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    • CommentAuthorDan CNY
    • CommentTimeJul 2nd 2011
     
    I would like to know what is the best technic for creating the mortise and tenons on a project I'm working on. It is a child's chair. The legs of the chair look like a letter "L" that is at an angle less than 90 degrees. My thoughts are that it would be stronger to make the mortise at an angle to the edge of the talk part of the leg. The other choose is to make the mortise at 90 degrees to the edge of the long leg.

    I would appreciate your input.
    • CommentAuthordusty
    • CommentTimeJul 3rd 2011 edited
     
    I prefer the through mortise and tenon depicted in the upper image. I believe it is stronger because of the larger glue surface and because it is perpendicular to the most likely force that will be applied (downward). I also believe that a finished through mortise is more eye appealing. It looks professional.

    The other MT is smaller and downward force would be acting to pull the tenon from the mortise. Because it is smaller there is less glue surface. I do not mean to say that this joint is weak. If cut to fit snug and glued properly (all mating surfaces get glue), this is a strong, reliable joint.

    When made correctly either of the joints that you have shown will hold up to even the roughest of wear and tear. The choice is just that - choice based on personal preference.

    Good luck with your project and please show us the results.
    • CommentAuthorDan CNY
    • CommentTimeJul 16th 2011
     
    Hi Dusty,

    Thank you for getting back to me and so quickly.

    So the upper one with a through tennon will be the better of the two (2). I think it will be easier to make since the mortise is perpendicular to the board.

    Thank You,

    Dan
    • CommentAuthordusty
    • CommentTimeJul 20th 2011
     
    Actually, cutting a mortise at an angle like that is not difficult. Simply lift one end of the stock while the other end remains firmly on the table and cut. The trick is lifting the one end the correct amount and doing the same for every piece to be mortised.

    Ahhh, it is time to build a jig. Maybe one that is micro-adjustable.
    • CommentAuthorDan CNY
    • CommentTimeJan 31st 2012
     
    Dusty,

    I'm working on my 2nd chair. Used the through tennon and pinned it. It was strong enough to hold my weight and stand without even gluing it or putting the pin in. The glue and pin is just for extra protection. I will post pictures soon. There were a few other obstacles that I had to over come and I had several other projects that took priority.

    Thank you for the advise and ideas.
    • CommentAuthorDan CNY
    • CommentTimeJan 31st 2012
     
    Used the through tennon and pinned it. It works great! I actually dry assembled the whole chair and was able to sit init. It past the test with no glue and no pins. Very strong. The glue and pin are just for extra protection. Will post pictures soon.
    • CommentAuthorDan CNY
    • CommentTimeJul 25th 2012
     
    Here are the pictures. The chair is working great! The Grand Kids are putting it to the test. Attached are a couple of photos of the joints and the final chair.
    • CommentAuthorDan CNY
    • CommentTimeJul 25th 2012
     
    Here are the pictures
      IMG_0245__ww2.JPG
    • CommentAuthorDan CNY
    • CommentTimeJul 25th 2012
     
    Here is the picture of the assembled chair.
      IMG_0247__ww2.JPG
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