O-rings - What size?

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  • himszy
    Junior Member
    • Nov 2004
    • 282
    #1

    O-rings - What size?

    Hi,

    I'm building my own wtc, regarding the o-rings, do I get a size that perfectly fits my lexan tube or one slighty larger.

    Thanks Michael
    Tags: None
    • Guest
      #2
      Depends on how you are

      Depends on how you are mounting the O-rings.

      If they are sealing the inside of the cylinder wall, then you want a small interference fit between the o-ring and cylinder wall. This will vary depending on the tubing you are using.

      If you are butting the o-ring against the edge of the cylinder, then you want to make the o-ring diameter the same as the external diameter of the tube.

      Use a good quality silicone grease with the o-rings. I use the Servisol brand, which you can purchase from Maplin electronics.

      Andy

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        • bradv
          Junior Member
          • Jan 2004
          • 129
          #3
          Not knowing much about O-rings,

          Not knowing much about O-rings, could a strip of rubber (eg. from a bicycle inner tube) be used instead if the end-cap is correctly sized for it? This would give a nice, wide seal (ie. the thickness of the inner end-cap) but I'm not sure if this is good or bad!

          I'm also about to build my first cylindrical WTC and have appreciated all the helpful posts I've seen regarding this in the past.

            Comment

            • Guest
              #4
              You could use a strip

              You could use a strip as you mention, but O-rings are much better, and you'll only be saving pennies.

              It's not the cross section of the seal that counts- it's the accuracy. Make sure all your sealing surfaces are smooth and flat.

              Andy

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                • m. munger
                  SubCommittee Member
                  • Feb 2003
                  • 72
                  #5
                  Ah, orings.... for almost every

                  Ah, orings.... for almost every technical aspect and design criteria for orings, check out]eFunda Oring Design guidelines[/url]

                  That SHOULD answer any question you might have about orings, and perhaps might generate a few more!!

                  Good luck

                  Matt

                    Comment

                    • tmsmalley
                      SubCommittee Member
                      • Feb 2003
                      • 2376
                      #6
                      http://www.rc-submarines.com/1abfa9d0.jpg

                      Just remember to keep it



                      Just remember to keep it simple. Unless you have some sub experience under your belt - go with a proven method.
                      There are a number of WTC designs that have been proven to work and keep your electronics dry.

                      I have some photos of a WTC built by FORMER SC membership chairman Jim Butt on my website that uses a flat gasket but it's not inner tubing. Inner tube is too hard and irregular to give a reliable seal.

                      See Jim's WTC instructions at ]www.rc-submarines.com - how do you keep the water out?[/url]



                      Edited By TMSmalley on 1104775056

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