Climb Milling
Conventional milling is one of the most commonly used milling processes for material removal in woodworking. Different methods are applied depending on the workpiece, material, and position. While climb milling is often preferred for various reasons, conventional milling also has its firm place. The relationship between the feed direction and the rotational direction of the milling head plays a crucial role here.
In this article, you'll learn everything about conventional milling: What exactly is conventional milling? How does it differ from climb milling? We'll also explain the advantages and disadvantages, as well as the application area of conventional milling.
Table of Contents
- Definition
- Benefits
- Disadvantages
- Difference between climb milling and conventional milling
- When should you choose conventional milling over climb milling?
- Which is better: climb milling or conventional milling?
- When do you use conventional milling?
Definition: What is conventional milling?
Milling is a chip-forming manufacturing process where a rotating tool (the cutter) removes material. Conventional milling is a part of this process. The key difference is that the cutting edges of the milling head rotate opposite to the direction the workpiece is fed.
Benefits of conventional milling
Unlike climb milling, conventional milling usually comes with fewer risks. When you manually feed the cutter, you're guiding it against the material. This counter-rotation lowers the chance of your hand getting caught in the rotating tool. Conventional milling is also a good choice for older machines that have a lot of backlash in their feed mechanism. It works well for wood and also shows less wear when machining cast parts.
Disadvantages of conventional milling
Unlike climb milling, the results are often less clean. Higher pressure is exerted during the milling process, which can lead to faster wear of the cutting edges. Additionally, the milling cutter requires more power, which reduces efficiency.
What's the difference between climb milling and conventional milling?
In climb milling, the cutter edges rotate in the same direction as the feed, meaning the chip thickness is largest at the start and decreases towards the exit. In conventional milling, the cutter and feed move in opposite directions, so the chip thickness starts at zero and increases towards the exit. Chips (comma-shaped chips) form differently, which impacts heat, cut quality, and wear.
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When should you choose conventional milling over climb milling?
Conventional milling is especially suitable when the milling result doesn't need to be super clean – for example, for rough material removal. Often, you'll remove most of the material with conventional milling and then do the finish cut with climb milling. With manual feed, climb milling is sometimes prohibited or heavily regulated by professional associations. Also, if your clamping setup isn't ideal and you can't safely handle strong 'pulling forces' (like you get with climb milling), you'll probably choose conventional milling.
Which is better: climb milling or conventional milling?
Climb milling usually delivers cleaner results and avoids tear-outs. However, it carries higher risks. Conventional milling is generally safer, but the milled surface is rougher, and wear on the cutting edges can be greater. In many cases, it's advisable to rough cut with conventional milling and finish with climb milling.
When do you use conventional milling?
Conventional milling is primarily used for workpieces made of wood or those with hard and abrasive edge zones. It's often recommended because the risk of danger is lower compared to climb milling. If the final result needs to be particularly smooth, you can make several passes or later re-mill in climb mode to minimize tear-out.
