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Thread: Helical plate bending

  1. #1
    Associate Engineer
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    Helical plate bending

    Hi everyone, I have a question for you :

    I want to bend an helical plate so that I have a pitch of 8 inches. One end of the plate is going to be fixed and we will bend the other end. How can I know the amount of pressure needed to bend the plate for my need ? Is there a formula for this ?


    This is a picture of the helical plate I want to make.
    Anybody can help me ?

    Martin Truchon

    P.S: Sorry for my english, I'm french
    Attached Images Attached Images

  2. #2
    Lead Engineer
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    For some help you might do a web search for "flat helical spring design" to find formulas for the the force and stress vs. deflection of that type of spring and then determine the force required to achieve/exceed the tensile stress of your plate material.

  3. #3
    Associate Engineer
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    Already did my research on the internet but I found nothing ....

  4. #4
    Lead Engineer
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    I did some looking and was surprised how little I could find (at one time I had a very good reference for this but I no longer have that document) what I did find is the below military document which (while of poor print quality) describes how to design edge wound flat coil springs which is representative of your problem. Goggle the complete below web search address from the front including the three dots ...


    ... 10 Variation of final stress for springs coiled on flat and initial load P1 required
    versus precompression ... D - mean coil diameter N - number of coils ...

    and click on the first selection titled Design of Helical Compression Springs

    PS I know this is a strange web search address to enter but, trust me, it will work
    Last edited by JAlberts; 07-08-2016 at 05:24 PM.

  5. #5
    Project Engineer
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    Quote Originally Posted by Martin T View Post
    Hi everyone, I have a question for you :

    I want to bend an helical plate so that I have a pitch of 8 inches. One end of the plate is going to be fixed and we will bend the other end. How can I know the amount of pressure needed to bend the plate for my need ? Is there a formula for this ?


    This is a picture of the helical plate I want to make.
    Anybody can help me ?

    Martin Truchon

    P.S: Sorry for my english, I'm french
    Your searches might be more successful looking for how to make auger flights. There is a lot to look at but I didn't see anything about pressures. However you might get some ideas for another method.

  6. #6
    Administrator Kelly Bramble's Avatar
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    Here's a video of a machine manufacturing a spring washer.. Following the forming operation heat treating to the desired condition is done.

    Spring Washer Machine
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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