carbon tubing fiberglass tubing manufacturing
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Re: carbon tubing fiberglass tubing manufacturing
: carbon tubing fiberglass tubing manufacturing -- jbike	Post Reply	Top of thread	Engineering Forum

Posted by: lrmccain ® 11/10/2005, 11:46:52 Author Profile eMail author Edit

for tubing that is long and narrow, such as 10ft long by up to 30in dia. you would be well served to make a mold that can expand or contract. For tubing on a smaller scale, / lower ratio of length to dia. you can simply use a spray on or wax mold release, make sure the mold has somewhat satin finish in order to hold the release agent, and cool down the rod in order to press it out. What is the size tubing you are building?

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Re: carbon tubing fiberglass tubing manufacturing
: Re: carbon tubing fiberglass tubing manufacturing -- lrmccain	Post Reply	Top of thread	Engineering Forum

Posted by: jbike ® 11/11/2005, 09:56:10 Author Profile eMail author Edit

The tubing I am building has an ID of 0.75'' and it is 30'' long. How much do you think I need to cool down the rod to get it out? do you think I can do it ?

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Re: carbon tubing fiberglass tubing manufacturing
: Re: carbon tubing fiberglass tubing manufacturing -- jbike	Post Reply	Top of thread	Engineering Forum

Posted by: lrmccain ® 11/11/2005, 15:41:50 Author Profile eMail author Edit

Unfortunatly with something that long, I think that the friction would be to much to remove the rod without damaging the composite. I suggest you get a piece of hollow tubing, aluminum, pvc, etc. anything. you can drill it out after you're done. or if you can make a thin/ lightweight mold that you can leave in place that will also work. If your part can have a taper then I suggest you taper it as was earlier suggested. We've been winding molds only about 6 inches long, and it takes a lot of work to get the metal inserts out as it is, so I think you might not be able to with something that long.

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Re: carbon tubing fiberglass tubing manufacturing
: Re: carbon tubing fiberglass tubing manufacturing -- lrmccain	Post Reply	Top of thread	Engineering Forum

Posted by: jbike ® 11/11/2005, 09:55:41 Author Profile eMail author Edit

The tubing I am building has an ID of 0.75'' and it is 30'' long. How much do you think I need to cool down the rod to get it out? do you think I can do it ?

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Re: carbon tubing fiberglass tubing manufacturing
: carbon tubing fiberglass tubing manufacturing -- jbike	Post Reply	Top of thread	Engineering Forum

Posted by: devitg ® 10/16/2005, 22:52:16 Author Profile eMail author Edit

normally such tube are not cylindrical, they are cone shaped. and if the shape is rectangular or squared they are made by a arrange of pipe tubes to make the core where you will wrap on them, so after wraping you can disassemble the core.

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Re: carbon tubing fiberglass tubing manufacturing
: Re: carbon tubing fiberglass tubing manufacturing -- devitg	Post Reply	Top of thread	Engineering Forum

Posted by: jbike ® 10/18/2005, 01:51:33 Author Profile eMail author Edit

Right now I buy 6' carbon tubing with a true id the entire length (no cone shape). I don't quite understanding your explanation "a arrange of pipe tubes to make the core" maybe you or some one can explain this to me. Am I totally off base thinking I will beadle to remove my core if it is not "cone shaped"

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Re: carbon tubing fiberglass tubing manufacturing
: Re: carbon tubing fiberglass tubing manufacturing -- jbike	Post Reply	Top of thread	Engineering Forum

Posted by: devitg ® 10/18/2005, 06:36:23 Author Profile eMail author Edit

Hi , well that tube was made by a process namend PULLTRUSION is the same as extrusion but the material is PULL from the die. instead been PUSH by the extrusion screw. See here https://www.google.com/search?sourceid=gmail&q=pulltrusion. What do I mention about the core, was a filament winding process.But as your's, is a round shape it does not apply.

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Re: carbon tubing fiberglass tubing manufacturing
: Re: carbon tubing fiberglass tubing manufacturing -- devitg	Post Reply	Top of thread	Engineering Forum

Posted by: rlfry ® 11/05/2005, 11:24:11 Author Profile eMail author Edit

There are 2 methods I know of for making composite tubing. They are both used in High-Power Rocketry. The first addresses the "release" issue with a sheet of thin mylar. That method is here: good luck!

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