How do you do it?

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Blog entry by RussellAP posted 03-13-2012 02:28 PM 1147 reads 0 times favorited 4 comments Add to Favorites Watch

Ever have to pull a perfectly curved line out of your back side when you change a design, or just add to one? I usually just tie a pencil on a string and find a fulcrum somewhere until it gets the curved line where I want it. I can’t help thinking all the time I’m doing this that some LJ has a better way that doesn’t involve tons of math.

How do you do it?

-- A positive attitude will take you much further than positive thinking ever will.

4 comments so far

View Gene Howe's profile

Gene Howe

10628 posts in 3484 days

#1 posted 03-13-2012 03:12 PM

I could never keep the pencil straight! Then, aha. I saw an Incra jig for drawing straight layout lines with tiny holes for a pencil lead. Thus was born my arc/circle maker. An 18” lath (could be any length) with a series of 3/32 holes 1/4” apart and one for a finish nail in the end. Then, I went further and added a square of 1/2” ply to slip under the nail hole and used double stick tape to hold it to the work, then nailed into that.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View BritBoxmaker's profile


4611 posts in 3092 days

#2 posted 03-13-2012 04:53 PM

Draw it in CAD. Print it full size. Double-sided tape it to the work-piece. Cut to the line. Simples!

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging.

View Mark Shymanski's profile

Mark Shymanski

5621 posts in 3768 days

#3 posted 03-13-2012 11:18 PM

I have a box full of cartographer/drafter thick plastic curves. They work pretty well.

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View Craftsman on the lake's profile

Craftsman on the lake

2796 posts in 3493 days

#4 posted 03-13-2012 11:31 PM

Well, a formula for the radius and a long sticked jig to guide the router is my way for long arcs.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

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