Angle Head Holder

Tool Holder Overview

There are many types of tool holders available for industrial application, such as an angle head holder. A tool holder is basically a machining component that holds the end mill in place. The primary function of a tool holder is to hold the desired tools in place as securely and precisely as possible. A poorly chosen tool holder can very likely sabotage your project and damage your cutting tools

Different types of tool holders, including the angle head holders, have distinct levels of balance and runout. Different tool holders also have varying durability and tool life. Generally speaking, the major factor for choosing a tool holder is to consider how long it takes to change an end mill with it, as the tool is directly associated with the efficiency. In this article, we’ll specifically address a type of tool holder – the angle head holder.  

What is an Angle Head Holder

Angle head holders, often shortened to angle heads, combine horizontal and vertical operations on one machine. They are used to increase the productivity by adjusting the angle of the cutting tool easily while utilizing the existing work piece setup. With the adoption of angle heads, overall accuracy of the operation can be improved while eliminating any potential errors produced by multiple setups. 

Angle heads are typically designed to allow coolant (indicated in psi) from spindle variation through the machine tool spindle and out an adjustable port above the cutting tool. They are generally compactly designed for minimal overhand in order to add strength and rigidity to the cutting tool.

Angle head holders are mainly used for light cutting. Some of the key features of angle heads include: 

● Angle heads mainly used for drilling and tapping machining. You typically would not use these alongside heavy duty operations.

● Angle heads allow coolant to be fed through a dowel pin or machine spindle into the body, a coolant nozzle or a coolant outlet from the cutting tools with coolant holes. The coolant is typically expressed in psi. 

● Angle head holders are generally recommended for light cutting, ideal for a cutting depth of equal or less than 2 mm.

● Angle head holders are generally compatible with ATC automatic tool change systems.

● The direction of rotation of angle heads is typically the opposite to the machine spindle. 

● Angle head holders are generally capable of achieving a maximum revolution of 15,000 rpm and maximum torque of 150 Nm, while retaining a gear ratio of 1:1. 

● Angle heads can be rotated a full turn by 360 degrees and is infinitely variable.

● Angle head can be rotated through 360° and is infinitely variable – additional 6 x 15° indexations for adjustable angle units

Construction of an Angle Head Holder

We’ve outlined the core components and elements of an angle head holder below:

Spindle Bearing: Angle heads are equipped with high precision spindle bearing that are suitable for high speed. Quality bearing lubrication is typically used as well.

Stabilized Spindle Bearing: It is the interior tool hold spindle, also known as the point of load incidence within the house with low leverage. 

Permanent Lubrication: The gears of angle heads are normally applied with heavy duty lubricant. Other than this, additional maintenance is generally not required.

Stop Blocks: Angle heads are sometimes paired with different standard stop blocks. They are often chosen and fitted to the machine tool by buyers. 


When to Use an Angle Head Holder and What to Consider

The employment of angel head holders will allow a three-axis machine to be more versatile. But you may be wondering how to go about adding one of these useful components to your machine tools. Generally speaking, you have a few different ways to enhance the flexibility and efficiency of a three-axis machine tool, with the adoption of angle heads being one of the primary ways to allow angular drilling or milling without having to reposition the work piece for a secondary operation. 

To add an angle head to your existing machine, you’d have to take a few things into consideration. First and foremost, you’ll have to consider the possibility for a new postprocessor. Second of all, you have to make sure that you already have a programming scheme developed to accommodate tools of different length automatically that will be used in the angle heads. Lastly, you may have to consider ways to simplify the use of angle heads. For instance, on-machine probing is a common complementary capability to speed up the process.

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