Understanding Compound Miter Geometry and Settings

This video describes compound miter geometry and shows the methods I use to determine the proper fence and blade tilts to make compound miters. I will show how I make and test the results of a compound miter. Also is a sneak peek at the Hoffmann dovetail joinery I used fasten/clamp the joint.
My favorite compound miter calculation aide is from Matthias Wandel which can be found in either PDF or Excel spreadsheet format at: woodgears.ca/miter/

[@GK-ye3fr]

Yes, I would like to see a video of the Hoffmann making a compound miter joint. It would also be nice to see a top-down video of you cutting a miter on your Martin MiterX.

[@extremewoodworker]

Thank you GK. I'll see if I can figure a way to do that. Steve

[@MrPatdeeee]

Hi kind Sir; I would like for you to make a video; showing combine angles as you did. Thank you Steve. Always a joy to see your video's.

[@extremewoodworker]

Thank you for the kind words Pat. Steve

[@edehrenwlad1408]

Thank you for sharing.

[@extremewoodworker]

Glad you enjoyed it Ed. Steve

[@someGUYwithADHD]

"The easiest way to get a compound miter cut... is to start with a compound miter cut.."
"Trigonometric" (is this a word?)
All joking aside... thanks for this video man

[@Parafinn1970]

I would love to see how you do those dovetail keys. Especially on a compound angle 🤯

[@extremewoodworker]

I show how I do so in this video: th-cam.com/video/PX4NdPc22do/w-d-xo.html

[@thomasnourse7506]

Let's see the Hoffman in action!

[@extremewoodworker]

Thank you Thomas. Steve

[@AdamTheCarpenter]

Great video! Where did you get your vest??

[@extremewoodworker]

Thank you Adam. That vest is a Blaklader Bantam Kangaroo vest. This was purchased from theworkwearstore.com Steve

[@AdamTheCarpenter]

@extremewoodworker Thank you sir!

[@apriln2108]

I changed my comment because I started having trouble making angles fit. I made a splayed box with 20 degrees from vertical. So I need to set my miter to 18.88 and my tilt to 41.64. My tilt on table saw and miter saw goes from 90 to 45. How do I get those angles less than 45? All of them with 4 sides that come to 45 degrees are a tilt of less than 45. What am I missing?

[@extremewoodworker]

The chart indicates the blade tilt off the vertical. Steve

[@apriln2108]

@@extremewoodworker I finally figured that out and got some good joinery!

[@Max-om7bk]

If you did the full geometric mathematics method I would watch that video.

[@extremewoodworker]

That would be an analytics killer video and not in a good way. LOL

[@zachariah1991]

So in the simplest form you need this tens of thousands of dollars set up to do it 😂

[@extremewoodworker]

Nope, use what you have and be as accurate as possible.

[@tracygay9370]

I'm sure you will get the correct cut but imagine doing it on tools the common fella has.

[@extremewoodworker]

I have and I had those tools for many years. Do not believe for a second that I have always had my current tools and machinery. And yes, it can be done with basic tools. Steve