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Calculating the distance round an arc

  1. 01-27-2009, 06:44 AM #1
    stephen1000
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    Calculating the distance round an arc

    Hi Guys,

    Not sure I have worded the title correctly

    I am looking to calculate the distance around an arc, given A-B = 70
    and the depth is 70cm


    Thanks
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    Last edited by stephen1000; 01-27-2009 at 10:10 AM.
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  2. 01-27-2009, 07:04 AM #2
    sweep
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    Re: Calculating the distance round an arc

    To accurately determine the length of an arc you really need the radius of the circle it is taken from.

    However, it can be estimated like this


    =SQRT(A1^2+16/3*A2^2)

    where A1 and A2 are the straight line AB and the ARC AB
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  3. 01-27-2009, 07:12 AM #3
    MickG
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    Re: Calculating the distance round an arc

    Hi, Presumably the shape is an ellipse or parabola, as with those dimensions its hard to see how it could be an arc of a circle !!
    Regards Mick
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  4. 01-27-2009, 07:53 AM #4
    stephen1000
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    Re: Calculating the distance round an arc

    Hi Guys

    Not really an arc or Para whatever.

    These are made out of material and have to have a trim round the edge, looking for a way to calculate before the application of the trim


    Thanks anyway
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  5. 01-27-2009, 08:16 AM #5
    stephen1000
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    Re: Calculating the distance round an arc

    Hi Guys,

    Another one for you

    Same excel sheet, sort of a triangle need to know the length of the edge

    cheers

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  6. 01-27-2009, 09:01 AM #6
    shg
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    Re: Calculating the distance round an arc

    =sqrt( sumsq( c21-c37, b28-e23)) ~ 170.4
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  7. 01-27-2009, 09:06 AM #7
    stephen1000
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    Re: Calculating the distance round an arc

    Quote Originally Posted by shg View Post
    =sqrt( sumsq( c21-c37, b28-e23)) ~ 170.4

    Hi Shg

    Thanks for that, have you looked at the 2nd sheet I posted;
    I am looking to find the value of a side given all the other sides have sizes attached to them

    cheers
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  8. 01-27-2009, 09:08 AM #8
    stephen1000
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    Re: Calculating the distance round an arc

    Quote Originally Posted by stephen1000 View Post
    Hi Shg

    Thanks for that, have you looked at the 2nd sheet I posted;
    I am looking to find the value of a side given all the other sides have sizes attached to them

    cheers
    Just put the formula in thats AMAZING

    Thank you so much

    stephen
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  9. 01-27-2009, 09:09 AM #9
    shg
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    Re: Calculating the distance round an arc

    That was from the second sheet you posted -- it's the length of the chamfer.
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  10. 01-27-2009, 11:03 AM #10
    MickG
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    Re: Calculating the distance round an arc

    Hi, With regards to the first Question :- See the attached
    Mick
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  11. 01-27-2009, 03:45 PM #11
    stephen1000
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    Re: Calculating the distance round an arc

    Quote Originally Posted by MickG View Post
    Hi, With regards to the first Question :- See the attached
    Mick
    Thanks Mick
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