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A 25 ft trammel in the parking lot

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Forum topic by 1thumb posted 04-09-2013 11:27 PM 854 views 0 times favorited 10 replies Add to Favorites Watch
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1thumb

78 posts in 822 days


04-09-2013 11:27 PM

to cut a few 15 ft sections? Anyone ever set up, used one that long? If so, how did you set it up. I can get the plot points but not sure if that would be easier or quicker, surely won’t look as good I don’t think. Tips or suggestions appreciated. Thanks


10 replies so far

View Bill1225's profile

Bill1225

125 posts in 1065 days


#1 posted 04-09-2013 11:39 PM

I’ve used a giant trammel ( string pencil and 20d)

in parking lots all the time especially for laying out arches for windows

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1thumb

78 posts in 822 days


#2 posted 04-09-2013 11:48 PM

Nice work. I need to cut a top and bottom for an approx. 14’ section of a 50’ circle for a cabinet/counter. Tninking of cutting w/plunge router and said trammel

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Bill1225

125 posts in 1065 days


#3 posted 04-09-2013 11:52 PM

That would be a massive jig! Just a thought maybe find a large shop that has a cnc they could cut you a template in no time and probably dirt cheap

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1thumb

78 posts in 822 days


#4 posted 04-10-2013 12:26 AM

It would be massive! 5 sheets of plywood forming a “T” But I’d be done soon after spending 1/2 day setting up. I’‘ll check on the CNC. Is anything dirt cheap anymore?

View bandit571's profile

bandit571

7009 posts in 1349 days


#5 posted 04-10-2013 12:38 AM

Rebar, string line, paint. laid out a lot of curbs for concrete work. Too old now.

Formed up a curved path for a molding machine to ride on. Up in Marion, OH, there is a place that blow molds gas tanks for Honda. I helped build the factory. Ever cut a curved form, with just a circ. saw? FUN!

Pivot point, string line the length of your radius, with enough for two loops. one for the pivot point, the other for what evr marking device you are using. I’d just buy a new sharpie. make sure the string stays tightly stretched, too.

-- A Planer? I'M the planer, this is what I use

View Hammerthumb's profile

Hammerthumb

1327 posts in 641 days


#6 posted 04-10-2013 02:16 AM

I made one out of 6 inch wide strips of half inch plywood that was 17.5 feet long to cut a template that was 4ft long. The template was then used to make pieces that when laid out formed a circle that was a boarder in a hardwood floor. Cut the field of the floor with the same trammel and dropped in the border pieces. Came out perfect. It’s at a place called Thomas Pink at Caesars Forum shops here in Las Vegas.

-- Paul, Las Vegas

View Lee Barker's profile

Lee Barker

2169 posts in 1516 days


#7 posted 04-10-2013 03:54 AM

There’s a way to do this that does not require the radius of the circle. All you need to know is the length of the chord and the altitude of the arc at the center of the chord. If you’re dead set on the trammel, I’ll not bother to describe it.

It has been written of in Fine Woodworking twice in my reading of the magazine.

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View RogerInColorado's profile

RogerInColorado

293 posts in 620 days


#8 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 http://www.mathopenref.com/arcradius.html

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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Lee Barker

2169 posts in 1516 days


#9 posted 04-10-2013 12:57 PM

Roger explained it better than I could. Thank you!

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View 1thumb's profile

1thumb

78 posts in 822 days


#10 posted 04-13-2013 10:52 AM

Thanks for the replies and Roger that’s a cool website. Finally got the specs from the architect. GC told me a 25 ft radius, specs show 11ft 9 inches. GC must of confused diameter and radius. Will be much easier.

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