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  1. jhudler

    switching AC power to DC power

    Why not look at a UPS (Uninterruptible power supply). THIS could power not only the camera, but the monitors, and records as well. A 1000VA or 2200VA would be perfect. See http://en.wikipedia.org/wiki/Uninterruptible_power_supply I have two APC 3kVA UPS's with extended battery packs with run 2...
  2. jhudler

    Electromagnet Vibration unit using a Neodymium cylinder.

    Solved this problem by not using magnetics. We cored the bottom of the vacuum chamber and placed a thick rubber disk with compression seals. Used it as a diaphragm and pushed on it with a eccentric cam on the outside and attach the inside via plate and rod to the table. This is not for UHV and...
  3. jhudler

    Electromagnet Vibration unit using a Neodymium cylinder.

    Well I'm trying to gently vibrate an epoxy aggregate mix, not experiment in interstitial fluid boundaries from cavitations of a dense polymer matrix. It's reasonable to move a 1/4 inch (that's sloshing) at very low frequencies; quite another higher up. Using your calculations @ 1/64 of an inch...
  4. jhudler

    Electromagnet Vibration unit using a Neodymium cylinder.

    That's an idea... only no hydraulic stuff around here.
  5. jhudler

    Electromagnet Vibration unit using a Neodymium cylinder.

    IRstuff's links do look good, but are rather large. Even the motorized version took up considerable space. I can water cool the windings on the coil. What's driving this is a need for compactness. Not having any experience with magnetic voice coils is reason I'm asking this question. Thanks!
  6. jhudler

    Electromagnet Vibration unit using a Neodymium cylinder.

    The motor (new) ran perfectly in normal atmosphere. What about using more four, one one each corner of the frame? The audio amplifier comment really wasn't a serious one, just thinking out loud. NickE, how did you determine power requirement of .25" at 2000Hz? I guess the bottom line...
  7. jhudler

    Electromagnet Vibration unit using a Neodymium cylinder.

    Mike, Ah yes I did leave that out and one of the things I wanted to get clarified. Weight can range from 10 lbs to 150 lbs (perhaps 300 depending on density). Deflection should be in a range of .05 to .25 inches (this is what I was doing with the motor driven version). I can also supply any...
  8. jhudler

    Electromagnet Vibration unit using a Neodymium cylinder.

    I have a project creating an epoxy based granite material. The sphere packing density is quite high with aggregate sizes from 2 to 600 microns. So that means I'm left with a very thick mix. Plus the added complication of doing this in a vacuum. Requirements: I need to make a shaker/vibration...

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