Well, I looked for HPLJ printers yesterday, at my flea market. Lots of LASER printers but only 1 HP...that I wanted to pay for.
So, I got a batch of 4 printers for $5...one was an HP3, the others were just random...NEC, Lexmark, and something else.
So, since my steppers will undoubtedly not match, and will likely be of differing strengths, which axis needs the biggest one, and which needs the smallest?
So far I've gotten out 2 steppers -- a 31n-cm and a 22n-cm. In US units that's about 100oz-in and 66 oz-in, if I did my calculations correctly. And, like I said, they don't match.
I would imagine Z would need the smallest motor, since its motion can be stepped down more by choosing a different thread pitch on the screw. No penalty, since its length of travel is so short.
And, I assume the longest axis would need the strongest...same reason.
Am I assuming correctly?
-- Chuck Knight
P.S. One other thing. If I turn out to have both unipolar and bipolar motors...there's essentially a distinct driver circuit running each one, so it won't matter, right?