Re: [CAD_CAM_EDM_DRO] heavy CNC lathe retrofit

av1a wrote:

> I got myself a CNC Lathe (heavy actually)
>
> Sanyo Denk DC servo drives. x 2
> 7amp Cont. Torque - 55 kg-cm
> 50amp Peak Torque - 400 kg-cm
> RPM - 1000
> Volt- 25v
>
> what do i need to make it work again ? gecko G320 ?

A Gecko 320 is only good for 20 amp max. As the Gecko
can be driven at 25VDC, you should get 1000 rpm but
only reach 20/50ths (ie 40%) of your peak torque.
But at least its a viable way to get you going for now...

You might also want to check out http://www.rutex.com
They might have a higher amperage version.

> Mutsubishi Spindle motor -
> Volts 210 rpm 1150~3450

AC or DC? How many horsepower? Lots of options, but
too bad the new controller retail prices are $5K+ region.

-----------------

Actually, I am currently wrestling with the issue of how
to power my own spindle motor 240VDC & 102 amps (ie 30+ HP).

Variable speed would be nice. One line of thinking is to use
two International Rectifier (http://www.irc.com)
IRKT91/12A phase control SCR's (1200V 95Amp) arranged in a
full-wave bridge configuration, and driving the gates
with some kind of a duty-cycle circuit from the PC. The
Gate turn on voltage seems to be around 3-4 volts.

Any suggestions from some of you electronics experts?


Doug Fortune
http://www.cncKITS.com