Re: [CAD_CAM_EDM_DRO] Re: Bridgeport CNC Mill???

On 10/01/2011 11:52 AM, Larry wrote:

> Hi Dave,
>
> Thanks for the info. I did as you recommended downloaded the EMC2 ISO and put it on a CD then installed it on a computer.
>
> It definitely looks like it has a lot of bells and whistles that I need to understand. Not having a background in electronics I'm not quite sure how to convert the cable coming out of the parallel port on the computer to the serial port on the back of the existing controller.
>
> I'm assuming this can be done in the machine set up area in the software, or am I even supposed to connect the computers parallel port to the existing controllers serial port, or do I need to buy an interface. I'm quite sure the encoders are working because at one point I was trying to jump something in the servo box and all of a sudden the Z. axis started moving down. Another time the same thing happened with the X. axis.
>
> I really appreciate your help.
>
> Larry B.

What you need is called a Breakout Board. If you have the money, an
isolated one is MUCH better. Not because it protects the parallel port
(it does, but that is secondary), but because you are working with high
current and (relative to logic levels) high voltages switched quickly.
Ground noise is never easy to track down and fix, so the isolated BOB is
a big win if it prevents you from spending a frustrating month trying to
find a problem, only to find it is "ground jump" when the spindle turns on.

If your servos are analog, you will need a D/A board, those are more
spendy, but not intolerable. Pico Systems has some of these:
http://pico-systems.com/DAC16.html

If you have resolvers rather than encoders, Pico Systems has a solution:
http://pico-systems.com/resolver.html

Hope this helps

Dave 8{)

--
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