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VĂdeo mostrando o pulso PWM necessário para movimentar o servo.
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Parte do projeto de LaboratĂłrio Integrado:
- Conversor A/D
- Movimentação de Servo Motor
Alunos:
Diego C. Carbone
Carolina Canato
It looks like wires cross a lot, but they never touch, always separated by a few mm and relatively rigid. It would short if crushed, but it holds its shape well.
Components gathered and wires bent, ready to get building, I didn't cut a wire for the vertical line and a few others can't be seen. I didn't use a few in the end-- component leads were long enough for a few.
Gracias a todos por vuestros comentarios y reconocimientos...
Por favor, no use esta imagen en los sitios web, blogs u otros medios de comunicaciĂłn sin mi permiso explĂcito - Todos los derechos reservados ©.
Please don't use this image on websites, blogs or other media without my explicit permission - All Rights Reserved ©.
On pushback. This CRJ was first delivered to PLUNA of Uruguay as CX-CRA in March 2008, briefly becoming C-GMXY in June 2015 before joining GoJet's fleet as N186GJ in September 2015.
I wanted to grease the gears of our beloved CNC but I knew from last time that it was a difficult job and that I would end up greasing everything except the gears. The adapters that came with the grease pump don't fit onto the grease nipples of the CNC.
So I wanted to build an adapter that would supposedly help me to get the job done. The printed part looks interesting but it still didn't work out and I ended up with lots of grease on my fingers and laptop.
At least I created enough havoc at the lab to get the attention of Rene. He kindly explained to me how grease nipples work and I'll just get the right thing from a shop on monday or design a new part but that might be tricky since it needs close tolerances.
But still I like this object :) it takes just 10 minutes or so to print, is very stable and it makes me think about gears we could print. I don't understand why the current design has non-printed gears. But hey it's free I can change it...I love freedom :)
I also tried to print it with different temperatures and extrusion speeds to test what parameters would be good for the use of ABS as support material. My result was that we would need to be able to control the feedrate for this. At this time we only set the PWM rate but we don't know exactly how fast the motor turns and the speed varies especially if you use low PWM values. The object on the right was extruded with a high PWM rate (160) and the one on the right at 80. (These numbers are probably only useful for our setup because we use a nonstandard extrudermotor.) This shows what I heard first from Vik in 2006: The with of the filament can be varied by changing extrusion speed and/or feedrate. In the part on the right side the filament is about 0.5mm wide. Layer height is still 0.35mm.
Gracias a todos por vuestros comentarios y reconocimientos...
Por favor, no use esta imagen en los sitios web, blogs u otros medios de comunicaciĂłn sin mi permiso explĂcito - Todos los derechos reservados ©.
Please don't use this image on websites, blogs or other media without my explicit permission - All Rights Reserved ©.
guns don't kill people...people with mustaches kill people
Foto: www.flickr.com/flamothe
Retoke: koleguito,funitastika y kxalot
Sorry for the blur, but it's the only shot of this end from below-- the pot+switch with the diodes, and the IC splayed out.
Control of the electric kickboard with an arduino.
The arduino controls the speed of the motor through a PWM signal (that's one of the "hacked" parts of the original electric kickboard) that itself depends on the amount of light read by the light sensor. The arduino controls the direction of the motor through a relay (the other "hacked" part).
Our first lab run of the solar water pump using a helical impeller (like the ones used on an oil wells) and a PWM (Pulse Width Modulation) 3 phase DC motor that is optimized for solar use (shifting the PWM frequency depending on voltage coming from the array…which tends to changes throughout the day). What does this all mean? Well we never hit our target efficiency (92%) or even exceeded the efficiency of traditional water pump (80%), instead we peaked at 53.4%. Dismal results on the first try, but it is the first try. Now its time to fish out the problems…motor, pump, controller, PWM frequency, test rigs and more. Sure wish I had that Finite Element Analysis software right now!