Amana Tool 51454-Z CNC, SC Spiral O Single Flute, ZrN Coated Aluminum Cutting Bit.
Picture of an Amana Tool 51454-Z CNC, SC Spiral O Single Flute, ZrN Coated Aluminum Cutting Bit.

What is an O flute CNC bit and WHY would I want to use it?

     An O (not zero) flute CNC router bit is a bit that is specifically designed to enhance certain materials machinability. Ouch, what did that mean. Well, lets look at it this way. When you are cutting steel with your reciprocating saw do you use a wood blade? Sometimes… Wait no. Never. You use the blade that is best designed for mitigating the properties of what you are cutting.

In short, an O flute bit is best suited for cutting specific material such as acrylic, plastics and high grade aluminum.

If you are still with me, the next question is enevitably, why? Well, an O flute Bit plays on two major factors. The first is temperature mitigation and the second is vibration, which one could argue go hand in hand. By designing a bit that has less drastic cutting edges (look at the picture above and then think of your standard 2 flute doencut bit) the bit has the ability to produce less heat. A few reasons for that, but one worth mentioning is the reduced amount of waste extracting from the cut site. There is less “fray” and that reduces heat. The second part is the design of the initial cutting edge. It’s basically flat. That combined with the shape of the flute causes (see below) very low vibration.

Why do we want less heat?

I think this is an easy answer, but the bottom line is that you don’t want to melt your material. With wood you would possibly have burn marks, but with plastic it would literally melt. Causing warping, design flaws, structural integrity issues and more. Chip re-welding is also an issue, that is when material you are cutting out gets hot enough that it reattaches itself to the original material before the cut is complete.

A huge benefit of cutting with a O flute bit and why many people choose it.

Beyond the desire not to ruin your material, many people love O flutes because it causes a mirror finish. Think of making a coin and causing the flat areas to be a perfect shiny mirror.

Amana Tool 51454-Z CNC, SC Spiral O Single Flute Top View
This is a Spiral O Single Flute diagram that shows the profile of the "top view." D is for diameter.

What materials are O flute CNC router bits good for?

  • ALPOLIC® Copper Composite Material
  • Alucobond®
  • Aluminum
  • Aluminum 5052
  • Aluminum 6061
  • Aluminum Alloys (Al-Alloy)
  • Aluminum Composite Materials (ACM)
  • Aluminum Composite Panel (ACP)
  • Alupanel®
  • Brass
  • Copper
  • Dibond®
  • Durabond*
  • e-panel™
  • Etalbond®
  • Fomex® with Aluminum Face
  • Gold
  • Non-Ferrous Metals
  • Plastic
  • Silver
  • Solid Surface
  • Titanium Composite Material (TCM)
  • Wood
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Hope this was helpful! Please like and subscribe! If you have a question or something I can go further into please comment!

Check out my blog and website.

Have a great day and have fun with your work,


Hill Country CNC & Woodworking LLC

#cncmaker #makersofintsagram #amanatools #hobbylife #toolguy

Link to the bit I use Amana Tool 51454-Z CNC, SC Spiral O Single Flute. And you should know that I am an affiliate marketer for ToolsToday, BUT I love their tools. I didn’t choose to do this with them because it would bring me alittle money. It was more about supporting a company that really makes some superior stuff! I love their bits, blades and everything else (I can afford).

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