This Week in Wood Rotating Header Image

Mortise and Tenon Practice

I’ve been practicing Mortise and Tenon joints for the past couple of days.

I’ve found some things out about hand cut Mortise and Tenon joints.

  • Shallow mortise/tenons are easier to keep square
  • Conversely, deep mortise/tenons are much harder to keep square
  • Deep mortise/tenons can be tuned a bit to make square after they are cut
  • Keeping the mortise inside the marking lines is simpler than I thought (probably due to sharp chisels)
  • Using drill bits to plow out material sounds like a great idea but is much harder than I thought.  In order to accomplish this, you need to have a center line in addition to the other marking lines for the mortise.  Getting that center line exactly centered is quite a challenge.  That of course doesn’t say anything about how challenging it is to get the drill bit to start in the middle too.
  • Shoulders are super important to get a really crisp/tight fit.  It can be tuned a bit too.
  • Square in all directions is harder than it sounds


My first few were pretty bad.  As you can see from above though, I finally did pretty well.  My next one wasn’t so good though but I was able to tune it up and get a pretty satisfactory fit.  I’m going to keep practicing though and hopefully get a really consistent fit.  My next project (see earlier post) will have quite a lot of these joints so I need to get it tight.

Leave a Reply