ฝัง
- เผยแพร่เมื่อ 23 พ.ย. 2020
- When designing mechanisms for 3D printing, at times I model then 3D print a variety of test mechanisms before proceeding with the final design (and our grandkids confiscate my tests for school projects so they don't go to waste!), which is one of the great aspects of additive 3D printing (you should have seen the waste from my CNC milling projects...). I learn from making mistakes, and as such I've learned a lot in my 65 years.
Anyway, the first reason for this video was to provide a visualization of the three generations of a linked chain mechanism I've been working on for an upcoming design. My goal was to design and 3D print my final design of this model in the smallest space possible while maintaining tolerances and smoothness of operation for reduced current draw, and each generation was a test of reduced size (and as such mass) and tighter tolerances.
And the second, and perhaps most important, reason for this video was to answer an exquisite question from one of my TH-cam followers "GrandadsOtherChannel" (th-cam.com/channels/2mp.html..., yes it does...
And finally, just because my first design did not work as I expected, as my parents told me, never give up, and neither should you!
Designed using Autodesk Fusion 360, sliced using Ultimaker Cura 4.8.0, and 3D printed in PLA on Ultimaker S5s. - วิทยาศาสตร์และเทคโนโลยี
Marvelous! I was looking for a kind of "telescopic" actuator and with your video I've learned about the rigid chain concept, many thanks!
Hi Marcus,
Great, I'm glad you found a solution to your design!
Greg
Haha, brilliant, and thanks for the mention too. I still don't know how you get these printed so quickly. I guess you have more than one printer or yours prints 10 times faster than my cheap Ender 3D
You're welcome GrandadsOtherChannel, I just couldn't let your question remain unanswered without a video!
I do have more than one printer (actually three) and they do print fast and accurate.
Greg
@@popzct just simple things like changing the filament for different colours in your prints tells me you are probably using more than one printer. If I change from black to anything else I always get the odd bit of black find it's way into the new print 😁
@@GrandadIsAnOldMan try running wet filament through to clean black out?
This is a beautiful mechanism!
Thank you very much, I truly appreciate it!
Greg
ou seem to have invented pushable rope.
Just a linked chain mechanism .
Nice, can you please upload this to Thingiverse, I would love to print it!
Hi STORM 09,
I will be uploading files soon, but not to Thingiverse.
@noam lima Fusion 360.
Awesome, what are the differences(on a technical level) between the generations? Why are they smoother running?
Hi Bror,
The first generation was large, heavy, and the tolerances were too loose in some areas, and too tight in others. I also had to file each individual chain link to remove the build plate "ooze".
The second generation was smaller and lighter, with slightly better tolerances and chamfers on the build plate side of the chains to reduce (actually eliminated) filing.
The third generation was the same size as the second, but the tolerances (.4mm) between the chain links, chain pins and chain pin holes worked very well. Also, a .4mm chamfer was added to all edges of the chain links to allow smoother operation as the chain rolls over the sprockets.
Hope this helps!
Greg
Great! Interesting mechanism. I have surprised that I had seen this mechanism somewhere a long time ago. In my memory, it was a product brochure that two chained gears are joining as a linear mechanism just like your design. I googled but cannot find the product, and found the US Patent 7270619 showing the same concepts. I guess you are a genius to design this kind of mechanism by yourself!! Hopefully, you may share your final design so that I can print it. Thanks.
Thank you very much, I'm glad you enjoyed it!
Greg
Serapid makes an industrial version
Time to get a resin printer and make one the size of the quarter that still works !
HI John!
I'm too old for those chemicals!
Our local FabLab has one, so I might talk them into attempting this model.
Greg
Nice, can you share STLs?
www.instructables.com/A-3D-Printed-Snake-Automaton/
using three chains and connecting them with a triangle you will get a rigid structure
Interesting idea!
Greg
@@popzct another hint. use the principle of a measuring tape with a spring. holes in the tape for the gear teeth.
You could also use four chains, if you want to use right angles.
Could be a cable chain with no lag if it got hollowed out
Is it possible to store that zips in spiral form? (5-10 revolutions)
Yes.
I'm wondering if there's a practical use for something like this.
You could use it as a tape measure
There are a ton of uses. en.wikipedia.org/wiki/Rigid_chain_actuator
You could probably use this to make an Automatic Tank Loader!
Ok.
Could you make a door out of this concept?
Yes.
@@popzct I think that would be one cool door then!
Is there a chance you can share the fusion 360 file?
I'm not even certain I have these files anymore, but usually, unless I'm publishing a tutorial, I do not provide .f3d files.
Greg
Interesting for a bike lock needs redesigning tho ....what ya gonna use that for kids toy 😂
That's been copied look like a VHS tape lmfao
I designed this for my grandkids.
Greg
@@popzct very clever 👍