Yes, another BTTF2 nike footwear bag build

joshslayton

Well-Known Member
Hello everyone!

https://www.facebook.com/media/set/...073741875.106454076191837&type=1&l=9ddc39a9ce
NOTICE: there seems to be a problem with pictures showing up so ive attached a link to a album with pictures up above

So ive been working this project for a while now and ive noticed a few other builders are making they’re own bag as well like cavx. Whats cool is that everyone seems to have a different and creative way to make the bag and I find that interesting.

So I thought why not share my build and how its going so far.


Progress has been a little slow but thats only because im making it up as i go along. Like usual im trying to make the bag as accurate as possible so with every piece im taking my time and slowly knocking them out


So I started using 12” concrete tubing for the main body. I skinned it with styrene and then reinforced the inside to sturdy it up a bit
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Then I closed up all the opening to get the thing ready for molding. Theres not much to this part, its just there to hold everything eles in place. Once it was ready I made a mold of it and made a epoxy and fiberglass cast.
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So once I got the main body mostly knocked out, i started in the end cone pieced next. This piece to be is the heart of the whole bag. This piece will be design to have the sliding door mechanism. So im very hesitant with this piece as its a very important one so all I did was rough it out of insulation foam and coated in smooth cast. Its looking very ugly right now but im moving in a very slow pace with this one as im still not 100% sure how it will come together.
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So as I put that piece aside I started with the sliding doors. I started with casting a fiberglass skin from the main body mold and cut out the recessed area for the handle. Most of that was made out of sintra. This piece had to be very precise so that when it opens and closes it comes together flush.
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So that’s where the project is at right now. Like I said it’s slow and steady but its coming along very nicely. I will update the thread once i get more progress!




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So since a few people are interested in a bag ill be posting it in the interest thread later today to gather more interested rpfers


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joshslayton Some serious skills in that fibre-glassing.

You clearly know more about glassing that I do. I also initially went with epoxy, but there are several types (casting and laminating) and I ditched it when my parts warped in the heat (we had a heat wave) and why I am now vacuum forming my parts.
 
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@joshslayton Some serious skills in that fibre-glassing.

You clearly know more about glassing that I do. I also initially went with epoxy, but there are several types (casting and laminating) and I ditched it when my parts warped in the heat (we had a heat wave) and why I am now vacuum forming my parts.

Thanks man! Yeah I sometimes have issues with warping from the heat which is why I try to keep them inside with air conditioning. Theres a higher heat resistant laminating epoxy that I might try out soon so maybe that will fix that issue.

I actually prefer vacuum forming over fiberglass for this project but I have the gettoest set up ever and im not the best at it ether


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Last edited by a moderator:
Thanks man! Yeah I sometimes have issues with warping from the heat which is why I try to keep them inside with air conditioning. Theres a higher heat resistant laminating epoxy that I might try out soon so maybe that will fix that issue.

I actually prefer vacuum forming over fiberglass for this project but I have the gettoest set up ever and im not the best at it ether


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I spoke to industry experts about the warping and they all said that I will have to endure that, regardless. It is basically a byproduct of the type of plastic. Because this is precise with moving parts, the last thing I wanted was to have parts warp and you can't open the lids. All it would take is for someone to leave the tube bag in the car on warm day.

I had then thought switching back to smelly polyester resin, but they still said it was due to the thickness of the parts and I would still have these issues as well as further shrinkage due to pouring the end cap in a mold.

And the guy that owns the resin business then sent me off to speak to a vacuum forming expert.

The vacuum forming guy was great to speak to and knows his stuff. But even he said that this is an ambitious project because of the complex shape of the lids.

So make my form work, I have had to reinvent the wheel. It now uses a combination of traditional tools and female tooling. Because I want to use thick plastic, everything that makes vacuum forming a challenge, just increases by a huge amount.

So I needed to create a system that works every time and not have high fail rates like I have seen on traditional vacuum forming systems. Because in the end of the day, the thick plastic is not cheap and I don't want to be throwing out psrts because they didn't pull properly. Based on my tests, this system fixes that problem.

I am just finalising the lid tool now as I had an undercut and I should be ready to make the first parts on Monday. I have had to make the handle part extract so I can get the plastic off the tool as my handle is part of the lid.



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I spoke to industry experts about the warping and they all said that I will have to endure that, regardless. It is basically a byproduct of the type of plastic. Because this is precise with moving parts, the last thing I wanted was to have parts warp and you can't open the lids. All it would take is for someone to leave the tube bag in the car on warm day.

I had then thought switching back to smelly polyester resin, but they still said it was due to the thickness of the parts and I would still have these issues as well as further shrinkage due to pouring the end cap in a mold.

And the guy that owns the resin business then sent me off to speak to a vacuum forming expert.

The vacuum forming guy was great to speak to and knows his stuff. But even he said that this is an ambitious project because of the complex shape of the lids.

So make my form work, I have had to reinvent the wheel. It now uses a combination of traditional tools and female tooling. Because I want to use thick plastic, everything that makes vacuum forming a challenge, just increases by a huge amount.

So I needed to create a system that works every time and not have high fail rates like I have seen on traditional vacuum forming systems. Because in the end of the day, the thick plastic is not cheap and I don't want to be throwing out psrts because they didn't pull properly. Based on my tests, this system fixes that problem.

I am just finalising the lid tool now as I had an undercut and I should be ready to make the first parts on Monday. I have had to make the handle part extract so I can get the plastic off the tool as my handle is part of the lid.



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What can I say man, vacuum forming is an art form but when its done right its smooth as ****. I only know how to form daft punk gloves and helmet visors lol


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What can I say man, vacuum forming is an art form but when its done right its smooth as ****. I only know how to form daft punk gloves and helmet visors lol


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I actually struggle with the thin stuff of less than 2mm. Maybe over heating the plastic, not sure. 3mm is easy. Have not pulled 4.5mm before on this rig, so this will be interesting. I have pulled 4.5 and 6mm Perspex on my smaller test rig.
 
I actually struggle with the thin stuff of less than 2mm. Maybe over heating the plastic, not sure. 3mm is easy. Have not pulled 4.5mm before on this rig, so this will be interesting. I have pulled 4.5 and 6mm Perspex on my smaller test rig.

You got it dude, looking at your build is extensive and the research is wild! I think its really interesting that everyone whos making the bag is doing it in a different way. Like how Im just completely making it up as I go along. So far its going good!


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