Re: [CAD_CAM_EDM_DRO] help for a newbie

Hi Emory, Kelly,

I'm afraid I'd have to disagree with Emory on a point or two. The +5
SHOULD be taken from the computer's power supply (Mariss has confirmed
it). The MOTOR power SHOULD NOT. Neither is it wise to use an "AT"
style power supply for 12V to run the motors. They WANT MORE! If I
remember correctly, 24V is about the minimum you want to use. Look for
a linear power supply, no regulation needed! I find them surplus all
the time! Or build your own with a 28V 10A or so transformer, cap and
bridge! That'll get you started!

Alan KM6VV


Emory Smith wrote:

>
> Please don't try to run ANY of the CNC drive from the
> computer's power supply. A good place to start would
> be to get a used AT type power supply to power the
> equipment. They usually run $5 to $15 and have plenty
> of power.
>
> Red=+5
> Yellow=+12
> Black=Ground (common to +5 and +12)
> Cut off and individually tape or heat shrink all unused wires.
>
> These supplies require a load so connect two 1 Ohm/5 Watt
> resistors in series from one of the +5 lines to ground.
>
> Good luck,
> Emory
>
> -----Original Message-----
> From: ksprayberry428 [mailto:kellys@...]
> Sent: Monday, August 26, 2002 8:47 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] help for a newbie
>
> Help!
> I am trying to set up my Gecko g201's on my parallel port , and I'm
> not having much luck, what am I missing? I am only playing with one
> drive for now as I would hate to fry all 3 by doing something stupid,
> which I am fully capable of doing!
> I asked the question about a wall wart last week, and since then I
> have come across an old computer to run turbocnc and to pull my +
> 5vdc singal from.
>
> I have the all the windings in the correct terminals on the g201, I
> don't have anything in the disable terminal 7 at the moment, I am
> just trying to get the motor to move for now. Terminal 8 I have
> connected to pin 2 on the parallel port cable, terminal 9 to pin 3 on
> the parallel port cable, I used a floppy disk drive power connector
> to pull my 5 volts from to terminal 10. I took and tied pins 18-25 to
> the ground of this same power connector (that may be the problem) I
> have a 36k ohm 1/4 watt resistor across terminals 11 and 12. I was
> told to set the amperage for about 2.86 amps. When I turn on the
> power supply I can feel the motor lock up, but thats it. I did feel t
> flinch as the computer booted up. It does have a good bit of holding
> torque. I tried to use the fkeybit, but that does not produce
> anything. I checked the voltage from the case to terminal 10 and have
> about 5.27 volts, I have about .5 volts on terminals 8 and 9.
> I have 8 wire bipolar motors with the windings connected in a series.
> I'm sure this is either something really easy that I have missed or I
> need to be saving my money for another drive!
> Thanks for the help!
>
> Kelly Sprayberry