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| Sharing some project planning phase: A (digital) ELECTRO-MECHANICAL Network |
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| coppercone2:
You know what makes this more interesting now then 50 years ago, is that you have a high speed camera in reasonable smart phones. When I started seeing timing numbers pop up, in this time range, I kind of wonder if its within the realm of using a iPhone slow motion mode to prove this design.. this used to take serious money I think. Well, or it was a huge pain in the ass with a bunch of encoders and electronics. Talk about rapid prototyping improvement... when I think about this measurement problem and the capabilities of a phone. Timing a whole bunch of gears with a phone video is a gigantic cost reduction for a prototype. I think if you got a tripod or put the phone on a micrometer arm (and maybe some mirrors/periscopes on another one) it might be able to give reliable and reputable scientific data on a complicated gear train so long its not shooting oil everywhere. The magnifier app, seek thermal cam, slow motion cam, magnetic field meter (careful with this one, might be a gimmick).. and you can even hook up a sdr, high sensitivity microphone (acoustic signal analyzer) and external optics to it (macro lens, microscope lens).. not to mention it makes conferencing easier with photo upload I wonder how far it is from being a real life tricoder, useful for science. Tried the slopro app for iphone @ 1000 FPS, quite impressive. |
| RJSV:
Hey, a distraction for a minute: That R/C car has steering, and reverse, from remote. ...oh and was $ 9. 90 drug store chain. Likely great motor power. Make a good SCARE -CROW ! We got CROWs, bad. |
| RJSV:
Hey Coppercone2, how are ya ? Thanks, man, for, especially the micrometer mount. I do have kid-style microscope. Reminds me, I met a person, INDIA borne, that young person demo'd his 'Tech Rig', a soap box on wheels. But that kid welded, soldered, fixed any electronics, on the streets, of (Bombay?). Anyhow, I bet I would enjoy a good, mechanics shop supplies, for specialized, ultra-accurate shit, (that is, a catalog for lathes, etc. instruments. |
| coppercone2:
I had a look at spinning some high RPM stuff (like a kitchen blender) and it looks like the iphone app on a iphone 10 does a good job of looking at it.. a bit blurry but maybe the light is not enough.. if you are serious about high speed video you need very powerful lights. If you put a bright color on the gear it should be able to look at those response times, 1000 FPS is 1mS.. so you should get 100 frames of your object in slow motion. I don't know if they do some kind of digital magic that makes it less useful for actual science.. I had these old gear boxes I found before, small ones, about the size of a film canister, that were ultra precise with reduction ratios, brass precision gears and a slot for a photo diode break beam encoder.. I imagine that's the kind of thing you would use to 'test' the system you want. When I looked on ebay A while back they wanted like 200$ for each of those gear boxes :scared: manufacturers website was like $600+ Right now I am experimenting with using the FaceID scanner for 3d scanning. I think its quite impressive at making 3d models considering how poorly I took the pictures sliding on my ass around the floor to map a drink can... I was thinking about making a turn table for 3d scans and improving my home made iphone tripod that is too light (got some aluminum round plates from the trash that I can glue it to, and Possibly use two more plates to make a rotary base for it.. just by press fitting them with some retaining compound on a old hard drive motor. Great bearing, no cost, and can be computerized if desired later on (I think they are variable speed so its no problem to make it rotate slow?) Anyway.. if you never tried to harness the full power of your phone sensors its pretty fun.. gonna look at the lumen sensor and maybe try a sound FFT app also. I kind of wonder too if you can make a frequency counter for gears from a phone's magnetic field sensors for cheap RPM measurements. I think I had a app that graphed field strength on an old phone.. maybe someone made a counter.. great way to suck your expensive phone into a giant gear box too :-DD For gears, if they still had an audio jack on the phone, it would be trivial to fit a inductive pickup probe into it in order to get RPM recordings too.. that would be pretty high quality industrial grade stuff. I think they have a break out cable (I modified my inductive pickup probe to a BNC cable, so I would need a BNC to phono to iphone adapter). https://electrical-engineering-portal.com/wp-content/uploads/2014/04/inductive-sensors-purpose-working-principle.jpg It's probobly possible too to modify one of those ultra-rugged iphone cases with some 2450 cells (or flat LiPO) and power LED to make illumination for high speed video work |
| RJSV:
Thank you! Believe it or not, COMMODORE 64 has /had awesome real-time performance. You build a framework, like, say, 100 uSec per click. Course, your 50 Hz or 60 Hz video is going to be 16 milliSec per field for 60 fields per sec rate. Anyway, much of this is looking like 1 milliSec thru about 999 milliSec range, like 300 mSec typical. I thought, gear TOOTH took up 1 mSec, each, to pass by... Right now, I'm distracting myself with design for output 'SQUARE' waves, roughly: A mechanical 'Square-like' impulse features 450 mSec on time, CCW (that's counter-clockwise), 300 mSec off or coast-down time, and the same for CW, another 750 mSec. Total repeat time, of 1.5 seconds. and with decent stationary time, for less stress when change directions of rotation This thing would have like 3 or 4 special gear / switches, but one of a kind test ew. so not multiples. |
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