Re: [CAD_CAM_EDM_DRO] Re: Looking for a servo amplifier.....

Doug,

If you swap the motor and it still looks like the drive is bad you
may wish to take a soldering iron and reheat the connections
on the board. Especially the pot that is acting up and any of the
larger connections that are soldered to the board. Sometimes
the flexing caused by heavier items connected to the board can
cause cracks in the solder joints which can cause intermittant
problems. I have never fixed a servo amp this way, but it has
worked on other things.

Bill

> Jon & Matt,
>
> Thanks for the excellent and knowledgeable responses and suggestions.
>
> Jon, good idea to watch Ebay, you never know what'll show up there.
>
> Matt, I went through the SD's recommended tuning procedure and the
> results were so far off that the axis was not functioning. Their
> tech suggested matching settings to the axis with the closest
> loading, X. That worked very well. I noticed in matching, some of
> the number of pot turns were off by large factors from the initial
> recommended settings. Again, the BAL pot on the Y axis seems to have
> no effect, the other axis BAL pots function correctly. That's the
> main reason the SD tech suggested replacing the board.
>
> In my current situation I don't have the time or inclination to go
> too deeply into this problem. The machine is loaded at least 8 hours
> a day for the near future. I don't mind spending a little money to
> replace bad components if I have to just to keep things going here.
>
> I do have concerns with taking the "replace the board" advice, that
> seems to be the way techs fix CNC's these days. Very little analysis
> of why or what is going on, fix the problem by a process of
> elimination in replacing possibly suspect components, all at the
> customer's expense.
>
> The surest way to isolate my problem will be to either swap axis
> motors or boards and follow the problem.
>
>
> It would be nice to have a spare axis drive card and motor. I think
> Dynapath still has PIC chips for my control to support a fourth axis.
> That'd be a nice justification to spend the money.
>
> thanks again,
>
> Doug
>