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Showcase cover image for Compound Angle Sine Plate Jig

Project Information

Our neighbor recently asked if I could make her a small chair for her daughter. The little one is going to be home schooled and she needs stuff for her study/work area. Without thinking, I said "Sure, I can do that"! Well hind sight is 20-20 and now I realize why chairs are not cheap!

The neighbor sent me a link to the type of chair she wanted- I was in trouble!! This chair wasn't going to be 1x material screwed and glued together! Other than the seat and top rail, everything was turned and there is not one 90° angle on the entire piece. In fact almost every hole is drilled at a compound angle. Second problem- no plans!

So, where to start??

Fortunately, I have a very old child's chair that belonged to my Dad. Unfortunately, it was much too small for the little girl. I figured I could use the old chair and scale up the dimensions and create a larger version. A little Internet research and some actual child measurements and I have the sizes I need to start.

But those dang compound angle holes are going to be a pain. For accuracy, I'd like to use the drill press for the holes. But, you know how hard you work to get the drill press table perfectly aligned and once there you hate to change it. Maybe there is a way to make a jig!

Her's what I came up with…

The jig sets on the drill press table and pivots/tilts in 2 directions.

The new "table" can be raised or lowered via some piano hinge pieces left over from another project.

The assembly pivots on a large dowel (piece of turned maple) to add the "second" angle.

The tilted assembly and table are held/locked into place with plastic knobs and hardware

And the entire jig is bolted onto the drill press table.

I know what you are thinking- all that work for one chair. Maybe, but she has 2 daughters and lots of other home schooling friends. Just planning ahead.

Thanks for looking!

Gallery

Comments

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5,820 Posts
That's one complex jig. You've really thought this through-nicely done.
 

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4,024 Posts
Nice tool and a good design/build on it.
 

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11,525 Posts
Well built and thought out jig. Great job.
 

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7,866 Posts
well dang lew, ive had that same jig just sitting over in the corner of the shop, i could have sent it to you..:)...well at least you know how to make one now…so get busy and lets see the chair…oh…i have another corner in the shop, guess what is sitting there…::))
 

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35,383 Posts
Great Lew
 

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596 Posts
I've started with this idea no less than 4 times in the last few years, but was conveniently distracted at the hard part :)
 

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944 Posts
That device on the drill press is one unique jig. The chair and desk must be great as well. Seems like woodworkers usually say yes to special request projects then figure out how to make them. Good work.
 

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5,351 Posts
I open my big mouth too many times also. Oh well, all good in the end.
The jig thingy looks great, now on to using it.

Steve
 

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1,798 Posts
Looks like you were determined to make it work. Nice jig setup.
 

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13,709 Posts
Thanks everyone for the kind words. And, yes, she has asked for another chair!
 

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4,279 Posts
I will tuck this in my bonnet for future needs….......good solution. Still on my cruise, but will be home this weekend. Itching to finish some stuff in the shop….......
 
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