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Help with rake and splay

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Forum topic by dfox52 posted 10-07-2016 05:58 PM 391 views 0 times favorited 6 replies Add to Favorites Watch
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dfox52

21 posts in 1153 days


10-07-2016 05:58 PM

Can anyone point me to a good, detailed idiots guide to constructing rake and splayed chairs? Particularly I need help with determining and cutting the angles on the front and back skirts. I am attempting to make a high chair and so far I have built two identical side assemblies (each with two legs and a skirt raked at 80 degrees. They look like the letter “A”). But my brain starts to melt when I try to connect the side assemblies together with front and back skirts cut to the same angle for the splay. There is something peculiar going on with the four angles and my brain is melting trying to figure it out. It is almost as though a square is not a square! I am willing to pay for some good educational material.

Thanks!


6 replies so far

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HokieKen

1735 posts in 598 days


#1 posted 10-07-2016 06:06 PM

I may misunderstand but, from what I can tell, the rake of the side assemblies shouldn’t have any effect on the angle of the skirts that sets the splay. Seems like it would just be a 5 degree cut on the ends of the skirts.

-- Kenny, SW VA, Go Hokies!!!

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dfox52

21 posts in 1153 days


#2 posted 10-07-2016 06:51 PM


I may misunderstand but, from what I can tell, the rake of the side assemblies shouldn t have any effect on the angle of the skirts that sets the splay. Seems like it would just be a 5 degree cut on the ends of the skirts.

- HokieKen

Thanks! Why only 5 degrees?

I have them cut at 80 degrees (10 degrees off 90) to match the rake. But when I try to clamp it all together for a test fit, I can’t seem to make the four legs form a square at the top.

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jerryminer

528 posts in 901 days


#3 posted 10-08-2016 09:54 PM

If you are splaying the legs in two directions, you have compound angles to deal with—-the joints will need to be cut a little off square .

Here is an on-line calculator that will do the math for you: Calculator

Or, you can lay out the cuts empirically.

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dfox52

21 posts in 1153 days


#4 posted 10-09-2016 08:43 AM


If you are splaying the legs in two directions, you have compound angles to deal with—-the joints will need to be cut a little off square .

Here is an on-line calculator that will do the math for you: Calculator

Or, you can lay out the cuts empirically.

jerryminer

Thanks jerry… I figured there is something funny going on with the angles. I apologize but my geometry skills are limited. I’ve looked over the link you posted and basically it confirms my suspicion that I need to do more than simply cut all four aprons at 80 degrees on my miter scale. I am having trouble though relating this calculator to my specific application.

By “Empirically” do you mean “trial and error?”

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jerryminer

528 posts in 901 days


#5 posted 10-09-2016 06:07 PM

Finding the angles empirically: If you put two opposite sides together with square, 80-degree rails, then prop the parts up to their intended positions, you can temporarily clamp the other rails in position and mark the angles directly from the parts they are intended to meet.

Hard to describe. Here is a crude drawing of the concept:

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dfox52

21 posts in 1153 days


#6 posted 10-09-2016 07:43 PM


Finding the angles empirically: If you put two opposite sides together with square, 80-degree rails, then prop the parts up to their intended positions, you can temporarily clamp the other rails in position and mark the angles directly from the parts they are intended to meet.

- jerryminer

Thanks so much… I just did like you said and marked the angles “empirically.” I used some scrap pine and fine tuned with test cuts. Appreciate your help :)

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