Ohmic Sensing Failure

Discussion in 'CNC Cutting' started by IowaMetalArt, Feb 10, 2016.

  1. IowaMetalArt

    IowaMetalArt New Member

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    I'm hoping that someone on the forum also has an accumove 2 box and can help me work around the ohmic sensing not working. I have a Torchmate 4x4 that I bought second hand from a guy in Des Moines. I use to cut out metal art. The torch will just crash right into the my metal and make a terible binding sound. I have to rush to hit the stop button. I have no idea why it isn't working. Can someone who's gone around this help me out?

    -Rodger
     
  2. LECS-Mike

    LECS-Mike Member

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    Rodger,

    To temporarily disable the ohmic sensing, this can be done under the Job Setup screen. There is a button that says Ohmic Sensing, either On or Off. When set to Off, the proper way to set the material thickness is to jog the Z axis all the way to the top of its travel until it stalls, then click Reset Z position. Then go back to the Job Setup screen, and jog the Z axis down slowly until it's either just making contact with the surface of the material, or just off it. Then click on the Set button next to Material Thickness. Then click on the Go to Program Zero button and click OK to return to the main screen. Once at the main screen, proceed to run the job. I highly recommend the system be setup in the Automatic AVHC mode for best operation without Ohmic sensing.

    If you have some time to contact our support time, I'd also like to make sure everything is setup properly to get ohmic operating for you, as it does make operation smoother.

    -Mike
     
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  3. Dnmeistr-LECS

    Dnmeistr-LECS Moderator Staff Member

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    Rodger, there are a couple procedures that will need to be verified in order for Ohmic to work correctly. First you need to ensure the torch is starting out from the top of its travel, which in this case is Zero. If not jog the Z axis up till it is topped out, press the Reset Z button, at this point you can jog the z axis down to help better position the torch onto the material, then press the Set Program Zero button. Jog the Z axis to the desired retract distance, safe distance the torch will retract to between cuts, on the Job Setup screen press the Set button next to Partial Retract Position, you can also change the mode to Partial for Retract Mode. To bring the Z back up to the top, press the Go to Program Zero Button.

    For Ohmic to work correctly you will need to check for continuity between the material and the ground stud on the back of the VFC box, see post on proper grounding, ohms reading needs to be less than 30 ohms. We will also need to determine if you have a relay and if you don't, contact support@torchmate.com to request one, see post on relay installation.
     
    Last edited: Feb 17, 2016
    Llgarcia81 likes this.
  4. IowaMetalArt

    IowaMetalArt New Member

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    Metal art is back in full swing! Thanks ya'll!
     
  5. Matt

    Matt Well-Known Member

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    Great to hear!
     

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