## Spherical radius

## Spherical radius

(OP)

Hi folks,

I want to understand the concept of spherical radius (SR).what is the difference between radius and spherical radius?Could you please share some insights? thanks in advance.

I want to understand the concept of spherical radius (SR).what is the difference between radius and spherical radius?Could you please share some insights? thanks in advance.

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Thanks for your interest.could you pls explain me this image?

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It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

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Thanks for your reply.I want to basically umderstand the reason behind the term spherical radius and why it is not called a mere radius like in ordinary cases.

P.S : I am not very Strong in drawings.kindly request you to guide me.

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Ted

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Thanks a lot for your replies.can we conclude that spherical radius indicates spherical surface when mentioned as SR?

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Based on your original post SR means spherical radius.

Other requests for additional information, I am a bit perplexed as to what information you are hoping to gain from this thread.

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What i undeestand is spherical radius is the radius which is same along the two planes unlike a cylindrical radius.please correct me if i am wrong.

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Ted

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Thanks for all your replies.Now i have understood the concept.hope i will get it better if i put it in practice.

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the only reason for the addition of the term "spherical radius" in the 2D drawing/drafting world is to more clearly denote on a drawing what is being referred to - it is often not immediately obvious when a feature is actually spherical from looking at a 2D view so the term spherical radius and the symbol <SR> is utilized to make this clear in engineering drawings. see the below application from the Y14.5-2009 standard - one might be able to infer that its a spherical feature on the end, however when creating drawings one needs to be as unambiguous as possible to prevent confusion - hence the term spherical radius. also FYI this would be a better question for the "Drafting Standard's, GD&T, and Tolerance Analysis" forum https://www.eng-tips.com/threadminder.cfm?pid=1103

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Excellent!Thanks a lot for your insights.

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Spherical radius : the distance a ray extends in any direction from a single point in space

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Now if you use a compass and draw a nice circle on a piece of paper, that is the 2 dimensional view and if you draw a straight line from the center point where the compass point was put, to the curve of that circle that line represents the radius.

If you use some thing to measure the ball on the outside and find the largest points by moving the measuring tool around to find them. You simply take that measurement and divide by 2 and you will have the spherical radius.

A sphere every point on its surface is equidistant from its center. And if you cut that sphere in half in any direction you choose, and look at that cut straight on perfectly square to the cut, you will see the 2 d radius that you just used the compass to draw. Is this a simple enough explanation?