Why is CNC Power Chuck Better?

A CNC chuck is an automated work-holding device used on CNC machines like lathes and machining centers. It has a circular structure with radially arranged jaws, making it ideal for holding symmetrical workpieces. It can be programmed for faster work holding, providing great operational flexibility.

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What is a CNC Chuck?

A CNC chuck is a mechanical device that securely holds the workpiece in its position during the machining process.

Unlike a regular chuck, a CNC chuck offers automated control of jaws. Also, it allows for precise jaw movement because of the programmable actuators.

Since the movement is controlled automatically with a powering device, they are also called a power chuck.

CNC chucks generally have a rigid configuration and are made of aluminum, brass/bronze, cast iron, steel, stainless steel, etc.

Parts of a Standard CNC Chuck

Its actuator is housed inside the body of the chuck. Some of its main parts include the body, master jaw, wedge plunger, drawnut, plunger nut, etc.

Master Jaw

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A master jaw is made of toughened steel. They are attached to the wedge plunger.The jaws slide over the grooves present on the cross-sectional face of the chuck.

Wedge plunger

The wedge plunger converts its Z-axis movement into the X-axis movement of the master jaws. It transfers optimal holding force to the jaws.

Drawnut

The drawnut acts as the actuator and transmits the motion from the hydraulic or pneumatic fluid to the chuck mechanism.

Plunger Nut

The plunger nut forms a link that connects the draw nut to the wedge plunger.

ALRIGHT! Finally able to respond and hopefully I can clarify some of this. The chuck is absolutely the issue, during a setup about a year ago, the program re-called a tool to change its offset, but this was not properly updated to reflect the turret. Both the programmer and I missed it so it indexed straight into Jaw 2 and said jaw has been a bit weak ever since.

The smallest tolerance I have to hold on a diameter is +.0.0 -0.0004, which is about equivalent to an H6 tolerance in Metric GD&T. I need to keep concentricity between setups as mentioned above. Runout is nowhere near as tight as +-.0002, although I think it can be safely assumed that would be a nightmare on a hydraulic chuck, rather I need to keep it within +-.004 and the chuck, between ops can really push that, plus the chamfers look like garbage and no one wants that.

So I was tasked with shopping for a chuck, and thought the S-20 was the right way to go and so far I haven't found a straight forward product that best suits us. Our budget is not so tight that we can't afford a new one, but none of use think purchasing 30 new collets (about $9000) for a Quick Change from Royal or Hardinge is worth the investment. We would be better off spending that on modular tooling on the lathe. The standard S-20 chuck cannot be used with a solid stop for the chuck, but if you buy a dead length style, they can be, OR you can purchase a quick change chuck and then purchase the S-20 master collet for it. All of this requires spending extra money of course.

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