Bottom of Mortise Using Domino

[extiger]

Does the Domino create an arched bottom in the mortise trench? Or is it flat?
And does this matter as far as glue-up strength is concerned?

Gary Curtis

 

[sw1211]

Flat, the strength comes from the glue area on the various sides of the dominos.

 

[RogerF]

I believe it is SLIGHTLY convex at the bottom. The important fact is the sides are parallel. The tiny amount of space at the end is negligible and as Steve says the strength comes from the large face grain surfaces of the tenon.

 

[MarkF]

Click on the top video Brice has posted and see what the bottom looks like:
http://www.burrellcustomcarpentry.com/Download.html

There's also a video somewhere that shows a Domino being cut into plexiglass but its location escapes my memory at the present.  Maybe someone here remebers where it is.