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1/4" Shank - 1" Cut Length
Sharp Tools 1/4" x 1" (25mm) Single Flute - 5 Pack
Sharp Tools 1/4" x 1" (25mm) Single Flute - 10 Pack
Sharp Tools 1/4" x 1" (25mm) Single Flute
1/4" Shank - 1/2" Cut Length
Shank and Cut Diameter 1/4" (6.35mm) Cut Length: 1/2" (13mm)

These have a single flute with a deep cavity to carry a lot of material out of the cut. It's like digging with a shovel that can hold much more dirt.


These end mills are designed mainly for plastic but will work with wood and it is surprisingly more quiet than the two flute end mills.

This end mill will create a flat bottom surface

Technical Specifications:

Cut Diameter: 1/4 inch (6.35mm)

Shank Diameter: 1/4 inch (6.35mm)

Cut Length: 1/2" (13mm) and 1" (25mm)

Overall Length: 2" (50mm)

Related Tutorials
Bill of Materials
Many of you have asked me to provide a list of materials and costs for the CNC Machine. Here, I will provide a list of the materials, costs and where they can be purchased. In the list, I will also include various alternatives for different types of applications. This may include types of cutting tools, types of motors for the axes, etc. I will keep this list alive and updated in the "stuff for sale" in lieu of a better place. Please write me with suggestions, and if you know of better prices and places to get these materials. This list is a work in progress, since I wanted to make it available immediately. Most prices are from memory, until I find my receipts somewhere in one of my packing boxes, so you may see numbers change, but it gives you a general idea.
greenBull cutting aluminum graphic poster Cutting Aluminum with the greenBull CNC and Onsrud End Mill
In this video, we are showing 2 examples of cutting aluminum. The first example will be dry cutting which is cutting in the absence of a coolant or cutting fluid.
Torque and Linear Motion Formula
Periodically, I get questions from users of the site regarding torque and how much is required to move certain masses and a recent user emailed me specifically and it gave me the happy motivation to add this page. :) These masses are things like the gantry, or the z-axis assembly with the router mounted moving on the y-axis, or the just the router mount and router within the z-axis assembly. The question is usually in the form of, can my ??? oz-in motors be used on your CNC machine.