Re: [CAD_CAM_EDM_DRO] cnc mill project

Thats exactly why we only considered servos. As I understand them, stepper
systems are typically open-loop. On the other hand, I have seen some stuff
on the internet about hybid stepper systems, but it is pretty undetailed.
Consider for instance, a stepper contolled mill system with linear encoders
mounted on the knee. Would this system not be capable of closed loop control
in every manner that servo systems are? I'm having trouble finding good
literature on control systems specific to servos/steppers. Typical contol
books are very general in topic and geared more towards specific industries
rather than CNC's. Does anyone have a good web resource on the topic?

-John

----- Original Message -----
From: "David A. Frantz" <wizard@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, May 13, 2004 7:44 PM
Subject: Re: [CAD_CAM_EDM_DRO] cnc mill project


> To add another perspective depending on what you intend to do with your
> study of adaptive controls a true servo system may be more useful and
> flexible. By true servo I mean a system that closes the loop through
> the processor running the control code. This would allow information
> that can not be had with step and direction controls to be feed directly
> into your algorithms.
>
> Obviously there are a number of things that you could be interested in
> under the guise of adaptive controls that could very well be attacked
> with step / direction electronics. The use of a Taig though indicates
> that you probally could implement a number of differrent systems
> relatively cheaply.
>
> Thanks
> Dave
>
>
>
> John D. Bussema wrote:
>
> >Interesting thought. I have only considered servos from the very begging
of
> >the project. For one, I think I was just under the impression that servos
> >were better in general terms. I also might be biased by Taig's
> >premanufactured CNC mill, which uses an open-loop stepper system and
> >performs very poorly (so I hear).
> >----- Original Message -----
> >From: "Nick Ibbitson" <pulseweld@...>
> >To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >Sent: Thursday, May 13, 2004 11:16 AM
> >Subject: Re: [CAD_CAM_EDM_DRO] cnc mill project
> >
> >
> >
> >
> >>Just a thought but I would have thought steppers would be cheaper to use
> >>
> >>
> >on
> >
> >
> >>something as small as a Taig Micromill, they are certainly powerful
enough
> >>and cnc control software and suitable interfaces are readily available
on
> >>both sides of "The Pond".
> >>
> >>Nick
> >>
> >>----- Original Message -----
> >>From: "John D. Bussema" <bussema@...>
> >>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >>Sent: Wednesday, May 12, 2004 11:33 PM
> >>Subject: [CAD_CAM_EDM_DRO] cnc mill project
> >>
> >>
> >>
> >>
> >>>First, thanks for the info regarding Gecko drives, I found it very
> >>>
> >>>
> >useful.
> >
> >
> >>My friend and I are industrial engineers at U of I and are converting a
> >>manual Taig micromill to CNC as part of an independent study in adaptive
> >>control systems. We currently in the very beginning stages of the
project
> >>and are trying to figure out what components to purchase for the initial
> >>conversion. I have a pretty broad background in machine tool systems, in
> >>addition to being a metalsmith, but I don't know all that much about CNC
> >>interfacing. We'd like the machine to be both accurate and cheap. We've
> >>decided to use the Gecko drivers for the project, as I've seen them on
> >>numerous websites and all have spoken very highly about them. I was
> >>wondering if anyone has suggestions for the type of servos we should
use,
> >>particularly: typical ranges for continuous torque, speed, voltage, and
> >>encoder resolution (we plan on using rotary encoders). We're also
> >>
> >>
> >interested
> >
> >
> >>on upper bounds of the same parameters (i.e
> >>
> >>
> >>> . the maximum values that are worth paying for). If anyone knows of a
> >>>
> >>>
> >>cheap surplus servo supplier we'd be interested in that too Thanks a
lot.
> >>
> >>
> >>>-John
> >>>
> >>>
> >>>[Non-text portions of this message have been removed]
> >>>
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