From: nojunk@knology.net   
      
   On 1/29/2018 12:21 PM, etpm@whidbey.com wrote:   
   > Reecently I helped a neighbor connect a Chinese made CNC plasma table   
   > to an American made plasma cutter. After I figured out that the   
   > "partial pressure" the Chinese manual mentioned was in reference to a   
   > built in jumper selectable voltage divider  I was able to get the two   
   > machines talking to each other and everything works now. But the   
   > Chinese manual shows a filter on  a sense wire and I don't know   
   > exactly what to do about it. The sense wire is connected to the copper   
   > shield on the plasma torch and to a terminal in the CNC control. The   
   > machine uses the shield to sense the work. The machine moves the   
   > plasma torch down until the shield contacts the work and then moves   
   > away a set amount and energizes the plasma torch. I think, but am not   
   > sure, that the control can now sense the distance between the work and   
   > the torch tip, so that if the work is warped and rises or falls the   
   > torch will follow the contour of the work. In any case, the connection   
   > diagram for this sense shows it being wrapped a few times through a   
   > ring. And somehow the manual alludes to this ring as being some sort   
   > of filter. Since the neighbor didn't have any type of ferrite rings I   
   > just wrapped a few turns of the sense wire through a few insulated   
   > washers just to see if I could get the machine to work. And it did.   
   > Well, I dug  a ferrite ring out of a bad switching power supply and   
   > removed the coiled wire from it. I'm hoping I can just duplicate the   
   > washers trick with the ferrite ring but I'm thinking that I need   
   > advice on how many turns of wire through the ring I should use. I   
   > know, there are many different types of ferrite and I have no idea   
   > what kind mine is. And there must be a bunch of other variables as   
   > well. But if I can at least not ruin anything it would be great.   
   > Thanks,   
   > Eric   
   >   
     You might put your blurb on rec.crafts.metalworking   
   Ignore the bickering that is presently happening, new name popped   
   in and giving one guy a hard time.   
     There are some very bright guys there.   
                                  Mikek   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)