How to Machine Square Corners with CNC Milling

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Adding radiused corners (fillets)

The simplest way to resolve the ‘Inside Corner’ problem is to add a radiused corner (also known as a fillet). If the corner does not interface with other parts, this is the best option.

The size of the cutting tool often determines the size of the fillet. However, try to use the largest radius possible to reduce costs where possible. This is because machining time is partly determined by the size of the cutting tool. A smaller cutting tool requires the CNC milling machine to run at a slower speed, therefore taking longer to remove material. Also, if the milled pocket is deep, a larger, more robust cutting tool will need to be used. This means a larger radius would be required. A rule of thumb is to keep the corner radius greater than ⅓ cavity depth.

At Get It Made,  our typical minimum fillet radius is 1.5 mm. It is, however, possible to reduce this if necessary for specific materials. We can use a smaller 1 mm diameter cutter to produce a radius of 0.5 mm, but it increases costs and isn’t always possible for every design.

Now consider there is a mating part that is square and needs to fit into a pocket on your part. In this case, dogbones can provide an optimal solution.

5. Random corners

Did you know that you can create interesting shapes like guitar picks and organic cells with nothing more than border-radius?

border-radius supports eight values seperated by a slash. According to W3C:

If values are given before and after the slash, then the values before the slash set the horizontal radius and the values after the slash set the vertical radius. If there is no slash, then the values set both radii equally.

Start by creating a simple square.

The easiest way to create a random corner is to use four values.

In this example, you can see that all the corners have the same roundness across the vertical and horizontal axes. There are eight values in border-radius you can use to change it.

This lesser-know feature is very effective in creating beautiful corners. If you’re bored and feel like playing with the values to create random corners, try messing around with this visual tool.


A simple dogbone extends the corner in a single direction; this is referred to as a ‘T-bone’ corner. The dogbone should be ‘pushed into the part’ by at least the radius of the circle. There is, however, no requirement to go further than one radius.


  1. Betsey Betsey says:

    August 28, 2020 at 9:01 am

    My favorite corner pusher is a bone folder – from my paper crafts supply of tools. I have almost all of the options you have shown and a few more, but my bone folder makes the best pointed corners.


    1. Nicki Nicki says:

      August 28, 2020 at 4:51 pm

      Thanks for sharing, Betsey! I had never heard of a bone folder and had to look it up. When I saw the picture of it, my heart jumped. I’m pretty sure I have one in a box of miscellaneous sewing things my mom gave me and didn’t know what it was. Now I need to see if I can find it! I can see why it is you’re favorite!


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Three Day Advanced Course Goals

  • Understand Weight Transfer
  • Throttle Management
  • Left Foot Braking
  • Adapt to Understeer and Oversteer
  • Induce and Correct Slides
  • Drive the Proper Rally Line
  • Straight Line Braking
  • How to Maximize Traction
  • Trail Braking
  • Adapt to Changing Conditions
  • Pendulum Turns
  • Proper Use of the Hand Brake
  • Recognize and Adapt to Different Surfaces
  • Recognize Limits
  • Driving Real Roads
  • Basic Understanding of Rally Navigation
  • Handbrake with Downshift
  • Linking Corners
  • Acute Corners
  • Overlapping Pedal Inputs
  • Reading Roads
  • Processing Pace Notes

How do you square up a square?

How do you true a square? Use a pointed steel punch (an old nail set also will work) and a good-sized hammer to strike the square at either the inside or outside corner of the square, and check it again for squareness. Striking to the inside corner will widen the square, while striking to the outside corner will constrict the square.

What is the rough opening for a square door?

How far out of square is acceptable? Foundations walls should be level within 1/4 inch in 10 feet, while the entire foundation should be level within 1/2 inch. The Handbook states that there is no single accepted tolerance for rough framing, although a tolerance of 1/4 inch in 10 feet is frequently used and is acceptable.

How do you layout a corner?

How do you edge rough lumber?

How do you square twist lumber?

How do you square lumber without a table saw? You have 2 options without a table saw:

  1. Put your board, on edge, on a sled for the last step and run that through the planer. The major problem is that you’re limited on width of the board to however high your planer can raise. …
  2. Use a straight edge jig with your circular saw.

One Day Course Goals

  • Understand Weight Transfer
  • Throttle Management
  • Left Foot Braking
  • Adapt to Understeer and Oversteer
  • Induce and Correct Slides
  • Drive the Proper Rally Line
  • Straight Line Braking
  • How to Maximize Traction
  • Trail Braking
  • Adapt to Changing Conditions

How to know what to choose among various suggestions given for How To Square A Corner?

The system can give more than one answer for How To Square A Corner, we also can’t say which the best one is. The best choice depends on the usefulness of each solution to each person. Normally, the ones that satisfy the majority will be on the top.

3 Replies to How to create fancy corners with CSS

  1. helo helo says:

    July 5, 2020 at 6:28 pm


  2. Paulla Paulla says:

    February 14, 2022 at 1:07 pm

    What is a “nootched” corner?

    Also, the “random” corners aren’t “random” at all.

    1. Mike Flanagan Mike Flanagan says:

      February 14, 2022 at 2:32 pm

      Thanks for pointing out this typo — it’s fixed now. We also changed references to “random” corners to “irregular.” Thanks for reading and for the tip.

Video Using Needle and Thread to Pull Out a Corner

When you use a needle and thread to turn a corner, you get perfect results every time.

Tip: Before you can use this method, you need to know how to tie a knot in thread.

CSS border-radius – Specify Each Corner

The border-radius property can have from one to four values. Here are the rules:

Four values – border-radius: 15px 50px 30px 5px; (first value applies to top-left corner, second value applies to top-right corner, third value applies to bottom-right corner, and fourth value applies to bottom-left corner): 

Three values – border-radius: 15px 50px 30px; (first value applies to top-left corner, second value applies to top-right and bottom-left corners, and third value applies to bottom-right corner):

Two values – border-radius: 15px 50px; (first value applies to top-left and bottom-right corners, and the second value applies to top-right and bottom-left corners):

One value – border-radius: 15px; (the value applies to all four corners, which are rounded equally:

Here is the code:


#rcorners1 {  border-radius: 15px 50px 30px 5px;  background: #73AD21;  padding: 20px;   width: 200px;  height: 150px; }#rcorners2 {  border-radius: 15px 50px 30px;   background: #73AD21;  padding: 20px;   width: 200px;  height: 150px; }#rcorners3 {  border-radius: 15px 50px;  background: #73AD21;  padding: 20px;   width: 200px;   height: 150px; }#rcorners4 {  border-radius: 15px;   background: #73AD21;  padding: 20px;   width: 200px;  height: 150px; } Try it Yourself »

You could also create elliptical corners:


#rcorners1 {  border-radius: 50px / 15px;  background: #73AD21;  padding: 20px;   width: 200px;  height: 150px; }#rcorners2 {  border-radius: 15px / 50px;  background: #73AD21;   padding: 20px;   width: 200px;  height: 150px; }#rcorners3 {   border-radius: 50%;  background: #73AD21;  padding: 20px;   width: 200px;  height: 150px;} Try it Yourself »

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