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  1. Viroos

    Advice on toroidal inductor design for power harvesting

    The device is attached to the power line with no grounding and is used to charge a battery.
  2. Viroos

    Advice on toroidal inductor design for power harvesting

    The design is for the electric corporation itself. I make it as two halves.
  3. Viroos

    Advice on toroidal inductor design for power harvesting

    Hi, I'm a mechanical engineer, but occasionally do some electro-mechanical systems too, but I feel that my knowledge in EE is insufficient. Now I need to design a toroidal inductor in order to harvest power from overhead high voltage lines. How to do it right? The winding should be "simple" or...
  4. Viroos

    Cadmium Plating

    Well... we can't require certain storage conditions. Anyway, the munition, of course, will be stored in a controlled environment facility, but it's for sure not hermetically sealed or filled with argon. Also, we can't seal the device because it must have openings towards client's part of the...
  5. Viroos

    Cadmium Plating

    I wish we could change storage conditions as we want. They were set by our client who integrates our mechanism into his system. Actually, the munition is stored in an outer case with silica gel bag, but the munition itself isn't sealed. Anyway, what we got is a spec which explicitly requires...
  6. Viroos

    Cadmium Plating

    ...this is a part of the mechanism. All these items are made of steel, but they contact aluminum parts which I cannot show here. The bore in the slotted cylinder is 5.5 mm dia., its length is 30 mm.
  7. Viroos

    Cadmium Plating

    Sorry, I've been away for a long time... Thank you very much for your answers, they're very helpful! Regarding the design-I'm talking about Coke can size electro-mechanical munition subsystem, with motors, levers, lead screws and controller PCB inside, which has to be stored for 20 years at...
  8. Viroos

    Cadmium Plating

    EdStainless, Sorry, haven't got it... what kind of restrictions? Could you advise on a better steel? I think having the plating it shouldn't be stainless steel, am I right?
  9. Viroos

    Cadmium Plating

    It may be wet, outdoors, and the surfaces cannot be isolated.
  10. Viroos

    Cadmium Plating

    Hi Dik, We know that, but for some applications, like aviation, it's still widely used. Anyway, I'd be thankful for any advice regarding alternative plating (like IVD) as well.
  11. Viroos

    Cadmium Plating

    Hi, In order to provide long-term galvanic corrosion protection for steel parts contacting other aluminum parts we'd like to plate steel parts with cadmium (already having alodine coating on aluminum). Also, these steel parts are of high precision and must withstand very high loads, so...
  12. Viroos

    Hot Bar Soldering

    Thank you!
  13. Viroos

    Hot Bar Soldering

    Well... but how to bring the outer layer to the pads on the same side? Can I use vias on a flex?
  14. Viroos

    Aluminum/SS Galvanic Corrosion

    So in dry environment there is nothing to worry about? And if to chose the hardware for aluminum parts, which kind would you prefer-carbon or stainless steel?
  15. Viroos

    17-4 PH vs 420 Stainless Steel

    EdStainless, And what alloy would you choose for the "cylinder" (the transparent part) and the "piston" (the orange one)? One of the most significant factors in this design is the cost, any dollar we can strip off the production costs is important. WKTaylor, The temperature range is a standard...
  16. Viroos

    Hot Bar Soldering

    Hi, I have to design how to solder some very narrow double layer flex to another PCB by hot bar soldering process. The flex should have the same width at the and and cannot be widened and, also, cannot have a rigid PCB area at the end. Is it possible at all? How to bring two layers of conductive...
  17. Viroos

    Aluminum/SS Galvanic Corrosion

    Is it OK to use passivated stainless steel hardware (retaining rings, screws, parallel keys etc) on Aluminum 7075-T6 parts? The product will be stored in a sealed package, but for tens of years. Or it will be better to use some carbon steel stuff with less electric potential difference between...
  18. Viroos

    17-4 PH vs 420 Stainless Steel

    EdStainless, Thank you so much! Actually, I can show some screenshots, the length of the link is about 12 mm. Do you think it's a good idea to make the orange piston from C86300 bronze and the rest of the parts from 17-4 PH?
  19. Viroos

    17-4 PH vs 420 Stainless Steel

    Just to make things clear-of course, the device is tested, but not on the desk in the lab. Sorry that I cannot disclose more information...
  20. Viroos

    17-4 PH vs 420 Stainless Steel

    israelkk, In our case a lab test which can simulate the real loads isn't available, so we do our best and hope the design will work IRL. For a while, we succeeded doing this :) Anyway, some friction wear here isn't an issue, if I understand you correctly, because the lab test doesn't apply even...

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