Open Source Carbon Fiber Attachments + Strength Testing
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- Опубликовано: 15 окт 2024
- Here are links to some of the parts used in the video:
8mmODx6mmID Carbon Fiber Tubes - amzn.to/2J5xVqz
Thrust Bearings: amzn.to/2FtDP1u
5x10x4mm Bearings: amzn.to/2CiXCxD
Weight Scale: amzn.to/2DlTaQl
Super Glue: amzn.to/2S2Lw5L
Epoxy: amzn.to/2RUn725
12mmx10mm Carbon Fiber Rod: amzn.to/2W1NdiO
Well Nuts for 12x10 Rod: amzn.to/2W1fLsV
Parallel Face Pliers: amzn.to/2Cs3S6a
Locking Pliers: amzn.to/2MiZ7jQ
Quadcopter Attachments: amzn.to/2CuH3i9
Dynamixel MX-12W Servos: amzn.to/2M6xLgK
OpenCM Controller: amzn.to/2FugJI3
Link to Attachment Models: github.com/Pro...
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Your commitment to the cause is commendable.
Thanks Aaron!
@@ProtoG42 I would have stopped at 20lbs and said - you don't need more than that haha
Here are links to some of the parts used in the video:
8mmODx6mmID Carbon Fiber Tubes - amzn.to/2J5xVqz
Thrust Bearings: amzn.to/2FtDP1u
5x10x4mm Bearings: amzn.to/2CiXCxD
Weight Scale: amzn.to/2DlTaQl
Super Glue: amzn.to/2S2Lw5L
Epoxy: amzn.to/2RUn725
12mmx10mm Carbon Fiber Rod: amzn.to/2W1NdiO
Well Nuts for 12x10 Rod: amzn.to/2W1fLsV
Parallel Face Pliers: amzn.to/2Cs3S6a
Locking Pliers: amzn.to/2MiZ7jQ
Quadcopter Attachments: amzn.to/2CuH3i9
Dynamixel MX-12W Servos: amzn.to/2M6xLgK
OpenCM Controller: amzn.to/2FugJI3
Link to Attachment Models: github.com/ProtoG/CarbonFiberAttachments
Carbon fiber arrow heads use a high temp hot melt glue to hold semi-barbed threaded inserts in. This forms a surprisingly high strength bond. It may not work as well for your inserts through because you are using a square profile and have less surface area contact with the shaft.
if you add grooves/undercuts/reverse tapers to components, they will be positively "keyed" once the glue solidifies. Less reliance on pure adhesion.
Super glue is used to fill chips in carbon fiber propeller blades in helicopters. The put a dab of super glue and then sprinkle baking soda which cause super glue to harden instantly and also adheres 10x stronger. They continue this process until the chip is filled then sand flat.
Exactly what I needed, thank you
Thanks. There's not a lot out there for carbon fiber connectors when it seems like there should be a lot more options.
Any ideas for thinner tubes? Some sort of external sheath for 4mm tubes?
Did you do any surface prep to the inside of the carbon tubes? I wonder if the epoxy would hold better if the inside of the tube was scuffed up some? I know that makes it less ideal for quick assembly since it adds a step but it might make for a stronger bond.
I didn't but I'm sure it would make it stronger if needed but 60-70lbs should be plenty sufficient for most application. I'm happy the CA glue worked so well because it sets up much quicker and I don't need to mix two part epoxy so that's a win win for me.
I take it from the burrs shown on the aluminum components that you machined the OD profiles? so then how did you make the tubing clearance slots ? also machining? One other note... the glue in all of the demonstrations is way stronger than a 3D printed part would be. I like the aluminum but access to accurate machining could be a problem. Keep up the good work. Always interesting to see what you've done.
Thanks! I laser cut the aluminum parts. Check back at some of my laser cutting videos to see that machine. They would not be as strong, but 3d printed parts would be plenty strong for most hobby projects. Laser cutting out of plastic like acrylic or something similar would work pretty well too.
well lasercutting aluminium produces a sizable burr since the aluminium has the tendency to melt before ablating since its more reflective. the burs come off easily though.
Super glue is pretty brittle. Any concerns with it coming lose over time due to vibration?
It depends on the application but for most things I would not be worried at all about that in this scenario. Brittle is not necessarily a bad thing here. Concrete is brittle but works great when used in combination with other materials with complimentary properties like steel. Since the attachment is already a tight press fit, the CA glue is not really being used as an adhesive here as much as it is a filler material for a "perfect press fit" with great friction properties. If I were doing something critical like hanging babies from it all day long I would drill a hole straight through the epoxy version after curing and press in a spring pin.
Very impressive. How tight of press fit are you using for the bearings? Straight of the laser? or milled/ drilled afterwards?
Thanks David! Those were 10mm OD bearings and I just used a 10mm hole straight off the laser without any issues. I figured if I had to, I would ream or mill them but it ended up fine.
@@ProtoG42 BTW we may actually use this on our robot this year!
@@DavidGuzman-yb7xi Awesome! Let me know and I'll personally make a few linkages for you to test.
I'm impressed that you didn't pull the shelf off the wall...
Me too! I had to lean against the rack to keep it from tipping. Next time I'll have to make a setup for pulling straight down with bodyweight.
i watched your video, quite well, done, and visited your instructables, whatdid not find is how you would have attached those carbon tubes to the motor you have in this video, care to share that ???
Did you make the wire-frame work benches yourself, or did you source them from somewhere? That's a great idea.
Thanks! I used two full racks in the back and 2 half racks in the front. I connected them all together with several zip ties and a few bolts. You can buy them on Amazon here: amzn.to/2RuGv5k
Nice bench/shelves, what is the model/brand? thank you
Thanks! I used two full racks in the back and 2 half racks in the front. I connected them all together with several zip ties and a few bolts. You can buy them on Amazon here: amzn.to/2RuGv5k
😂😂😂😂 You lost me at "pull-out-strength"
Super glue almost becomes a part of carbon fibre I've seen this myself.
the stepper motor mount only has a flat in the hole so how does it stay attached? how does it clamp?
Soooo when are you going to build a butter passing robot?
I´ll bet you get better results with another brand of epoxy. A 24h Epoxy should beat any super glue every day, all day. Try something like West Systems or any other industrial brand. In my experiance the failing part would be the carbon fiber tube in this experiment(if prepared correctly).
Next video: How to prevent galvanic corrosion in carbon composites
Cool
You need a couple of tests to get any meaningful data, I think the min is like 4 for the test to be statistically meaningful
I'm not doing any groundbreaking research, just giving people a rough idea of how strong the attachments are.
When you say "3D print", you can't mean PLA !! Can you ??