Re: Servos and Controller boards

Nick,

In the PS of the message I just posted, are some resources along the
lines of what you were asking for...

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Nick Ibbitson"
<pulseweld@d...> wrote:

> 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@t...>
> 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
> >
> >
> >
> > Addresses:
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wanliker@a...,

> timg@k...
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there, for OT

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