Chevy Migraine

I’ve been stalled the past couple of days on the Chevalet.  The blueprints are missing the level of detail that I tend to put into plans.  It’s all stuff you can figure out, but I like to have a specific plan before I start marking out and cutting.

I have all of the “beams” glued up and trued for the saw support arm, and I was going to start with this joint here.  In the Chevys at school this was, I believe, a “triple tenon” joint, although that’s not called out in the plans.  Since my parts are different sizes as a result of working with the wood I have available, I needed to make some adjustments in the joinery here.

I thought this joint was my next step...

I thought this joint was my next step…

Because my horizontal arm is slightly thinner and wider than the plans, there isn’t enough meat to cut a through mortise and two half mortises on the faces, so I’m going to do a bridal joint.  But that got me thinking about the length of this vertical riser…

The horizontal piece I have is a little different in size than the plans too.  Crud.  Which means that the vertical adjusters on the ends need to be sized differently.  In short, I needed to re-design and build from the opposite end of this assembly.

I sat down at the computer yesterday and drew of the horizontal arm that supports the saw adjusters, and then drew those up too.  I tried to include the critical dimensions from the plans, I need to have the saw itself end up in the same position relative to the vise jaws when I’m done jiggering around with everything.  Once this assembly is done I can make the vertical member to ensure this is at the right height for the upright.  I’m going to make one more check of the measurements before I lay out and cut the two vertical adjusters and the horizontal piece.

My CAD mockup of the saw support arm, based on the wood I have and the hardware kit.

My CAD mockup of the saw support arm, based on the wood I have and the hardware kit.

Categories: Uncategorized | Tags: | 3 Comments

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3 thoughts on “Chevy Migraine

  1. Instead of a bridle joint how about a dovetail one?

  2. I was thinking along the same lines as Ralph. Dovetail joint. You could also add length so that the vertical piece extends below the horizontal arm. Then you could use a wedged thru mortise and tenon. It’s always a challenge to modify plans on the fly.


  3. I could see a giant dovetail joint working too. The Sketchup drawing is maybe a little misleading, the joint will actually be set back an inch from the end of the arm, but if I put it right at the end then the dovetail joint would resist racking along the length of the horizontal arm getter than a bridal joint.

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