How to copy a curve?

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Forum topic by JPKnapp posted 06-01-2009 04:48 AM 7672 views 0 times favorited 4 replies Add to Favorites Watch
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18 posts in 3314 days

06-01-2009 04:48 AM

I want to build a new window blind that fits a large curved window above my family room windows. Any suggestions on how to copy the curve?

-- I specialize in expensive mistakes.

4 replies so far

View tooldad's profile


660 posts in 3743 days

#1 posted 06-01-2009 04:56 AM

invest in a big copy machine???

View tooldad's profile


660 posts in 3743 days

#2 posted 06-01-2009 05:00 AM

more seriously though, I take it you are wanting the blind to follow the curve?

Grab some paper on a roll, like wrapping paper or construction paper and create a scribe using a stick with a dowel on one end and a pencil in the other. Tape the paper to the wall, and follow the curve with the dowel creating a concurrent radius or just trace the curve of the window for an exact copy. Then you can measure and do the math to figure radius. Finally transfer it to a sheet of 1/2” mdf or 1/4” hardboard for a pattern.

Remember the radius increases as you outward from the center point of the arc.

that is my suggestion

View patron's profile


13609 posts in 3369 days

#3 posted 06-01-2009 05:04 AM

if its a half circle , just measure across the opening this is the diamiter , half that an you get the radius .
hope this helps .

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View a1Jim's profile


117126 posts in 3605 days

#4 posted 06-01-2009 05:22 AM

If it’s round do as David suggest if it’s oval make a pattern with paper ,cardboard or thin strips of wood hot glued together and use your pattern to make your window blind.

-- wood crafting & woodworking classes

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