Re: EMC Running My Controller

I have been using the servo lite system for about two years. I have one of
the protypes on my enco mill. Bill and I worked together to improve it quite
a bit and I think we have achieved that. I have the newer design in one of
my cases running my mill drill.
Now that I have emc up and running I went back and read the docs. I
discovered that using the parallel port you are limited to 5KHZ thru the
parallel port. On a stepper system that would be 5000/400 (steps per rev)
=12.5RPS X 60 seconds = 750 RPM which is pretty fast. In the full step mode
you would get 1500 RPM's However on a servo system with a 200 count encoder
in quadrature is 800 counts and at 5Khz/800=6.25RPS X60=375 RPM
If that is correct in the docs then that would be ther limiting factor using
the parallel port. I plan to connect it to my servo system anyway on the
chance that the doc are wrong and the thru put is faster. I'll let you know
in a few days when I switch over to the servo system.
Dan
Bill and I have talked about using an isa port like the servo to go system
and run the signals to a modified servo lite board
-----Original Message-----
From: Dan Falck <dfalck@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Sunday, August 15, 1999 4:53 AM
Subject: Re: [CAD_CAM_EDM_DRO] EMC Running My Controller

>From: Dan Falck <dfalck@...>
>
>Dan,
>
>How is the Servo Lite system doing? I would think that EMC connected to
>that would be a very cost effective way of getting a decent servo system
>without having to buy the $800 servo to go card. Keep us posted on how
>your EMC experiences go.
>
>In the past couple of weeks, I have been using EMC to run hundreds of parts
>on my machine. It is definitely a good system. I have run into glitches
>with other software, that I don't experience with EMC.
>
>Has anyone out there been using any Linux CAD/CAM yet? Arne, I looked at
>Xfig, but it doesn't seem to output DXF. It does output postscript, but
>then there's the problem of no CAM setup. Varkon looks interesting.
>(parametric programming , DXF out) As soon as I wipe Windows off one of my
>computers, I am going to install a pure Linux system, just to play with
>stuff like Varkon, etc...
>
>Mill/drill quill drive- I have a ballscrew running the quill up and down.
>It works great. The screw is held axially by a bracket that is attached to
>the bottom of the quill. the nut is attached to a timing pulley, which is
>attached to a hollow shaft that runs through two bearings, with some
>preload applied. So, the nut spins and the srew moves up and down. I
>ripped out the worm, pinion and spring assembly that are associated with
>the old z-axis downfeed. I don't even worry about drilling by hand- canned
>drill cycles work. I still have to work out tapping, but that's another
>project.
>
>
>Dan Falck
>
>There's not a word yet for old friends who've just met...
>~ Gonzo, The Muppet Movie
>
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