Wobbler Air Engine project for CCBCMD machine tools class CMM112

[PStechPaul]

I mounted the generator more solidly, and also made a post where I mounted the miniature bayonet base lamp (in an old military style lampholder), some binding posts to read the generator output voltage, and an inductive proximity sensor. I also connected it to the TigTac prototype and ran into some problems, as discussed in a HSM thread, but it now works reasonably well. Here is a copy of the latest post in that thread, showing the (almost) final set-up, with some video clips of the engine running on compressed air and lighting the 12V lamp, and running as a compressor by applying 20-25 VDC to the motor:
 
I added a 1k resistor from the sensor input to the PIC pin being used, and a 220 nF capacitor to ground. This seems to have eliminated the noise that previously caused erratic readings. The original code used an interrupt-on-change (IOC) method to detect contact close and open events, but that was very sensitive to noise, and difficult to implement a software filter. Now I am polling the contact state every 1 mSec in an ISR and requiring 3 consecutive stable readings to determine status. Since there is equal delay on sensing proper open and closed conditions, the accuracy of the dwell and RPM (based on time between closings) is only affected by the 1 mSec uncertainty of the sample. Thus a modest 600 RPM corresponds to 100 mSec/rev and accuracy is about 1%. Here are some pictures of the setup:









 Some video clips of the operation and waveforms:


http://enginuitysystems.com/files/TigTac/TigTac_1908.AVI (111 MB)

http://enginuitysystems.com/files/TigTac/TigTac_1909.AVI (147 MB)

http://enginuitysystems.com/files/TigTac/TigTac_1910.AVI (160 MB)

 and a video clip of the motor/generator running on compressed air (warning - loud compressor noise!):

http://enginuitysystems.com/files/CAMM112/Air_Motor_Generator_1900.AVI (170 MB)

[b.lindsey]

Paul, interesting setup but the files are painfully slow to view. Any chance of another format? AVI's seem to be bloated in my experience. Uploading to Youtube might be another option.

Bill

[Don1966]

I think Bill's has a good point here I can't open them in windows explorer it just sits there waiting for it to upload and takes forever. the other option is to save target as and that takes forever. Youtube would differently make life easier to see the video.

don

[PStechPaul]

OK, here it is:
 
<a href="https://www.youtube.com/watch?v=GUFMYTKVAv0" target="_blank">http://www.youtube.com/watch?v=GUFMYTKVAv0</a>
 
It seems that YouTube has made more "improvements" and now I cannot find how to choose a frame to use as the sample image (thumbnail) for the video. I waited for the choices to appear when it was done processing, but they never showed up. Then, I tried the "video manager" and editing options and there are no options to add the image. Previously you could select one of three from the video, or add your own. Does anyone know how to do this?
 
Somehow it "fixed itself". There were some new buttons that magically appeared along with the selected thumbnail choices. Weird...