Understanding the parts of a toolholder:

When working with CNC Machines it is important to understand the parts of a toolholder and what they do in order to maximize manufacturing and efficiency. There are four parts to a toolholder:

Pull Studs: The job of a pull stud is to hold the toolholder in the spindle. Should the pull stud wear down, it can create a dangerous environment by flying out of the spindle during use.

Taper: The top of the taper holds the pull stud and is shaped like a cone. When changing a tool the taper enters the spindle.

V-Flange: The v-flange is recognized by the “V” engraved on the outside of the tool holder and is clamped onto the automatic tool changer when the tool is rotated from the tool changer to the spindle and back.

Collet Pocket, Collet and Nut: The collet enters the collet pocket which is fastened by the collet nut.

Why is it necessary to replace toolholders?

It is necessary to replace toolholders because when they become worn down through use they can damage the spindle which may become costly and cause cutting tool failure.

Why has my cutting quality been reduced?

Your spindle may be bellmouthing which will decrease cutting accuracy and quality. The spindle should be reviewed by the operator and replaced or repaired. The taper should also be checked for any damages. If the taper seems damaged, the machine use should be discontinued until it is replaced.

Collet maintenance:

Collets need to be replaced more often than toolholders because of the softer metal they are made from. It is imperative to replace these parts when they become worn because they can cause premature cutting tool failure which will become expensive. Checking the outside of the collet for markings or damage and replacing them when scoring is evident will maintain the cutting tool and toolholder.

 

Sources:

http://www.machiningefficiencies.com/abouttoolfailure.html

http://www.techniksusa.com/downloads/Holder_Maintenance_2015_web.pdf