Reply by RogerInColorado

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Posted on A 25 ft trammel in the parking lot

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321 posts in 1916 days

#1 posted 04-10-2013 04:42 AM

I used a trammel to make some long arched trim pieces for valances. The calculator I used for computing the arc given the width of the arc and it’s length is

I used two 2 inch wide strips of 12 inch plywood with another shorter strip glued to join the long strips end to end to get the ability to scribe a 12+ foot arc on a 2 foot “high” by 8 foot wide sheet of 1/2 inch plywood. I used a nail at both ends of the arc, one as the scribe and one as the pivot point. I used foam mounting tape to fix a piece of half inch plywood to the floor of my garage to drive the pivot point in to and I had a helper hold the pivot while I stood on the target end and scribed the arc on the soon to be template. Then we moved the pivot point to a new radius to scribe the lesser arc. We cut the template and made sure it was as good as we could fair it before using it as a template to route our clean valance trim.

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