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Step 7: Making telescoping paper tube sleeves

I often need to make telescoping tubes that slide nicely in and out of each other. For this, I have made special forms that produce tubes just a hair bigger than what come off of my plain tube forms. 

A sleeve-making form needs to be built up by gluing layers of kraft paper directly a plain form. I glue onto the new form however many number of layers I use to make tubes on the original form, plus one. This generally means four layers, and this has worked out well to produce tubes just bigger than the ones that come off of the original forms.

Sometimes I already have an existing tube that I'm going to use for something, like a mailing tube, and I need to just make a sleeve that fits over it. In this case, I'll cut off a section of the tube to create a form, and glue on one layer of kraft paper. This new form will produce tubes that work as sleeves for the original tube. 

There is a bit of shrinkage that occurs, so don't fret if tubes and sleeves don't fit at first. Let them dry fully, and if things still don't fit, you can either add another layer to the form and try again, or add an additional layer to the smaller tube so it fits better in the sleeve.

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<p>Back when I made model rockets, I used to make most of my own engine mounts and tube adapters (by the methods you describe) because the local hobby stores wanted too much for my budget (very low). I probably still have some 25-year-old parts kicking around.</p>
<p>Very cool! It's a great hobby. I find myself returning to it every few years and making a few rockets. My kids are now old enough that they can actually make some themselves. Pretty fun stuff.</p><p>Thanks for the comment! Just saw your clamps instructable. That is a really good write up, I quite enjoyed it.</p>
<p>This is a very precise tutorial. Nice job. I am wondering if you have tried the 'dry glue' method as outlined in <a href="https://www.apogeerockets.com/education/downloads/Newsletter330.pdf" rel="nofollow">How To Make Your Own Body Tubes - Apogee Rockets</a>.</p><p>They use a hot iron on paper that has dried glue on it, in oder to avoid warping. I am thinking of trying it using a heat gun. They are making convolute-wound tubes but it should work for spiral-wound as well.</p><p>There is also <a href="https://www.apogeerockets.com/education/downloads/Newsletter304.pdf" rel="nofollow">The Mathematics of Spiral Wound Body Tubes - Apogee Rockets</a>, which shows how to precisely calculate the pre-cut lengths of each layer for spiral-winding.</p><br><br><br><br><br><br><br><br>
<p>Thank you!</p><p>I hadn't ever seen these instructions from the apogee site, but they look really useful. I just kind of made my methods up, so some of the things I did might not be the best approach in reality. </p><p>I appreciate you sharing the links, and I'll have to take some time to read through those more thoroughly. I haven't made a rocket tube for several years... too many projects!! </p>
<p>As a model rocket enthusiast, and rocket scientist, I am always looking for ways to make my rockets without having to spend hundreds of dollars on specific company tubes. This tutorial is quite revealing. I do have a few questions though. When you put a lay-up on your form, do you crisscross the layers, or put them on in the same direction? Aerospace applications tend to use a crisscross pattern for strength. Also, about how long does a form take to dry? Finally, how do you cut your motor centering rings?</p>
<p>Hi!</p><p>Criss-crossing layers never worked for me, as it tended to cause the earlier layer to "unravel," basically. Going the same direction keeps the layers tight. </p><p>I think the forms took about a day or so to dry. But it depends on so many factors (size, amount of glue used, local temperature and humidity, etc.).</p><p>For motor centering rings, it depends on what material I used. If I used cardboard or paper based products, I usually just use an x-acto blade. If I used thin plywood, I use a scroll saw.</p><p>Hope that helps! :)</p>
<p>It does. I tried your process and it worked. I finally read the remainder of the comments, and followed the advice of Dream Dragon; I want the motor mounts to be strong. Currently though the kraft paper I have found was quite thin. Rolling up took 4 sheets, 18&quot;x8&quot; along the 8&quot; edge for an 18&quot; roll-up on a 1/2&quot; form. So I ended up with about 42 layers of thin paper and glue. It's about 100F in my garage, but humidity is around 50%. So I expect the roll-up to take about 3-4 days. That said, using an x-acto knife to cut 1/4&quot; rings, how do you do that through 42 layers of glue and fibers (paper)? The Apogee folks do this for thinner thickness tubes, but a thickness of about 1/8&quot; is not simple.</p><p>Your suggestion to tape down the ends worked very well, better than I thought. On a different note, did you ever consider 3D printing of the centering rings?</p>
<p>You lost me on the motor mounts question. Are you cutting through the side wall of the tube (is that what is 42 layers)? Or are you talking about cutting centering rings? Maybe upload a photo of what you're working, and I can respond more specifically.</p><p>But depending on what you're trying to cut, if you're trying to cut through that much paper I'd treat it like wood and cut it with power tools, say, like a dremel or a scroll saw.</p><p>I've never considered 3D printing, but if you have access that could be a good option.</p>
Thank you!!! This totally just saved my 9yo's cosplay. We found out he can't take his small diameter dowel staff in, but I CAN use it as a form for this. He's now super excited instead of being super bummed.
<p>Cool! I hope it works out for you guys. Good luck!</p>
<p>Have you tried alternating the layers in oposite directions and if so, did it make any noticable difference?</p>
<p>I just saw your post far below stating how it didn't work very well when you alternated direction. Is there a reason you don't let each layer dry before proceeding with the next?</p>
Yes. The reason is that the paper shrinks substantially when it dries. If you don't take the tube off of the form immediately once you've added the last layer, it will dry so tightly onto the form that the only way to get it off is to cut it off. <br /><br />So you have to add all the layers in one shot, and then take the finished (but not fully dry) tube off the form and let it dry.<br />
<p>Hey,would brown paper work????</p><p>as in:</p><p>http://www.ebay.in/itm/Brown-Paper-Envelopes-Size-12-x-10-A-Pack-of-50-Envelopes-/262021507810?hash=item3d01b2eae2</p>
<p>This is awesome! I'm building air rockets with my kids and I just <br>finished wrapping my first tubes. How long do you typically wait for the <br> tubes to dry?</p>
<p>You're building air rockets with this kind of tube? What kind of air rockets?</p><p>This type of tube seems like a lot of extra work if their going to be anything like <a href="http://www.instructables.com/id/Paper-Stomp-Rockets-Easy-and-Fun/" target="_blank">these.</a> So you've definitely piqued my interest!</p><p>Regarding drying times, I live in a pretty arid place and a three-layered tube would usually be fully dry within a day. Just be sure to remove them from the forms (or move them to a smaller one) because they will shrink quite a bit.</p>
<p>These are higher power compressed air rockets. We're working on my oldest son's science fair project doing a bit of accelerometer data logging. We're having a lot of fun with it- I built lots of rockets as a kid so it's bringing back lots of great memories for me.</p><p> The larger tube in the picture is a little bit smaller than a BT-50 tube as it's wrapped around a 3/4&quot; PVC tube- it's about 23mm OD. I pulled the tubes off the forms last night and let them dry standing up and they're perfect now- I did three layers. Of course now I want to make my own light weight fiberglass tubes- LOL! :)</p>
<p>Awesome!</p><p>I've been getting back into model rocketry with my boys for the last few months, and it's been quite fun. I'm glad you found this and am happy to hear it worked out for you! </p><p>I'd love to see some pics when you're all done... or will there be a full instructable write-up? :)</p>
<p>There will of course be a full write up! :)</p>
<p>I would expect nothing less! Can't wait to see it.</p>
<p>Launched the air rockets today- man do they really go! My boys were super excited and several kids came up to us at the launch site and wanted to check them out. They couldn't believe they were air powered. The first launch we got readings that nearly maxed out the accelerometer at 15.73 g. </p>
<p>Very cool! Did you incorporate some kind of recovery system? I'm getting a bit excited to see all the details on this!</p>
<p>Here you go- <a href="http://www.instructables.com/id/Science-Fair-Air-Rockets/" rel="nofollow"> http://www.instructables.com/id/Science-Fair-Air-...</a></p><p>Enjoy! Still working on the video- YouTube is having some trouble...</p>
<p>Gravity was the only recovery system- there were a few casualties- LOL! We launched the first one at 60psi and that was too much as the nose cone collapsed into the tube on landing and damaged our datalogger circuit and tore a hole in the side of the rocket. We were able to repair everything and launch again the same day. We got maybe seven launches before the tube finally buckled. It was awesome. I should have the complete write up with video done this weekend. :)</p>
<p>so the length and width of the paper strips will work with a 3 inch wide and 18 inch long tube also </p>
<p>Quite impressive! The results look to be of commercial quality!</p>
<p>I bought &quot;kraft&quot; paper off amazon, but it doesn't look as thick as yours. More like waxy, butcher paper. Darn. Should have went to Home Depot like you.</p>
Do you think I could use a mailing tube like http://staples.com/touch/product.html?sk_test=a#468355<br>Or would they be too heavy to be used for a rocket?
<p>I've never used them for rockets, but I suppose it could be done. They are built to be durable, so they are pretty heavy though.</p>
I was using elmers glue. They were pretty thin coats too. Are there any other methods you know of to make rocket body tubes?
<p>Sorry, not that I'm familiar with. You can always just buy tubes, which isn't a bad idea considering the time and trouble it is to make your own. </p><p>I'm just kind of a maker-masochist, and I enjoy headache-inducing creative processes . . . but understandably that's not for everyone. </p><p>If you do end up purchasing some tubes, I've gotten lots of supplies from apogee components, and have been really happy with their stuff. </p>
I'm trying to make this for the gopro rocket (3 inch diameter) and the paper just gets soggy and wrinkly. Any tips?
<p>Hmm. What kind of glue are you using, and what kind of paper?</p><p>The paper does tend to get a little wrinkly and soggy, but not so much that it falls apart. Make sure you're not using too much glue. There should only be a very thin, uniform layer.</p><p>If you continue to have trouble, post a photo or two of what you're experiencing, and maybe I can offer some more specific advice. :)</p><p>I should also point out, this is not a super easy method and it can be quite frustrating. So I completely understand any struggles you may be having with it. </p>
Tks for the info... I needed to make some of them!
I have found that when cutting off of tubes, a large, very sharp knife makes the straightest lines. I usually use the largest straight-blade kitchen knife to cut straight on tubes, rolling the work as I use my weight to cut into the material.
Thank you. Very well done. I have wondered how to make this tubes. Awesome job.
great post. Thank you. <br> <br>Do you think it would be possible to make a very large diameter tube without a complete form? <br> <br>For instance using a narrow tube and moving it inside, as you wind from the bottom?
I don't think that would be possible. It's a tedious process with iffy results of you're not very careful as is. I think trying something like you suggest would be incredibly frustrating, and just plain not work. Sorry!
Do you think these could be used to make this project? <br> <br>http://www.instructables.com/id/Tube-Light/
Ah, probably not. These tubes I make are a lot more work than it would be worth for a project like the tube light. For the tube light, I would just use mailing tubes or something similar. It would save you a lot of time and hassle.
When making your own rockets, do you make your own nosecones as well? If you do, how do you do it?
I have, yes. Although I don't have it down to a science, like I do for the tubes. I've used homemade paper cones, plastic easter eggs, carved balsa or foam, and a number of other things. To be honest, it's a weak spot in my homemade designs.
Thanks for the quick response! I've been looking everywhere for a method that allows me to make any size nosecone, but can't seem to find any. I would definitely use carved balsa if I had a lathe.
Nice work. However as a professional pyrotechnician, I'd have some doubts about a &quot;spiral wound tube as a motor housing, or in a lot of other applications. I would usually recommend a straight wrap, especially for anything which may have to hold back the kind of pressures that might develop if things go wrong.<br><br>I know it's done, and as long as things work as they should, you can get away with it.<br><br>Alternating Direction is a good thought, but will indeed tend to loosen the layer underneath.<br><br>Paper does have grain, but it's not quite like wood. The issue here is more about the seams than the paper itself.<br><br>Please don't think I'm trying to rain on your parade, those tubes are very good and they do look very useful. Your Instructable is well documented and nicely presented.<br><br>I know Fireworks can be fun, and god knows how frustrated I am at the Laws here in the UK that prevent a lot of fun experimentation even by professionals like me.<br><br>Have fun, but do stay safe folks.
Thank you for your words. I've never done any work with fireworks, so I'll take your advice there. As far as using spiral-wound tubes for rocket motors mounts, I should have noted that I've only ever worked with relatively small-scale Estes rocket motors. So for those, at least, these homemade motor mount tubes have always been adequate. They are very similar in beefiness to kraft paper tubes that are available for purchase for the same applications--<a href="http://www.apogeerockets.com/body_tubes.asp" rel="nofollow">like these</a>.<br> <br> For pyrotechnic devices or larger scale rockets, you are most certainly correct about using a stronger straight-wrap technique.
Do you ever alternate the direction of the spiral for greater strength?
I tried alternating the direction of the second layer one time, but as I wrapped it on it seemed to loosen up the first layer that had initially been tight on the form. <br><br>It does seem logical that doing so would make the tube stronger, kind of like how plywood is made, but it didn't seem to work very well.
Yeah, and on second thought, since there is no grain to paper, it probably wouldn't make as much difference as with wood.
Awesome! Super informative but easy to follow directions. The egg nog bit made me laugh too. Can't wait to make some tubes.

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