woodbutcher453
Established Member
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- 20 Jun 2010
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Chairs are THE most difficult and complicated thing that any woodworker can make because there isn't one answer. These are my views and please feel free to disagree with me. In fact... I would encourage it, because if we were all the same, the world would be a boring place !
Wood expands across the grain and not with it. Ignore that fact at your peril. That's the problem...!
But it's not a problem, it's a creative asset. Necessity is the mother of invention. This is one of my 'solutions'
You build a framework, but if you're using big flat areas, you have to allow for movement. The seat's easy... it's just a big chunk on sliding joints, gravity holds it in the right place, but the back... that's a whole different thing.
The rails have the grain running side to side whereas the upright pieces have the grain going up and down. You could just use a big bit for the back. That's where ergonomics raises it's head. Your behind is a bulging lump of fat and is quite happy to sit on a big flat surface. Your back is a marvel of biological engineering and finds leaning against a flat surface uncomfortable, mainly because we have a big bony spine thing that stands proud of the surface.
You could carve out a curve in the back but this would take ages. You could laminate the back to have a curve in it, but while the edge can be aesthetic, on most occasions it isn't. This is what I mean about there not being one answer.
My choice was to split the back in two and angle the pieces forward at the outside edges.
This angle is determined by the shape of the top rail, which stops it being flat and makes it more comfortable. Each backpiece has fixed points (fp) on the top rail and the bottom rail but by the middle edge. The outside edge has a sliding joint (sj) on the top rail that consists of a dovetail shaped piece of nylon fixed to the rail, fitting into a dovetail slot in the backrest piece This allows the pieces to expand and contract while the dovetail stops it from being levered away.
All this tinkering has it's aesthetic benefits by adding a bit of visual interest.
I'm not saying 'THIS IS HOW TO MAKE A CHAIR' It's just A solution... when we have a cure for cancer and can travel at light speed we will still be arguing about chairs..!
Wood expands across the grain and not with it. Ignore that fact at your peril. That's the problem...!
But it's not a problem, it's a creative asset. Necessity is the mother of invention. This is one of my 'solutions'
You build a framework, but if you're using big flat areas, you have to allow for movement. The seat's easy... it's just a big chunk on sliding joints, gravity holds it in the right place, but the back... that's a whole different thing.
The rails have the grain running side to side whereas the upright pieces have the grain going up and down. You could just use a big bit for the back. That's where ergonomics raises it's head. Your behind is a bulging lump of fat and is quite happy to sit on a big flat surface. Your back is a marvel of biological engineering and finds leaning against a flat surface uncomfortable, mainly because we have a big bony spine thing that stands proud of the surface.
You could carve out a curve in the back but this would take ages. You could laminate the back to have a curve in it, but while the edge can be aesthetic, on most occasions it isn't. This is what I mean about there not being one answer.
My choice was to split the back in two and angle the pieces forward at the outside edges.
This angle is determined by the shape of the top rail, which stops it being flat and makes it more comfortable. Each backpiece has fixed points (fp) on the top rail and the bottom rail but by the middle edge. The outside edge has a sliding joint (sj) on the top rail that consists of a dovetail shaped piece of nylon fixed to the rail, fitting into a dovetail slot in the backrest piece This allows the pieces to expand and contract while the dovetail stops it from being levered away.
All this tinkering has it's aesthetic benefits by adding a bit of visual interest.
I'm not saying 'THIS IS HOW TO MAKE A CHAIR' It's just A solution... when we have a cure for cancer and can travel at light speed we will still be arguing about chairs..!