The July 1993 edition of Popular Woodworking Magazine ran an article on a gentleman who built puzzle rocking chairs for children:
The magazine article included a pull-out, full scale patterns for making the 6 piece children's rocker.
My father-in-law, Lloyd Wells, made one of these chairs for my daughter Stacy back in 1993. We still have the chair he made now, in October of 2016:
When Lloyd died back in 2004, I got the 1993 article and paper pattern from his workshop.
I scanned in the pattern, then used the JPG images to make the design in Google Sketchup. For the biggest piece, I took a digital camera photo, and used that in Sketchup. When I had all the pieces drawn, and tried to assemble them in Sketchup, they would not fit together properly???
I suspected it was the biggest piece that I took a digital photo of. I then scanned in the biggest piece, which took multiple scans. I used a free Microsoft program to stitch the pieces into one. I compared the results in Sketchup below. The scanned in version has the bird house parts shown on it, and the top of the chair side is much taller than the digital photo:
I have no idea why the digital camera photo had so much error in it, especially near the top?? I guess I learned a lesson to always scan in patterns versus using digital photos. I will have to ask one of my camera experts why this could happen.
I asked my photographer expert why the digital photo was so inaccurate...His response was......
Sketchup
The pattern calls for using 1/2" thick plywood, or 1/2" thick hard wood.
After I got the chair drawn in Sketchup, I noticed I forgot to include the handle cut-out in the back of the seat. I fixed the drawing and added the handle..........
Stay tuned as I build another one of these chairs........
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