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Homemade Visco fuse machine ! Almost done !


Svimmer

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Made a really small visco fuse machine!


got pretty suprised about the size when i printed out the templates.

Still need some work to make it run really good. Next thing i need to get done is bearings.

Once everything runs smooth it would be fun to add a engine to it.



Edited by Sondre
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Nice job, cant beat a bit of birch ply ;) I`d create bearing housings in the mounts with a forstener bit and press the bearings in, wont take more than 5 minutes.

Edited by Col
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Nice job, cant beat a bit of birch ply ;)

Thanks just got done with the collector

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I like the use of a single belt to drive the separate plates in opposite directions. Very clever, looking forward to how it works in the end
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I tested with some powder and it flows good until it get stuck. it might be because the powder is not 100% dry because i just cleaned the ballmill before i made the powder and it did clump in the mill so if it dosen't help to dry it then i need to granulate it. If that dosen't work then i have a problem.

 

Edit: After granulating it flows really good

Edited by Svimmer
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Kosanke wrote an article on defective fuse, and found that small changes in the mesh size of the granulated powder strongly affected burn rate.

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First fuse made with the machine !


There is still some stuff i need to fix with the machine. i did put on som bearings i had but they where really bad so the plates is not straight anymore. so need to get new ones. and the bobbins jump off easy because the plates are not straight anymore. also the thread i had is not cotton. i have ordered bearings and thread now.

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..and/or use a slower burning formula. It was also changing burn rate along the way a bit. If you look at the fuse in your previous post the weaving is a bit uneven along the way giving different level of containment. I'm guessing that the fuse is not pulled through at a constant rate relative to the spinning disks, but a bit faster and slower here and there due to the rubber band belt. Maybe you can swap the rubber band for something stiffer that doesn't stretch?
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..and/or use a slower burning formula. It was also changing burn rate along the way a bit. If you look at the fuse in your previous post the weaving is a bit uneven along the way giving different level of containment. I'm guessing that the fuse is not pulled through at a constant rate relative to the spinning disks, but a bit faster and slower here and there due to the rubber band belt. Maybe you can swap the rubber band for something stiffer that doesn't stretch?

It is not a rubberband. it dosent stretch. the reason for the uneven weaving was because of 2 of the threads jumped off so i just cut them off just to test the fuse. im going to fix few things and il do and update.

Edited by Svimmer
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..and/or use a slower burning formula. It was also changing burn rate along the way a bit. If you look at the fuse in your previous post the weaving is a bit uneven along the way giving different level of containment. I'm guessing that the fuse is not pulled through at a constant rate relative to the spinning disks, but a bit faster and slower here and there due to the rubber band belt. Maybe you can swap the rubber band for something stiffer that doesn't stretch?

Oh are you talking about the collector ?

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Yep, that's the one that determines the pull through rate.

i can try with more rubber bands until i get a better fix for it.

 

http://bldr.no/BYM This fuse is also done with rubberbands.

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Also, and perhaps a more important factor to the uneven weaving, a wrong speed of the second disc. Looking at the fuse, you see that the second layer has a pattern to it, with about a third "empty" and two thirds "filled". That indicates to me that you need to change the sizes around on the second disc such that it spins ~50% faster.
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Or use a 50% thicker thread! This is why I'm going for the stepper solution in my design so I can avoid the labour of mechanically changing it depending on thread size and the tuning necessary.
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i can try with more rubber bands until i get a better fix for it.

 

http://bldr.no/BYM This fuse is also done with rubberbands.

 

Yes, looks pretty nice, although if you zoom in on the picture there is the same problem with a pattern of denser and less dense areas along the length of fuse. Most likely this pattern is not caused by the stretching of the rubber band but rather a mismatch of disc speed versus pull through rate. I think the guy that made this fuse also needs to speed up the second disc somewhat.

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Or use a 50% thicker thread! This is why I'm going for the stepper solution in my design so I can avoid the labour of mechanically changing it depending on thread size and the tuning necessary.

 

Could it be that im using polyester thread ? cotton is softer and will be weavin nice or im wrong ?

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