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- novelchip commented on novelchip's instructable Easy Rubber Machining With a Needle
- novelchip followed tools, paper-airplanes, gadgets, metalworking and 37 others channel
- novelchip commented on Matlek's instructable 3in1 SunglassesView Instructable »
Wow ! Great work!
- novelchip commented on ossum's instructable Giant Skeleton Minifig (10X Scale!)View Instructable »
Gigantic!
- novelchip commented on azreen's instructable INVADER 31View Instructable »
well done !
- novelchip commented on MakeHaven's instructable Casting CoastersView Instructable »
great finish ! Nice work.
- novelchip commented on novelchip's instructable Easy Rubber Machining With a Needle
- novelchip's instructable Easy Rubber Machining With a Needle's weekly stats:
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- novelchip commented on novelchip's instructable Easy Rubber Machining With a Needle
Thank you ! I will probably also try a chuck from an old PCB drill that I have lying around since it appears to rotate nicely centered
Thanks a lot for your insightful appreciation ! Yes, PVC rubber cuts quite well also and indeed I am planing to use precisely PVC rubber sheets + commercial precast silicone rubber sheets to make microfluidic devices. This simple trick indeed allows such easy and really ultrarapid complete prototyping of silicone microfluidic circuits that I still can't believe it allmost.
Its ordinary milling work..the needle spins (e.g 16000 rpm) and advances along the toolpath at some 100-200 mm/min. The material is engraved one by engraving deeper and deeper in each pass. I usually set the depth increase between passes around 0.1 to 0.2 mm or in some cases 0.05 mm even though it slows down the work process. Admittedly it is not as fast as cutting with a knife but compared to mold preparation and casting it is hundred of times faster
View Instructable »You can also build one yourself at low cost if you feel the courage. There are lots of instructables about it. I did build small 2 versions before buying my present bigger machine. In any case CNC is very useful and fun as well
- novelchip commented on novelchip's instructable Pulsing Fluidic Heart MicropumpView Instructable »
I'm glad I have suggested you an idea. Good luck !
- novelchip made the instructable Easy Rubber Machining With a NeedleView Instructable »
Here are some cross sections made on the fly with a Dino Lite USB microscope. Not good quality admittedly. In the top view image the cross is the cut and the reference my hair which i measured to be 60 microns thick. I nthe two cross sections at increasing magnification there does not seem to be any undercut, nor any flap of material on top. I got annoying "flaps" and undercut when using a normal endmill but with a needle not at all. This was one of the first advantages that I noticed and why I am so happy to have discovered the needle
- novelchip commented on novelchip's instructable Pulsing Fluidic Heart MicropumpView Instructable »
Fascinating proposal ! Indeed I found that what you are talking about exists as Stirling engine
- novelchip commented on novelchip's instructable Easy Rubber Machining With a NeedleView Instructable »
you can buy them also on e-bay or amazon
- novelchip commented on novelchip's instructable Easy Rubber Machining With a Needle
- novelchip entered Easy Rubber Machining With a Needle in the Plastics Contest contest
- novelchip commented on dAcid's instructable Pneumatic Logic Gates Made With Simple ToolsView Instructable »
Here is a video of my 4 bit binary fluidic counter made by mixing CPL fluidic logic and resistor transistor fluidic logic. Works like a charm ! https://vimeo.com/231916371
- novelchip made the instructable Pneumatic Logic Gates Made With Simple ToolsView Instructable »
By mixing my fluidic resistor -transistor logic with your complementary logic MUX i finally managed to get reliably cascadable fluidic master-slave flip-flops and so for the first time a reliably working 4 bit shift register. Next step will be mounting the chips on a fluidic PCB before proceding with complete integration
- novelchip commented on dAcid's instructable 3D Printed Pneumatic Logic GatesView Instructable »
In my opinion it would be even more interesting to try to operate these circuits with pressure instead of vacuum although achieving good sealing will be more difficult.
- novelchip commented on dAcid's instructable Pneumatic Logic Gates Made With Simple ToolsView Instructable »
Finally also my miniatured version (universal gate chip size 8*8mm^2) works as it should using one chip as MUX and the other as buffer. With the circuit connected as shown in the photo and using a syringe as vacuum supply i determined that the circuit consumes 0.3cm^3 per switching operation and i could perform 100 times switching with just 30cm^3 of air!
- novelchip made the instructable Pneumatic Logic Gates Made With Simple ToolsView Instructable »
Finally i got the complementary pass logic latch working using my chips. Actually i found it depended on a leak. Left lego switch is data and right is clock. The photos show the two stored states. The left chip is configured as a CPL buffer and the right chip as a CPL mux as in your scheme of the latch.
- novelchip commented on dAcid's instructable 3D Printed Pneumatic Logic Gates
Wow! Well done! I like in particular your way to cast the silicone microfluidic layer and will certainly try to replicate the idea using my cnc mill to make such a mold. One question: how well does the glue stick to the silicone. I thought it us hard to glue silicone to a surface.
View Instructable »About the latch circuit besides possible leaks you might consider to insert more resistive feedback channels in the loop since i also could not get it to work unless the feedback loop introduces a sufficient delay as i mentioned previosly. Adding resistance or capacitance in the feedback loop made it work for me and i could cascade several cpl latch curcuits.
- novelchip commented on dAcid's instructable Pneumatic Logic Gates Made With Simple Tools
To help develop microfluidics you may consider to "publish" your chip also on the new "Metafluidics" repository ! https://metafluidics.org/
o help develop microfluidics you may consider to "publish" your chip also on the new "Metafluidics" repository ! https://metafluidics.org/
View Instructable »To help develop microfluidics you may consider to "publish" your chip also on the new "Metafluidics" repository ! https://metafluidics.org/
- novelchip commented on novelchip's instructable Vacuum Powered Fluidic Ink "LEDs" and CircuitsView Instructable »
thanks
- novelchip made the instructable Pneumatic Logic Gates Made With Simple ToolsView Instructable »
Finally I got it working ! I made a minuaturized version of your universal logic gates using CNC milled PVC rubber sheets and a silicone membrane plus a plexiglass top plate with conical holes for small tube connections. The individual chips work perfectly and perform all the possible logic gate functions. The difficulties started when I went to combine them to make a D-latch. The feedback seems too weak and the state is stored only for few seconds. I could get the feeedback working stably ony by using 3 buffers in series instead of one. While there are no leaks in any of the circuits it seems that there is a problem of "signal loss" (low output air current?) in each stage and only by connecting in sequence 3 buffers it worked properly. The physical reason for that is still in…
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I'm glad to see that also you got nice results with this simple trick. by the way as i understand French I read your results description on your blog. If you try with a needle smaller than 0.6mm you should be also able to get laser-sharp cutting of rubber.