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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...

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...

Thank you for your responses and questions: 1) we do not have a material analysis. This is the leading edge of the investigation. We will send a magnet out for a Chemical Analysis. 2) we do not receive Chem Analysis with BH shipments. Only BH curves. The BH curve that came with the...

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...

Thank you dgallup, the link was most helpful, mac

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...

To finish the thread..... I found a company called Scitech. All of their scales use a VCM type device to return the system to a "null" position. The stop to stop stroke is 0.002" and the resolution is in micro-inches. So, there may be some deflection, but 100 less that my gap tolernace. The...

Hello, Israelkk: About a 25 newton compressive force is required by one of our many clamp solutions to "fixture" the magnet. The magnet is Pulled "normal" to the work-piece and the compressive fixture device "grips" the magnet assembly from the sides. Regarding the magnet. The "magnet" is...

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...

Thank you for your response JR0097. Yes, that is what we currently do (leaxn 8010 film stock). That requires us to fixture/clamp/etc on the magnet assembly. This seems strait forward, but it is not. Also to meet the 6N tensile force we need about 25N of compressive force. This begs the...

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...

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...

Thank you Ed and Mag Mike: You were correct. Our wood table top has a horizontal steel support. When we moved testing loactions the extract /flip methods were much closer. Still not exact, but much better. I always value your responses and posts. Thanks again, mac

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...

Thank you Roy & Gunnar! This new device is for our mannual power supply and it is very cost sensative. Our PLC driven power supplies do use a step down transformer and a timed pulse for the the reversing. These auotmatic power supplies are performance based and allow for a higher number and...

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...

MagMike: I really appreciate the input. Mac

Hello, MagMike: Some people here are fearful because we have not quantified the degree of out-gassing. So we are somewhat executing a preventative action as insurance. The vacuum we intend to pull is 1x10^-4 Torr. Thank you for the reply. Mac

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...

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...