SERVO

Hi everyone,

Some comments:

Bertho Boman: As far as I understand what you wrote, then what
you try to do is just to make an external servo controller. There
are many of them around, - you just have to add the bridge. These
get the velocity from the encoder as you say. There is also asic DSP
chips with a lot of functions included. Anyway - all the software
you need is difficult and a lot of hard work. So - why make another
one ?
As far as I know, - you will get some trouble to "sync" several
axis, - and this has to be feed from your PC ( if you don't put in
G-code interpreter into it ). The way I understand it - you are
back to where EMC started out, and have tried to solve.


To Jon Elson:

I have to hand it to you - You are good ! do you know that ;-)
I treasure everything you say !

I am worried though, - I don't like to burden you with all the work
that we create for you. ( or - I do ) .. . because I have more
questions.

Your answers to my 1,2,3 -

1.
In my first question I pointed out that we have some trouble to
understand what size of motor needed, and then you point out the
"wind up" problem to overcome friction. This problem would be
smaller if you select a larger motor ? ( I did understand what you
said, and I know you always will have a following error - you also
said this in an earlier mail )
A: But would you have less problems if you "oversize" your motors
?
B: Would this also be the case even if you add tacho ?

2.
Tuning: You say ALWAYS - I am not sure I understand this. Many
years ago I tuned some Glentek servo amps, - I did fine tune them,
or checked them once a year or so. In a five year period. That is
why I find it a little odd. Or are you referring to the tuning of
the EMC parameters ?

3.
A digital oscilloscope ? I have not found anything like that in EMC
- I must have missed it, or do you refer to the programs that come
with the
board ?

One of the thing that I started to wonder about. Could this error
have something to do with a "roll over" in the LS7166 counters ?



//ARNE