Re: [CAD_CAM_EDM_DRO] Re: Servos and Controller boards

on a seperate note, I am trying to develop a simple pcb for a project (I
don't believe anyone has one exacually like i want), about how much does it
cost to have a pcb made?
Or, could I do it myself some how? (besides with a cnc.. I don't have one
put together yet ;( )

thanks-Lee

----- Original Message -----
From: "Dave Fisher" <dave@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, April 12, 2004 8:58 PM
Subject: RE: [CAD_CAM_EDM_DRO] Re: Servos and Controller boards


>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "caudlet" <info@t...> wrote:
> > I don't think I would attempt to design, layout and build a servo
> > motor controller. Because of the closed loop design there is a lot
> > more to it than just twisting a motor with DC.
> <snip>
> > I don't think you can "stick" build them for much less than
> > that even if you work for free.
>
> Unfortunately, the days of home brew circuitry and 'lashups' are
numbered -
> Technology has advanced so much (possibly for the better) that the
simplest
> of circuits to build on the kitchen table can prove to be more of a chore
> than the enthusiastic hobbyist would want.
>
> Most control circuitry these days is based around digital techniques -
> albeit it's only nought's and one's BUT an understanding of logic is
> required PLUS most of the logic stuff is 'glued' together with a micro or
> PIC, of which another understanding is required. All this is fine stuff
and
> good exercise for the brain. Now we need the analog bit - not so easy as
> logic - FAR more permutations of signals and sums ! After the learning
> curves of logic, micro or PIC software and analog circuitry, we come to
the
> point to actually make something. First we need an assembler / simulator
to
> write our code, on a PC of coarse, then we need to layout a circuit
board -
> another software package to source and learn. Now we have to get our PCB
> made and drilled. Hoping that the board we designed is OK, we can now
source
> the components, assemble the board (you ever tried to solder a surface
mount
> IC ? - lucky if I can even see em !) and test - Damn - I forgot to program
> the PIC ! Rush out and buy a PIC programmer, and so it goes on.
>
> I agree with Tom, but please, don't let my thoughts put anybody off
> innovation - after all if we never attempted to build or design anything
we
> would all still be in the dark with square wheels !
>
> Having been in the electronics business for over 30 years, and seen the
> quality and price of some of the servo amps (Rutex - Geko etc) I can only
> advise anyone just starting out on the CNC hobby route NOT to even think
> about building their own controllers or amps - What your Dollar buys today
> in terms of servo amps and controllers is FANTASTIC value, rolling your
own
> could be more expensive and time consuming than you think !
>
> Rgds
>
> Dave Fisher UK
>
>
>
>
>
>
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