Math formula to lay out bevel angle
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  1. #1

    Math formula to lay out bevel angle

    Hello.
    I've been struggling with this for a while... Never been able to figure it out. No help online... I know there is a way just not sure how...

    So given a specific wall thickness how far back do you have to measure, then wrap and grind to set line to get a specific bevel angle?

    Example: 1/2" wall... Measure 1/2" back (on square pipe) to get a 45 degree bevel...

    What about 37.5? 30? 5/8 wall... Etc etc...

    Yes I know there are gauges, eye it... But I want a good starting point for random pipe sizes.

    I know there is a formula where you can plug in wall thickness, then the bevel angle and get a measurement on how far back to measure to get said angle....

    Just not sure what it is...

  2. #2
    Join Date
    Jan 2011
    Location
    W. Wisc
    Posts
    388

    Re: Math formula to lay out bevel angle

    Depends which way you want to define the bevel. It's basic trigonometry. Attached.

    Name:  trig101.jpg
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Size:  37.9 KB
    -Dave
    XMT304, 22A Feeder

  3. #3
    Join Date
    Oct 2019
    Location
    Australia
    Posts
    26

    Re: Math formula to lay out bevel angle

    Forget about it. Nobody does it that way. Cut yourself a gauge out of a scrap piece of sheet metal. Get used to standing and holding your grinder or torch the same way. Grind 1/2" of bevel, check with the gauge and adjust. Then hold the same angle as you go. Keep checking and adjusting. Keep doing it and eventually it becomes muscle memory and you don't need the gauge.

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