This is the most common usage scenario. It refers to an end mill where the cutting edge (teeth) is straight, parallel to the tool axis, and the tool is cylindrical as a whole.

1. Core features:

Tooth shape: The cutting edge is straight and has no helix angle. This means that cutting is like a chisel "hitting" and cutting wood fibers, rather than "sliding" and "lifting" fibers like a spiral knife.

Chip removal method: Straight teeth have poor chip removal ability. Chips will accumulate in the chip container and then be thrown out by centrifugal force or blown out by cutting fluid/air gun.

Cutting force: The axial force (vertical force) generated during cutting is relatively small, but the radial force (lateral force) is large, which can easily cause vibration.

Processing effect: Due to the "breakage" of wood fibers, it is easy to cause edge chipping and fuzzing of the workpiece when processing certain woods (especially transverse sections or laminated boards), and the bottom surface smoothness is not as good as that of spiral milling cutters.

2. Advantages:

Simple manufacturing and low cost: it is one of the cheapest types of milling cutters on the market.

Easy to regrind: The blade is straight and can be repaired by using a grinding stone or specialized tool.

Suitable for specific processing:

Shallow groove opening and bottom cleaning: used to mill the bottom surface flat during the machining of the cavity.

Opening mortises and three in one screw connection holes: It is very economical and practical to process these slot holes with low requirements for side wall smoothness.

Non wooden materials: When processing materials such as acrylic and plastic, straight teeth are less prone to melting and sticking.

3. Disadvantages:

Poor chip removal: prone to chip accumulation, resulting in high heat generation and the possibility of burning wood.

Poor surface quality during processing: especially unsuitable for processing workpieces with high side wall requirements for smoothness.

Easy to vibrate: requires high rigidity for equipment and clamping.