LumberJocks

Quick Tip: Measure diameter of a circle

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Blog entry by bigfoot11 posted 01-23-2016 04:45 AM 927 reads 0 times favorited 4 comments Add to Favorites Watch

I’m in the process of making a small dust separator to work with my CNC and needed to make very tight fitting lid for a 5 gallon bucket. After fiddling for a few minutes and getting ten different measurements, it donned on me to take advantage of a flat table and some squares.

It’s so stupid simple, I can’t believe I’ve never seen it done this way before.

http://www.gowoodwork.com/2016/measure-diameter-circle/



4 comments so far

View kiefer's profile

kiefer

4991 posts in 2243 days


#1 posted 01-23-2016 04:57 AM

I have used this idea for years and it’s nothing new just a large caliper made with two framing squares
http://lumberjocks.com/projects/52977

-- Kiefer https://www.youtube.com/user/woodkiefer1/videos

View bigfoot11's profile

bigfoot11

81 posts in 1258 days


#2 posted 01-23-2016 05:06 AM

I was going to make a wooden clamp like yours but it made no sense just another thing to store.

The speed square makes it trivial to get it dead perpendicular.

View OldGuysRule's profile

OldGuysRule

130 posts in 548 days


#3 posted 01-23-2016 07:56 AM

I’ve used that method for years, only I hold them in a square and close it in until both read the same. Say like I did when measuring the lid for my dust collector. Which I don’t have a picture of me doing it. So that doesn’t help much. LOL

-- Rod P.........OLD GUY......Learning new things!

View jbay's profile

jbay

1116 posts in 475 days


#4 posted 01-23-2016 02:48 PM

If you don’t have any squares handy.
Place a mark on the edge of the bucket and line it up with a mark on a flat board.
Roll the bucket one revolution and put another mark on the board. Measure the distance between the 2 marks and divide by Pi. (3.141)

-- If anyone would like to see my Portfolio, PM me and I would be glad to send you the link.

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