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Rocking Chair: An Online Course #7: Clamping Form for Bending 8 Strips to Make Rockers

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Blog entry by HappyHowie posted 02-28-2016 04:52 PM 1009 reads 0 times favorited 1 comment Add to Favorites Watch
« Part 6: Jeff Miller's Router Mortising JIG Part 7 of Rocking Chair: An Online Course series Part 8: Router Circle JIG or Trammel Arm »

I have bought the 3/4 inch plywood I will need in order to make the bending form JIG to make this chair’s two rockers. I got a clarification from Tom, my online instructor, for the undocumented radius for the outer form’s radius.

The inner radius was clearly marked on the full sized plans to be 42 inches. I did not see any documentation for the outer’s curve radius, but it could be deduced with math. The rockers are made from eight 1/8 inch thick strips plus two clamping cauls of 1/8 inch thick masonite waxed up would be inserted between the outside of the glued striips and between the clamping form. So do the math: eight 1/8” strips plus two 1/8” gluing cauls equals 1 1/4 inches. Thus, add that to the inner curves’ 42 inch radius gives us a 43 1/4 inch radius to make the outer clamping form’s curve.

I will make a compass that I can change the radii or radiuses. I’ll strike the curve on a 1/4 inch masonite board where I can then cut out the pattern on my bandsaw. Tom, I believe used a plunge router and cut it the pattern that way. I can give that a try also.

The close-up view of these clamping forms to make the rockers.

-- --- Happy Howie



1 comment so far

View CaptainSkully's profile

CaptainSkully

1429 posts in 3019 days


#1 posted 02-28-2016 08:42 PM

Howie,

I’m following your build blog with great interest. You’re doing an amazing job with both the build and the documentation. Thank you from those of us that are following your progress. I contacted Epic Woodworking regarding the plans, so once I have my shop setup, this is definitely on my bucket list. Thank you for bringing EP to my attention.

-- You can't control the wind, but you can trim your sails

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