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The Teensy, which is a dev board for an Atmel uC that has USB support may be an option. It's currently in high demand for PS3 hacks, but there are similar ready-to-go boards around.

USB is not a...

Many companies try this, but all the ones I've dealt with dropped that requirement when I refused to sign. Your mileage may vary though. A company owning your private work should come with a lot...

If you can use USB instead of serial, the Teensy http://www.pjrc.com/teensy/ (an AVR dev board) is more capable than the board you linked to, although you would have to program it using C since it is...

Use tcpdump or wireshark to look for an ARP packet when the machine starts up. I don't know if yours will spit one out, but it might.

Even if it does reveal its MAC, the machine may not support...

Since you are in India, try to find a manufacturer of small metal parts in your area. For example, watchbands. They will have lots of small machines running stepper motors to death. You might be...

Switch the motor with one of the others and see if it acts the same. If it does, then yes something is wrong with it.

Your driver will probably be fine as long as you select a current setting resistor below the max, but most likely the real maximum for a TB6560 is around 2.5A which is far below your target.

The limit for that driver is about 3A.

You can buy stepper motors from me (Edmonton area): KineticStep.com

Looks right to me, and it's a pretty common method of selecting different voltage.

However, if you aren't prepared to blow it up, I would wait for clarification from the vendor or have someone...

Once the magnesium is alloyed it may not be a problem.

Melting point of copper is 1083C. Use an inert atmosphere to avoid a fire. A microwave oven and a silicon carbide crucible would be a quick starting point for an experiment, but it isn't easy to...

NTE129 is supposedly very similar, but almost any general purpose transistor is going to work. If you have a bunch of junk circuit boards you could pluck a few off of them.

How big is your relay? Remember it has to be driven by less than 20mA if you aren't using an extra transistor to drive it.

If you use this approach with a relay you might consider including a...

PMed.

You can buy that kind of driver for around $100 including the fan and heatsink in China. I don't sell them, but I did see them demonstrated and they work pretty well. Not sure what they used inside...

The work piece itself won't be catching on fire without a lot of effort with a blowtorch, but the fine swarf will easily cause a fire. Sand is a good cheap option, though difficult to clean up.

http://kineticstep.com/media/s320.png
4.6 N·m, 86mm (650 oz·in, NEMA 34) Stepper Motors - $80

http://kineticstep.com/media/l320.png
8.5 N·m, 86mm (1200 oz·in, NEMA 34) Stepper Motors - $130
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