Building a galvos and buying laser

Hi everybody.Can you tell me if as any chance you can build some quick galvos at home.Is a lot of hassle to do it.I know you must buy magnets,ball bearings and spindles,make a coils,position sensors.
I found some faulty dmx scanners at ebay here link.

I am thinking if i could use galvos and maybe fix and use electronics from them as well.
Mojo Geni Spinmaster 1 Disco Karaoke Light. DMX on eBay (end time 11-Feb-10 20:30:40 GMT)

Constella Astra Scans DMX Disco Lights (Pair) FAULTY on eBay (end time 23-Jan-10 21:29:55 GMT)

I found green lasers 50mW for about 16 British Pounds and 100mW for 19Pounds.
Is it good price for them?

Building galvos yourself can be done, but it's a challenging prospect. You're best bet is to contact a supplier like www.spacelas.com and pick up an inexpensive 20k set. The cheapest set spacelas sells retail for $88US plus shipping.

Regarding lasers, you'll need to use lab-style lasers with modulation capability. Modulation is the ability to rapidly turn the laser on and off. This allows for the cleanest imagery. The cheapest source I know of currently for TEC-stabilized laser show modules is Green Laser 100MW 532nm Diode DPSS Module + Power TTL - eBay (item 230420680253 end time Feb-04-10 15:45:31 PST) The seller has very good feedback, but I don't know how the lasers are. They're worth a shot at that price IMO..

I thought I can use pen pointer shape laser.And what about red one from dvd burner?The same problem?
I read some posts about building galvos but guy used water cooling angle grinder.I dot have that tools to make proper magnet shape.I am electronic engineer,have plenty hand tools and drills.

I believe it's been done with stepper motors.

They can be salvaged out of many things for free.

I have seen cheap galvos on ebey, never bought them.

As for using pointers or pens, they are not designed for continuous use, they will overheat in mere minutes.

Ok. thanks for advice.Is it okay to use dvd burner laser with optics?