Wednesday, September 24, 2008
First try at cutting steel
Some time ago I resolved that I would take a crack at making Tommelise cut the thin sheet steel to do the field offsets for the linear tin can stepper that I've designed. I bought a little diamond cutting head for about $9 that works with my Dremel.
Field offsets are how you turn an ordinary air core electromagnet into a multi pole magnet suitable for making what is known as a "tin can" stepper motor. You can see here what I am talking about.
I plan on using a 3/8-24 inch threaded rod for a lead screw for now till I figure out how to cut my own lead screws. You can buy that kind of threaded rod in most good hardware stores. One of the gripes that I have with the Haydon linear stepper motors is that the 3 mm lead screw is far to flimsy for the lengths I'm using. Making my own linear steppers lets me fix that problem as well as controlling the costs. Now I just have to write a little routine that will generate the profiles that I need to cut.
Im not a magnetics expert, but all the motor and transformer benefit from laminated construction to reduce eddy current losses.
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