Quick Tip to Find the Center of a Circle With a Square
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- čas přidán 31. 07. 2018
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If you think that framing squares only belong on a construction job site, you couldn’t be more wrong. They’re also very useful to have in your shop. Here’s a great example. Need to find the center of a circle? You may not believe it, but you can easily do this with a framing square. There are a handful of things you have to watch out for as you’re setting up the process, but we point them all out in this video. You won’t believe how easy this is to do.
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HOW SIMPLE IS IT?
All that’s involved to make this happen, and make it happen accurately, is careful alignment between the legs of the square and the circle itself. If you take your time and pay attention as you do this step, your accuracy on locating the center of the circle will be very good.
MORE WITH FRAMING SQUARES
Framing squares are definitely not one trick ponies. There are many more ways you can use them in your shop. Have a look at these other great tricks:
Make a circle with a framing square
Use a framing square as a cutting guide
Set angles on your miter gauge with a framing square
You can see what an amazingly versatile tool a framing square is. These are great tools to have in the shop, providing A LOT of bang for the buck.
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Thanks! I had my geometry students watch your video and figure out what theorem we learned in geometry justifies the method you used.
Thanks so much
I really like this idea. If you line your corner up with one of the first marks on the edge of the circle when doing your second marks, you'll get more of a perpendicular line so your X in the middle is a little more distinct. Such a simple way to find the center, thank you!
Alot easier and quicker than using that "bullseye"guage for the lathe..good stuff George
Yes, this is a simple and accurate method, better than most other rather laborious ways.
To help with placing the tip, it may be useful to lay a rule as a tangent and then butt the tip against the rule.
Great tip! Thank you for adding to the conversation.
If you when setting the corner use the same distance from the corner on both legs, it is much easier to pin down. Maybe he was doing so ?
Just make the square outside the circle with all lines just touching the circle then draw two diagonal lines across the square and where they intersect is the centre of the circle.
Another simple way is to measure across the circle and mark the outside of the circle on both sides at the largest meaurement possible then draw a line across at the two marks and bisect it, that is your centre of the circle.
always educational and informative
Great tip.
Thank you for sharing...
Great tip, George
Thank You!!!
That's brilliant!
Thank you for sharing :)
it's a lot quicker and easier if you use a plumb line on the left side and a horizontal on the bottom then do the same on the right side with the horizontal on the top of the circle Then draw a line from both diagonal corners and where they meet is the exact centre of the circle
The square, may also be used OUTSIDE the circle.....left side / then right side.
You got close to a method I figured out, but yours seems to have a very shallow crossover angle at center, which is very difficult to see or mark for accuracy. Mine started out exactly like yours until the flip step. For mine, at the flip of the square, you'd align with the pre-drawn lines where they cross over the circle, while keeping the square parallel with one of the pre-drawn lines. Taa-daa! Instant mirroring of lines and connecting the corners with lines diagonally will show center.
Thanks for the tips!
If only I could remember all these. Not how but that it’s possible. If I only know it’s possible I can figure it out or look it up. Thanks for tip!
Yes you can find it in Audel's Steel Square. First published in 1923. . .
@@vileguile4 It's a book.
You mean connect one side second mark to opposite side first mark then repeat with remaing marks. Point of Interesct is the center of the circle, correct?
Yes, that is correct.
Paul
@@Wwgoa
Thank you.
Hmm? Need to check
It's much easier to square of the outside lines of the circle
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Anyone want to explain the geometry behind why this works?
This is an application of Thales' Theorem. You'll find that on Wikipedia. tl;dr: If you construct a triangle on the diameter of a circle, the triangle will have a right angle at the circumference of the circle. This trick is that theorem applied backwards, i.e., you set the right angle of the framing square on the circle, so the hypothenuse will be a diameter of your circle. Do that twice, and where the diameters intersect is your center point.
@@schm4704 , thank you so much for the reference! I looked up "Thales Theorem" on Wikipedia. I love the motion gif there, which really shows the action of the theorem. Thanks again.
Thales’ theorem anyone?
Didn't work out...