
In metalworking, fixturing is the term used to describe holding a part in a fixed position to allow precise fabrication within a specified tolerance. Clamping consists of two basic elements:
- An actual clamping tool, such as a vise, used to hold a component in place.
- Positioning and permanently fixing a clamping tool to a machine. This can include the use of clamping plates, T-tables, 4- or 5-axis components and many other devices that can permanently position the part.

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Having a clamping system increases productivity and efficiency, which generates higher productivity and significantly reduces set-up and changeover times. In addition, it allows the operator to make quick changes to the job, ultimately increasing production efficiency. And changing parts in a highly repeatable manner significantly increases the quality of the finished part. All this is achieved without interrupting production. Often too much time is spent assembling a single component in a machine. A key function in streamlining production is to develop a fixturing solution that optimises the machining of multiple parts simultaneously while maintaining tight tolerances.
Types of CNC tool holders
The tool holder is the machining component that usually holds the cutter in place. Its purpose is to hold the tool in place as accurately and firmly as possible, as a barely perceptible increase in runout can ruin a project or break a cutting tool.
Different types of toolholders have different levels of runout and balance. Their service life and durability also vary. Another important factor to consider when choosing a CNC toolholder is the time it takes to change cutters, as this has a direct impact on profit and production output.
Types
Tool holders vary based on the method used to hold end mills in place. Here is a basic overview of the types of tool holders for CNC milling:
- Shrink Fit Handles: This type of holder uses heating and cooling to apply clamping force to the cutting tool. Shrink-fit holders provide a firm grip and can significantly extend tool life.
- Sleeve holders: The collet mounts the cutter with a slotted collar. Standard collets are dimensioned to the millimeter, but can also be customized to meet customer needs.
- Weldon milling chucks: This type of milling toolholder uses a side screw to secure the cutting tool. They have different clamping diameters and are available in different lengths.
- Handles for threading dies: This category includes rigid tapping holders, floating holders and quick-change insert tapping machines.