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Post by madpatty on Oct 31, 2018 14:41:04 GMT -5
Hello All, Was looking for some tachometer options for my turbine and came across this thread. Has anybody tried using magnetic?? sensors that come with stock RC turbines. Also what all is needed for those sensors to work. Do we need just the sensor and a small magnet with some sort of display SENSOR or we need a complete FADEC unit like this one:- Cheers.
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elventu
Veteran Member
Joined: October 2018
Posts: 122
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Post by elventu on Nov 14, 2018 18:06:24 GMT -5
For the HX60 project I bought (in 2007) an Omron E3X-A11, to do a work like the RCDON one. Because of the stop in the project, I used it on my bench mill (a waste of a good and costly instrument, maybe, but at the moment it was sitting on his box since years). Now I'm looking for a tachometer idea. Maybe it is one of the things I can start to do, because at the moment I can't do metalworking (because of my broken leg).
I have already a frequency meter/ tachometer with a divider in it (it has some settings, it is a cheap instrument off eBay, but it seems well built), but I need to made the sensor circuit.
I'm wondering if it is possibile to use a simple IR led and a photodiode, but I need a scheme. However I find some other E3X on ebay (a lot cheaper than eleven years ago... starting from 6€), and maybe I can use that one.
Someone have suggestions?
Thanks a lot!
Davide
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elventu
Veteran Member
Joined: October 2018
Posts: 122
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Post by elventu on Nov 21, 2018 7:33:18 GMT -5
I bought the E3X-A11 and his optical fiber (new surplus parts, less than 25€ shipped). I found the best choice of fiber, with stainless steel tube enclosure, I'm happy with this. Now I have to do some tests. I printed a 120mm diameter template with 50+50 black and white stripes to test the functionality at high frequency, I have to glue the template to a disc (I choose 120mm because it is the CD diameter), and then I put it in rotation on my mill. With 3000 rpm I can simulate the frequency I have on the turbo shaft at 150'000rpm. Some work has to be done, I have to put together two tension stabilizer, one for the optical switch and one for the frequency meter.
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