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  • Users: MAC3382
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  1. MAC3382

    Gap filling at Liquid Nitrogen Temperatures

    Hello, All: I am trying to fill a cylindrical gap between a magnet array and an Aluminum tube. The magnet array is ~ 3.940" OD x 6" axial length. It fits within a 6061-T6 Al tube with an ID of ~ 4.000". (The device will have flanges at each end.) The array is assembled at room temperature...
  2. MAC3382

    Bondable Magnet Wire Insulation Removal

    Hello, All: I would appreciate any help you may have to offer. We are at the very leading edge of a production design for an OEM and manufacturing some proof of concept prototypes. I will need to hand wrap some very small precision coils using 28 gauge bondable magnet wire. The magnet wire...
  3. MAC3382

    Failure mode during manufacturing of Neo magnet

    Hello, All: We recently received a shipment of Neo magnets that we use in one of our products. We have been using this vendor for many years and they come from China. During a QC inspection, we found some very weak magnets and we have never experineced this before. (Seems like they were...
  4. MAC3382

    Permeability change with Temperature

    Hello, All: As always, thank you for your help! I have a new application where we will be operating a magnet assembly in the 450C temperature range. The magnet assembly will be comprised of permanent magnets and some high permeability metal, yet TBD. At lower temperatures we would typically...
  5. MAC3382

    Special Load Cell (VCM)

    Hello, All: Is anyone familiar with a scale that utlizes a loadcell/mechanism that is elctronicaly compensated/Magnetic Force Correcting? The way is was described is that as the mass is applied to the measuring pan there is displacement, however; unlike a traditional loadcell the pan is...
  6. MAC3382

    Force testing with a magnet

    Hello, All: I hope that this is the appropriate forum for this question. I have a job in-house which requires quantifying the break-away force of a magnet assembly (~ 6 N +/- 2%) through an air-gap with a tolernace of +/- 0.015mm. The magnet attracts to a precision work-piece of a specific...
  7. MAC3382

    New DFAR Requirement

    Hello, all: Our compliance department just alerted us to a new version of DFAR (Buy American Act )specifically pertaining to Specialty Metals; however, no one here knows what to make of the change. Being the so called "magnet guy" in our company I was asked to research it. We buy SmCo which...
  8. MAC3382

    Helmholtz coil phenomenon

    Hello, All: We have started using a Helmholtz coil and a flux meter to measure the magnets used in our products. We typically measure in Weber Centimeters and this works well for a relative comparison to a known good magnet sample. (We compare the magnetic moments between a magnets that works...
  9. MAC3382

    Resistor question

    Hello, All: I would appreciate any help that you may offer. 1) I have an electromagnet application (large inductive load) and in order to ensure a positive release of the work-piece we apply a reversing pulse. (This accelerates the decay of the residual orientation of teh dipoles in the...
  10. MAC3382

    Plating / Coating for SmCo

    Hello, All: I would appreciate any input for the following- I have SmCo magnets operating at 350c and under vacuum. Our concern is out-gassing and I do not know of a plating or coating which will prevent the out-gassing and stay intact for the few years of service required. We would...
  11. MAC3382

    Potting agent to operate @ 25,000 ft

    Hello, All: I would appreciate any suggestion for a potting/encapsulating compound to use in a device we are constructing. The device is custom electromagnet used on an aircraft. The potting/encapsulating compound will fill the voids around the coil and it will not be required to offer any...
  12. MAC3382

    Potting agent at 25,000 ft

    Hello, All: I would appreciate any suggestion for a potting/encapsulating compound to use in a device we are constructing. The device is custom electromagnet used on an aircraft. The potting/encapsulating compound will fill the voids around the coil and it will not be required to offer any...
  13. MAC3382

    O ring sizing

    Hello, All: I am new the forum and I would appreciate any help you can offer. I have to size an o-ring and I do not know the method to do so. I will describe the geometry of the system and please ask for clarification. I have two plates ~ 0.375" thick and of simliar cross-sectional area...
  14. MAC3382

    Bonding to powder-coat

    Hello, All: Could anyone suggest a type or specific adhesive for bonding to a polyester based powder-coat? The adhesive would obvioulsy be applied after coating, but it must withstand intermittent exposure to 300 degrees F. It would be most beneficial if the set-up time was 1 ~ 2 minutes or...
  15. MAC3382

    Chemical Etch as a pretreatment to boning

    Hello, All: I intermittently need to bond various ground metals to similiar or different metals. Sometimes the metals are soft, but usualy these metals are extremely hard and an adhesive is our only option. (Please trust me on that one.) These metals may or may not have a plating applied and...
  16. MAC3382

    Thermal rise calculation for a DC Electromagnet

    Hello, All: I am new to this forum and I hope that someone can help me. I would appreciate any and all input. From time to time my company needs to employ a DC electromagnet for custom pick and place operations. We will typicaly purchase "off the shelf" standard round, rectangular, and...
  17. MAC3382

    Calculating the temperature rise in an electromagnet

    Hello, All: Great Forum! From time to time my company needs to employ a DC electromagnet for custom pick and place operations. We will typicaly purchase "off the shelf" standard round, rectangular, and bipolar units and assembly them in an array on some sort of backing-plate. This works, but...
  18. MAC3382

    Neodymium surface prep

    I have been reading the posts for the past few months and you all offer a wealth of information. I now find myself needing some advice about bonding a permanent magnet material. I need to bond some sintered NdFeB magnet material to a 416 SS shaft. I have read quite a lot about corrosion with...

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