Re: [CAD_CAM_EDM_DRO] Re: Servos and Controller boards

oops, i have stirred an ants nest here, when i said "build your own servo
controller" i meant just that , assemble the electronic parts on a board,
design being way, way beyond my meagre capabilities.
I have built my own small cncGantry router and am on my way to converting a
small mini mill to cnc, i just thought that some one somewhere might have
already done the servo design bit and created a "map" if you like for others
to follow. On self examination i think its the journey which matters here
ref servos. Thanks for the tip for the OSMC. Many thanks all.

Nick

----- Original Message -----
From: "caudlet" <info@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, April 13, 2004 12:09 AM
Subject: [CAD_CAM_EDM_DRO] Re: Servos and Controller boards


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>
> wrote:
> > Tom,
> >
> > I think many would (and do) say the same thing about building a cnc
> > machine...
> >
> > (Why build when I can buy a perfectly good one for a great price?)
> >
> > I hope your reply doesn't keep folks from trying. After all, if
> > everybody only did what was "economical", we'd still be buying
> > expensive CNC machines.
> >
> > We are the recipients of MANY folks who "work for free", and I hope
> > that each one of them continues to find learning and sharing a
> > worthwhile exercise, so that one day we can have as many servo
> > options as we now have for steppers...
> >
> > Ballendo
> >
> > P.S. As "list mom" of the DIY-CNC group, I've heard a few "reasons"
> > given in answer to the recent thread about posts at CCED. And
> they're
> > NOT all about moderation... Many have told me that they are
> > frustrated by: asking a question for technical advice, only to get
> a
> > reply for a commercial product to buy. We're trying to build NEW
> > options, NOT just continue with the old ones... (And "money" is NOT
> > the only motivation.)
> >
> >
> >
> I did not make that post glibly. I would be the first one to
> recommend that building vs buying is an indivdual choice. You noticed
> I said "I would not attempt it". I have done closed loop controls
> with servos and spent a good many years working with switching power
> supplies that require loop calculations (that seldom are right). I
> have had a top of a plastic TO220 FET embed itself in my forehead.
> It's a mix of digital and analog design skills. The newer chips are
> all SMT and make a hobby level design a challenge for anyone.
>
> If someone posted and asked about designing and winding their own
> stepper or servo motors what would you advise? Each person has to
> evaluate their skill level and decide if the effort (and probable
> failure) to build something that can be purchased for 65 bucks is
> worth the "learning" experience.
>
> I think there is a subset of the membership that lives vicariously
> through the actual builders and can dream up all kinds of interesting
> engineering projects. Like I have said in the past some of
> these "projects" are solutions looking for a problem.
>
> If someone is looking to dive into the guts of doing a power servo
> design they should slide over to the OSMC (Open Source Motor
> Control). There you can rub shoulders with guys that have already
> tackled the problem of DIY servo controllers, brushless DC (BLDC)
> controllers and AC servo control.
>
> One of our responsibilities (sounds noble huh!) is to help guide the
> new persons through the maze. Part of that is to take our experience
> and keep people from heading off down a rough road and maybe loose
> them as part of our community. We have people here at all levels in
> the multitude of skill sets needed to build their own CNC machine.
> After reading hundreds of posts about something as simple as an
> unregulated power supply and the all the calculations, I just get the
> drift that the electronics design skill set is not possessed by the
> majority of the builders. Maybe we need a "star" rating system like
> they do on DIY TV. Building your own power supply is ** while
> designing a closed loop servo for power control is *****.
>
> I could go on and on but I have to go now. I am working on building
> my own blender. I am on a limited budget and the commercial blenders
> are too expensive; besides I need the learning experience and I have
> a CNC mill that I can turn parts out on and show my wife why I spent
> all that time building it :-O
>
>
>
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