaw, one at a time.
6. Depth of cut
In a four-jaw chuck, the produced depth of cut is higher than that in three-jaw chucks.
7. Workpiece weight
Heavier stock can be turned in 4 jaw chuck but can’t in three-jaw.
8. Gripping power
The gripping power of the four jaw chuck is larger than 3 jaws.
9. Function
Eccentric turning is possible when the part is fixed in 4 jaw chuck, which can’t be done in 3 jaw chuck.


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