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new to cutting over water

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phase5
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Joined: Mon Mar 05, 2018 11:06 pm

new to cutting over water

Postby phase5 » Thu Jun 14, 2018 10:57 pm

Hello everyone, I recently converted a downdraft table to a water, I have A 5x10 with a Icnc Promotion controller with Power Max 105 with Hyperthrem PHC. When cutting dry I did not have the following problem, after a few pierces the torch will not drop and contact plate and return to pierce height before firing, the torch stays in the reacted position ad fires at that height. I have replaced all consumables and checked all the normal things. I have the water 3/4" below the plate, I am getting a lot of water blowing up on to the shield and ohmic lead, will the water cause the phc to think the plate has been contacted and then fire it. Any suggestions welcome, thanks in advance

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larrycameron44
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Re: new to cutting over water

Postby larrycameron44 » Sat Jun 16, 2018 3:23 am

If you have water on the plate at first pierce, the ohmic will sense the top of the water on the plate as the metal height.
You can just blow this off with a air gun as the post flow will blow all the rest of the water away when piercing.

jimcolt
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Re: new to cutting over water

Postby jimcolt » Sat Jun 16, 2018 7:36 am

Sounds like water in the torch is causing a false ohmic signal. Ohmic sensing often does not work well with a water table. Table water is highly conductive with suspended metal particles....it gets between the torch shield and nozzle and the circuitry for ohmic sensing thinks it is sensing the material. The fix is to lower the water in the table....unfortunately that will create more fumes / smoke. My experience is that downdraft works better with ohmic sensing. Jim Colt Hypertherm

phase5
Posts: 3
Joined: Mon Mar 05, 2018 11:06 pm

Re: new to cutting over water

Postby phase5 » Sun Jun 17, 2018 1:17 am

Thanks for the advice, I disconnected the Ohmic lead and adjust the stall pot on the phc and so far it is cutting very good.


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