Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by jhudler

  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...

Part and Inventory Search