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Needing assistance, Thermal Dynamics Arcing from electrode to tip

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LemcoIronWorks
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Needing assistance, Thermal Dynamics Arcing from electrode to tip

Postby LemcoIronWorks » Thu Dec 29, 2016 2:14 pm

I have a Thermal Dynamics 100 with machine torch hooked up to a Dynatorch 4x8 Super-B

I am having issues with arcing between the side of the electrode to the inside of the tip (also a bit inside the start cartridge).
Will not do it every cut, it appears to happen randomly but when it does I get a somewhat loud "crackling" sound and a VERY nasty jagged cut..
(I have included pics of the arcing)
40 amp consumables, 14ga CR, 110 Inches/min

Air is clean and dry ($600 4 stage desiccant drier that is maintained)
PSI bumped to 90 (was thinking start cartridge may be chattering nit the case)
NEW start cartridge (thermal Dynamics brand)
New shield cup (thermal Dynamics brand)
New electrode (aftermarket)
New tip (aftermarket)
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Brand X
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Re: Needing assistance, Thermal Dynamics Arcing from electrode to tip

Postby Brand X » Sat Dec 31, 2016 9:22 am

Cutmaster 100 is a high freq start machine. Maybe you need to find the bushing that holds the start cartridge in the fire postilion. They have one for when using the one torch on high freq machines.. Some need it, and others do not.. Unless your machine is a cutmaster 101, then it's High freq start..Aftermarket electrodes/tips are generally a bad idea with the one torch.. (IMO) Looks like a copy of the 9-8232 electrode? Has a relief cut right where it's shorting out.(sort of guessing on that one from the pics) Try a real 9-8215 electrode, before you do anything else. Tip too..

LemcoIronWorks
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Re: Needing assistance, Thermal Dynamics Arcing from electrode to tip

Postby LemcoIronWorks » Tue Jan 03, 2017 6:07 pm

Not sure what you are referring to for the "bushing". Start cartridge is OEM and new, I fired it only once and that is what is pictured above.

OEM tips and electrodes arrived today, hoping that does the trick.
Just puzzled that it has been fine with the aftermarket consumables for a year and a half..

I am betting there is a manufacturing problem (tolerance issue) with this batch of aftermarket components.
Wont know till tomorrow if that did the trick or not.

srp
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Re: Needing assistance, Thermal Dynamics Arcing from electrode to tip

Postby srp » Tue Jan 03, 2017 8:45 pm

The first idea I thought of was the possibility of water in the air line. Good observation of Brandx noticing the under cut on the electrode. I also have a high freq start TD machine. My experience with after market consumables hasn't been bad. After the experience of having genuine electrode and only the third or fourth one in a lot working good I tried some aftermarket. So far every one of them has worked great first time and every time. They have a shorter life than the genuine(when working ok) but for half the price I can live with that.

Brand X
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Re: Needing assistance, Thermal Dynamics Arcing from electrode to tip

Postby Brand X » Tue Jan 03, 2017 8:51 pm

There is a bushing made for the the Start Cartridge that hold it into the fire position for High freq machines..It will not come with the start Cartridge. Since you have a later model torch on your older machine, it could help with that issue. Like I said before, not all machines need them, but it sure could not hurt yours..

LemcoIronWorks
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Re: Needing assistance, Thermal Dynamics Arcing from electrode to tip

Postby LemcoIronWorks » Wed Jan 04, 2017 11:50 am

Brand X
OEM consumables took care of the problem, I am pretty sure the cause is that undercut.
From what I have read its the Air pressure that keeps the start cartridge "engaged" while cutting, that undercut may not be allowing the air to keep it engaged. I actually forgot how much quieter the torch is with the thermal dynamics consumables and a much cleaner edge.

SRP
I have been using the same aftermarket brand for about a year and a half with no issues (other than shorter life). I think this last group of electrodes I purchased are out of tolerance or shouldn't have that undercut at all. unfortunately I don't have any old electrodes to see if the undercut is new or not.

Thanks for the feedback, it was indeed helpful!


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