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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