Dc servo motor control

rodw wrote:

That would totally eliminate the issue because if the drive was not "armed" for motion, the encoder becomes the master of motion.

I think that is how it works already....

Sorry for late reply and thanks. Guys I opened up the min error a little and it has been working perfectly! I feared tolerance would be lost but no problems. Very happy with the Linuxcnc and QTplasmac. It has been worth the extra effort over mach4. When I say extra effort a lot of the trouble for me was just getting used to the linux operating system. I'm suprised how well the height control operates without the need to mess around much with parameters. The float switch has been a good, simple solution (thanks Tommy!) I have been thinking of adding a plate marker of some kind, any ideas whats nice? A camera may be useful for the zero setting due to table width.

One of the first jobs, very happy. Done some 25mm plate also, performed very well. 

Is that the door to X men mansion?

Very nice, indeed.

Joeymcc wrote:

I have been thinking of adding a plate marker of some kind, any ideas whats nice? A camera may be useful for the zero setting due to table width.

Sorry, forgot about this, here is a nice way of doing markings on the cheap:


And a camera in a plasma environment will not last long, or if isolated properly needs constant cleaning.
Use a small cross laser, cheap and effective.

Tommy, have you found any replacement for the elmo 5/200 dc drives in the esabs?

There is a problem in one of my drives and is causes the fuse for the dc motor supply to blow up at the panel. On inspection there was a blown cap. I replaced all 3 caps but no joy.

On the plus side this is the first problem with the machine since proper completion of the retrofit. It has been brilliant!