Re: Rambling hydraulic post that was: Multiple syncronized spindle question.

[Ray Henry <rehenry-at-up.net>]

Hi Howard

As a matter of fact, there is thermal compensation built into the EMC 
code someplace.  I am not certain where it is and whether it can be 
tapped to do more than the length of an axis but it is in there.

Ray

BTW -- thanks for snipping. 

On Friday 27 September 2002 10:36 am, you wrote:
> > Ray Henry says:
>
> snip
>
> > I wrote a digital controller for a hydraulic load frame.  It works
> > very
>
> well,
>
> > except that it does have significantly lower errors once the fluid is
> > up
>
> to
>
> > temp.  I am porting the software from dos to RTlinux to see if I can
> > clear things up using a floating point controller, because I am
> > having numerics
>
> issues.
>
> and snip some more
>
> Would it be worth it to take a temperature reading of the hydraulic
> fluid and based upon the temperature adjust variables to compensate for
> the increased viscosity until the machine warms up?  I know some high
> end CNC mills compensate for differential expansion of the glass scales
> and the milling table.  Just a thought.
>
> Regards,
>
> Howard Bailey