Warped Sonotube...fix?

Discussion in 'Archived Threads 2001-2004' started by Jack Gilvey, Aug 26, 2002.

  1. Jack Gilvey

    Jack Gilvey Producer

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    I picked up a 12' section of 16" Sonotube from a local lumberyard today for $20, but the thing is quite distorted with an almost oval cross-section (that's why I got it cheap, it had apparently been laying just where it was for quite some time). I've never had one quite this bad...how do you guys remedy this? Should I bother to try and get it circular, or should I just use a circular brace at the midpoint? It's for a vented Shiva for a friend, and it'll wind up being about 3' long.
     
  2. Dustin B

    Dustin B Producer

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    With that length I'd imagine proper fitting endcaps would straighten it out just fine. My 18" tubing wasn't rigid enough to hold a perfectly circular shape. But even at over 5' in length, as soon as the endcaps went in, it was a perfect rigid circle from top to bottom.
     
  3. Patrick Sun

    Patrick Sun Studio Mogul

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    Stop the presses! Jack's doing a sonosub? Whoa!
     
  4. Jack Gilvey

    Jack Gilvey Producer

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    [​IMG] It's been years since I touched one of these. At this point boxes are pretty easy, but he needs something skinny and tall to fit in a corner behind the RPTV.
    Thanks Dustin, I'll route some endcaps tomorrow and see if that'll suffice.
     
  5. ThomasW

    ThomasW Cinematographer

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    Jack

    Dustin wins the prize!

    Just cut the endcaps to the proper size for the tube and they'll make it round again.
     
  6. Dustin B

    Dustin B Producer

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    Oh and I'm sure you've already thought of this Jack [​IMG] but just incase I'll throw it out there.
    Measure the circumfrence of your tube and use that to calculate the actual inner diameter (accounting for the tubes actual thickness). Kinda tough to get an actual inner diameter any other way from a warped circle.
    PS, Thomas, when will the prize be arriving and what is it? You have my address already or do you need it still :p)
     
  7. ThomasW

    ThomasW Cinematographer

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  8. Jack Gilvey

    Jack Gilvey Producer

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    Thanks, guys. [​IMG]
     
  9. Mike Strassburg

    Mike Strassburg Second Unit

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    Jack,

    You might also want to consider using something like a ratcheting cable/strap to crank it into a round position before putting in the end cap.

    It really helped when I was putting mine together...Mike
     
  10. Neil Joseph

    Neil Joseph Lead Actor

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    Oh come on Jack! Don't you know that if you let it sit the other way for 2 years, it will become a circle again?
     
  11. Brian Fellmeth

    Brian Fellmeth Supporting Actor

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    Jack,

    Another trick that might help is to rout a chamber around the edge of the inner endcap to taper it so it may help round the tube as you force it in.
     
  12. Jack Gilvey

    Jack Gilvey Producer

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    Thanks again, guys. I'm going to try Neil's suggestion first, I'll keep you posted.
     

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