502,842 active members
6,634 visitors online
Register for free
Login
Results 1 to 2 of 2
  1. #1
    Registered
    Join Date
    Aug 2008
    Posts
    9

    Ohmic probe interfacing

    I am not sure what forum to put this in, because it is in between the torch and the control electronics. What do people do with respect to actually hooking the shield on the torch up to the BOB input pin when implementing ohmic probing? It seems to me that there is potentially bad things that can happen that might allow the negative voltage on the plasma machine power supply make it to the input pin. How about isolating the pin with a relay during cutting? External zener? I am thinking it would be good to have something that is less expensive to replace than the BOB. I cannot find any discussions addressing this, nor have I ever ran across one. Does anyone have thoughts or inputs? Thanks!


    Sent from my iPad using Tapatalk

  2. #2
    Registered
    Join Date
    May 2015
    Posts
    333

    Re: Ohmic probe interfacing

    Try the circuit in this article I wrote for the LinuxCNC documents

    Plasma Cutting Primer for LinuxCNC Users

    You need two pins as we keep the power totally disconnected unless we are probing.. Works a treat! Good luck
    Rod Webster
    www.vehiclemods.net.au

Similar Threads

  1. ohmic sensing
    By stirling in forum General CNC Machine Related Electronics
    Replies: 19
    Last Post: 07-31-2017, 10:22 AM
  2. ohmic how to ?
    By lkigam in forum General CNC Machine Related Electronics
    Replies: 0
    Last Post: 08-07-2016, 11:03 PM
  3. TP-100 Probe - Compare Performance Motion probe to IMService probe
    By dgoddard in forum Digitizing and Laser Digitizing
    Replies: 3
    Last Post: 04-06-2013, 07:13 PM
  4. Ohmic Sensor - HOW?
    By gzm.pepe in forum General Waterjet
    Replies: 6
    Last Post: 07-31-2012, 11:59 PM
  5. Ohmic sensor
    By Bobbyr70 in forum General CNC Plasma / Oxy Fuel Cutting Machines
    Replies: 1
    Last Post: 06-03-2011, 04:38 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •