3 Jaw Chucks

Rayco Fixtures supplies a wide range of fixture clamping and holding systems to meet the needs of machine shops and manufacturers. There are times when a 3 jaw chuck is preferred over a collet or 4 jaw chuck, especially when you’re running a variety of different jobs that feature different workpiece diameters.

What is a 3 Jaw Chuck?

A 3 jaw chuck is essential for metal, wood, or plastic turning operations. This holding tool is mounted on a lathe spindle as a clamping device to securely hold the workpiece. The result is a secure clamping force that allows for difficult to machine materials to be turned and cut more accurately, and more safely,

A 3 jaw chuck is a popular fixture used in CNC mill, lathe, and drill press operations. This chuck is the best solution to grip round or hexagonal workpiece that requires accurate and fast centering, and for handling irregular workpieces.

Selecting a 3 Jaw Chuck

Rayco offers a wide range of 3 jaw chuck sizes and weights that are appropriate for heavier work or different spindle threading. The first consideration for choosing a 3 jaw chuck is making sure the workpiece configuration is a good fit – round or hexagonal pieces without a thin wall.

The next consideration is making sure your lathe or other industrial machines can manage the high speeds and powerful clamp forces need for large, through-hole operations, for example. In these operations, the larger and heavier 3 jaw chuck would be preferred.

Rayco offers 3 jaw chucks with various specifications including:

  • 1/4-20 threading, 4 pounds and measures 7 inches wide, 5 inches tall.
  • M6 thread type and weighs either 3.25 or 4 pounds, 127 millimeters tall and 177.8 millimeters in width.
  • M4 or M6 thread type, 3.25 pounds a product with 101.6 millimeters by 69.27-millimeter design.
  • M8 thread chuck measures 127 millimeters by 177.8 millimeters.

The benefit of 3 Jaw Chuck

While you may get more gripping power with a 4 jaw chuck, they are more expensive and are typically only necessary to grip square or rectangular workpieces. And, consider the following ways a 3 jaw chuck overcomes this issue.

First off, the 120 degrees spacing of the jaws in a 3 jaw chuck is a very powerful configuration and can actually provide a stronger grip on some workpieces when compared to the 90 degrees spacing in a 4 jaw chuck. The asymmetrical spacing and power dispersed with a 3 jaw chuck configuration can be stronger when compared to the symmetrical position of jaws that are across from each other in a 4 jaw chuck.

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