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frankeng9, I was not clear nor should I have indicated a bi-directional solenoid. The need is for a single direction solenoid with 0.25 inches, or more, of semi-linear stroke. Where semi-linear means as linear as possible, but some non-linear characterists is still a useable solenoid. Thanks.

The final objective is to find out if he can design his own solenoid with more linear spool travel as current through the coil is varied. This comes about because the solenoid he has been purchasing has something like 1/8 inch useable semi-linear stroke. He wants up to a 1/4 inch stroke if...

A friend is trying to get an electromagnet to interact, solenoid style, (push and pull) with a strong rare earth magnet. The objective is to move a iron spool. Where the coil is wound around a brass tube that spaces the inside of the coil 1/8 inch from the outside surface diameter of the...

A friend is trying to get an electromagnet to interact, solenoid style, (push and pull) with a strong rare earth magnet. The objective is to move a iron spool. Where the coil is wound around a brass tube that spaces the inside of the coil 1/8 inch from the outside surface diameter of the...