Re: [CAD_CAM_EDM_DRO] Re: Re: PIC-Servo

Hi Christopher

>So you are saying you are using EMC to run a servo
>without a step converter?

No you must have a step/dir. converter for a pic servo to work with emc. On
my machine that is another pic chip, that is located on the x-y-z axis
boards. The step converter has no purpose when the machine is not being
driven with emc. I purchased pic-servo chip set products and designed my own
board, so his board products will be diffrent than mine.

You must also initialize each axis before it will hold position. You can
do this with another pc, a pic micro that you have programed, a cheap lap
top, or what ever you can get with a free serial port, besides the pc
running emc. I chose to do it with a laptop running a qbasic program.

> PIC-Servos close the loop
>on position and are controlled by position commands
>via a serial line. The problem is to get EMC to
>communicate via a serial line.

exactly correct!

>With the new CMC chipset that buffers position
>commands it seems that all that is required is for EMC
>to output packets with the desired positions for all
>axes. Real-time output is not necessary since the
>PIC-Servo buffers up a bunch of commands.

You have done some homework I see!

>Has this
>type of communication been implemented in EMC?

No I dont think emc can do this yet, and I dont know enough about emc
code to figure it out. Must have taken a few real smart folks to get that
emc program working!

I had never touched c++ before I started to play with the source code
that kerr was giving away, but by "coding by example" I managed to add the
spindle control capability to his core code, and also add work coordinates
(ie g54,) drilling canned cycles, and other needed capabilities.



thanks
andrew-kn6za

_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com