Electromagnetic Coil 2 SS Rods Converging

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SUMMARY

The discussion focuses on the design of an electromagnetic coil intended to manipulate two stainless steel rods within a plastic tube. The rods, measuring 1/4" by 3/4", are to be pushed apart by a spring when inactive and drawn together when the coil is activated. Key considerations include the necessity of a metal casing to contain the magnetic field, the magnetic properties of the stainless steel rods, and the required current levels for effective operation. It is confirmed that using martensitic or ferritic stainless steel is essential for magnetic attraction between the rods.

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  • Understanding of electromagnetic coil design
  • Knowledge of stainless steel types, specifically martensitic and ferritic
  • Familiarity with magnetic field containment techniques
  • Basic principles of electromagnetism and current requirements
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  • Research electromagnetic coil design principles
  • Study the properties of martensitic and ferritic stainless steel
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  • Investigate current requirements for electromagnetic actuation
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Engineers, hobbyists, and designers interested in electromagnetic systems, particularly those working with actuators and magnetic materials.

cluelessGUY
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Howdy all,
I'm looking at having two (preferably) stainless steel rods inside a plastic tube (for insulation and so they don't touch) with a push spring inside and between the two rods pushing each other away from one another, when not activated inside of an electromagnetic coil. When the coil is activated, I want the two stainless steel rods to pull together and somewhat (they don't have to) meet somewhat in the center. The goal is more to move them closer to each other not so much meet together. Size wise, I'm looking at a 1" wide hole x 1" long in the coil (1" long coil), with 1/4" long by 3/4" wide SS (both rods) with the spring between. What would be required to actually make this happen? **see drawing to help with visual - the plastic tube is not shown** Note, the image is of the coil cut in half... IMG_2395.JPG

1. Will there need to be a metal casing around the coil to keep the magnetic current inside the 1" hole?
2. What will a metal casing around this coil gain?
3. Will the rods being stainless steel cause an issue?
4. Will there be a significant size in the coil to obtain this?
5. Will the current have to be very high to do this?
6... more importantly, is this even possible to accomplish with a coil like this?
 

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cluelessGUY said:
3. Will the rods being stainless steel cause an issue?
Yes. Some stainless steel is magnetic, most not. If you want the two rods to attract each other then they will need to be a martensitic or a ferritic stainless steel. They are rare except in sheet form.
 

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