Mill Chuck Guide

What is a mill chuck?

A mill chuck, also known as a milling chuck, is one type of toolholders that is used to hold a cutting tool to proceed milling works. The milling work would contact with the workpieces closely, in order to make the desired shapes of the workpieces. This process requires the assistance of the toolholder to ensure the optimal stability to avoid deformation of the products. After all, any deformation can be the profit killer for the manufacturer. Therefore, you will definitely need a mill chuck when you are conducting the milling work.

The straight shank of a mill chuck is like a cylinder, with one side ends with conical, and the other side ends with hollow through the inner part of the straight shank. On the end of the hollow side, there are a base in combination with a taper. Outside the taper, there is a thick nut that provides immerse gripping strength by collapsing the tight taper on the mill chuck body. Inside the taper, there is a staggered, coated steel cage that provides more gripping power and will never break.

Why do we use mill chucks rather than collet chucks?

Collet chucks look similar to mill chucks, which also have a cylinder, hollow shank with one conical end. Collet chucks are the most common than other types of chucks, since they are not very expensive and offer a variety of sizes to accommodate to different need. They are also used to hold the workpieces to do milling or drilling works and provide good run-out and gripping force. So, what’s the difference between chucks and mill chucks?

Although collet chucks can be applied to various kinds of machining works, there is still limitation of them. With the widespread application of precision finishing, high-speed milling becomes more and more common. While some of the small-size collet chucks cannot provide all the high-speed milling works appropriate gripping force, which may cause chatter or deformation of the products made by the workpieces.

Chatter is caused by the vibration of the cutting tool, which makes the irregularity of the surface of the workpieces and further makes poor quality of the products. Chatter would not only badly affect the quality of the products, but also reduce the durability of the tools. The key reason can be found by looking back to the toolholders. In order the prevent this situation from happening, the manufacturer would prefer using mill chucks, since the sizes of mill chucks are larger than collet chucks, which provide more gripping force and prevent the vibration caused by instability from happening and further occurs chatter.

Features of a mill chuck

● multi-roller system
The coated cage around the taper of the mill chuck provides 140% more needle rollers than older models, which are arranged in perfect order with dense production and are less possible to scatter comparing to the low-density ones. Therefore, the multi-roller system ensures the firmness of the mill chucks.

● internal slots
The internal slots of the thick walls inside the taper of the mill chuck provides more friction and strong chucking torque of the contact surface, which prevents distortion without vibration even at heavy milling.

● rigidity
The thick walls inside the taper of the mill chuck offers maximum rigidity to hold the cutting tool without easily breaking down.

● stability
The stopper located in the mill chuck exert the maximum chucking torque to the mill chuck, with tightening the chuck that is close to the flange faces, it provides the highest level of stability when the milling work is processing.

● run-out accuracy
The flange and taper grinding of the mill chuck allows the smooth and precise chucking of the tools, which attains the run-out accuracy within minimal T.I.R.

How does a mill chuck work?

To let a mill chuck work, the first thing is to insert the cutting tool into the mill chuck. This process is finished by tightening the nut so as to make the cutting tool in contact with the holder body. Next, set the workpiece under the mill chuck in the desired position, since the mill chuck is worked from above the workpiece. Then, the mill chuck would rotate in a high speed after it is operating. Along with the rotating of the mill chuck, the cutting tool would make force onto the workpiece to mill the desired shape. Since there would be heats made from the rapid contact between two surfaces, the mill chuck is equipped with coolant system, which cool the workpiece during the process of milling and prevent burning. Thanks to the combination of the features in the mill chuck, even with the high-speed operation of the milling work, chatter is avoided and the durability of the mill chuck is also ensured.

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