Author Topic: How do you choose the best domino length?  (Read 395 times)

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Offline smr.111

  • Posts: 1
How do you choose the best domino length?
« on: August 08, 2018, 08:47 PM »
I've searched the forum and can't find any relevant information related to this.  I am looking for information on choosing the correct domino length for various applications.  In understand the concept of using a domino thickness that is 1/3 of the material or using multiple dominos in a large joint for increased strength.  I've also read a number of articles on mortise and tenon.  However, the general rule of thumb for length with M&T appears to be simply that the tenon is at least twice as long as it is wide.  We obviously have significantly more options that with the domino system.  What I can't find is any information on when to use a 8mm x 100mm domino vs a 8mm x 40mm domino.  Should I always use the longest domino that will fit in the material?  This would seems unnecessary in many cases, but will this create the greatest strength is solid wood (ie material that is equally as strong as the tenon-not plywood or MDF)?  Any information would be very much appreciated.

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Offline Birdhunter

  • Posts: 2232
  • Woodworker, Sportsman, Retired
Re: How do you choose the best domino length?
« Reply #1 on: August 08, 2018, 08:54 PM »
My thought is that I use the longest tenon I can without it poking out the backside of the piece. I think this spreads any bending, tensile, or torsional loads out over a larger area than a stubby tenon.
Birdhunter

Offline clark_fork

  • Posts: 265
Re: How do you choose the best domino length?
« Reply #2 on: August 08, 2018, 09:37 PM »
I use Dominos for leg and apron assembly and to maximize the Domino length, I will cut the ends at 45°. I have a jig to cut these safely. Another item to keep in mind is that the mating holes do not have to be the same depth to achieve strength.



My starting point is this simple guide.

Clark Fork

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"straight, smooth and square" Mr. Russell, first day high school shop class-1954

" What's the good of it?" My Sainted Grandmother

"You can't be too rich, too thin or have too many clamps." After my introduction to pocket joinery and now the MFT work process

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don't hesitate to make it beautiful." -- Shaker dictum