i require a 3000rpm motor of small size

i am planing to run cutting blade which weights approx of 350-500 gm (for worst case) so i need good torque and rechargeable battery for capable running for at max of 2-3 hrs

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Like Jayfuu suggested. Buy an existing product and adapt it as needed. This cordless Dremel tool goes from 5K RMP up to 30K RPM.With some modification you can get it running slower and extend the battery life.

http://www.dremel.com/en-us/tools/Pages/ToolDetail.aspx?pid=8200
That won't spin a half kilogram blade though. ;)
....and a half kilo blade is non-zero diameter, so what kind of torque has this to deliver !
somfire (author)  steveastrouk4 years ago
thank you for u response Mr. Steveastrouk
i require it for an cutting torque
somfire (author)  mpilchfamily4 years ago
thank you Mr. Mpilchfamily
for your suggestion i think it may suite my purpose
Everything depends on the torque you need for the lots you're driving.
Jayefuu4 years ago
You could rip apart one of these. Or just use it.

http://www.dewalt.com/tools/cordless-saws-circular-saws-dc390k.aspx

Rotates at 3700 RPM.