Re: [CAD_CAM_EDM_DRO] Conversational Programming and NAMES- very long!

Tim,
I am running an AMD K6 II 400 and only require 2000 steps per inch. I am
running freqmod Feb 29 I believe. When I tried it on my Bridgeport, movement
started getting ratty at 15 IPM and maxed out at 20 IPM. Looking at the
pulse train with a scope, pulse jitter (timing between steps) got worse up
to 20 IPM and then smoothed out to near perfect at 30 IPM and then started
going bad again. At 20 IPM the pulse train was varying by as much as 3/4s of
the signal width. I talked to Fred Proctor and he agreed that timing in EMC
was the problem.
Using micro stepping and small motors would probably let you move much
faster but with 1100 oz in motors and full stepping on the Bridgeport it
requires a clean signal. I am used to getting 120 IPM.
I have used the Microkinetics 8010 drivers with good success and I think the
problems that users have been having on this group is directly related to
the poor step signal timing.
Darrell

----- Original Message -----
From: Tim Goldstein <timg@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Thursday, May 04, 2000 12:05 PM
Subject: Re: [CAD_CAM_EDM_DRO] Conversational Programming and NAMES- very
long!


> Darrell,
>
> On my EMC install I can get up to 80 ipm or so and that is WAY beyond the
> instantaneous move capability of my steppers. I am running the freqmod
setup
> on an AMD K6 500.
>
> If you are running the older steppermod or are running freqmod on a slow
> machine you will poop out at a slower rate, but 20 ipm seems like you have
> something else going on or require a very high number of steps per inch.
>
> Tim
> [Denver, CO]
>
> ----- Original Message -----
> From: Darrell <dgehlsen@...>
> To: <CAD_CAM_EDM_DRO@egroups.com>
> Sent: Thursday, May 04, 2000 11:57 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Conversational Programming and NAMES- very
> long!
>
>
> Jon, What you say may be true for servo but not for steppers. To make
> steppers work properly we need something past the Linux box to create
smooth
> step pulses. The problem with EMC and steppers now is that the pulse train
> is ragged and you reach a point at about 20 IPM where the jitter on the
> pulse train exceeds the instantaneous move capability of the stepper motor
> and it stalls.
> Darrell
>
>
>
>
> ------------------------------------------------------------------------
> Free, easy email groups PLUS
> great features like calendars and storage files
> All at eGroups for you today. Go to
> http://click.egroups.com/1/3939/2/_/423600/_/957467029/
> ------------------------------------------------------------------------
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager
>
>