Re: [CAD_CAM_EDM_DRO] upgrade cnc

Bill,

Baldor makes a board that may help. I used one recently for a customer. Reversing the direction of a DC motor on the fly may be a problem. You basically need to stop the motor and reverse the wires.

Robert Colin Campbell
Bob Campbell Designs
www.Campbelldesigns.net
Mach 2/3 breakout boards
Relay boards
Spindle Speed boards
Stepper motors
Plasma Torch Height control

----- Original Message -----
From: bill hribar
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Tuesday, April 17, 2007 11:12 AM
Subject: Re: [CAD_CAM_EDM_DRO] upgrade cnc


Hi Bob and all who are trying to help.

guess you can't read my mind and it would help to know what the motor is for. I want to use it to drive the spindle. In fact it is driving the spindle now with great success. I just wanted to use the PWM signal from mach3 to control the rpm and direction of the motor. that way i can do screw th'ds and the like.

thanks for the help.
Bill

Bob Campbell <bob@...> wrote:
Bill,

What are you going to use the 12 DC motor for?

Robert Colin Campbell
Bob Campbell Designs
www.Campbelldesigns.net
Mach 2/3 breakout boards
Relay boards
Spindle Speed boards
Stepper motors
Plasma Torch Height control
----- Original Message -----
From: billhribar
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Monday, April 16, 2007 2:08 PM
Subject: [CAD_CAM_EDM_DRO] upgrade cnc

Hi all:
I am upgrading a small cnc to a more powerful cnc and am using mach-3.
what I need to know is how to interface the PWM signal from mach-3 to
drive my 12 volt DC motor. You can't just connect the output of the
parallrl port to a mosfet driver, can you??? what kind of circuit do i
need? Anyone?

thanks:
Bill

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