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85a consumables on 65a plasma cutter

whateg01

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We have a PM65 at the local makerspace On a CNC table. Somebody has started that you can't use 85a consumables because it's only a 65a per supply. I remember when I was running my thermal dynamics 40a machine, it was generally preferred to use 60a consumables because they would last longer. Is that not true of the hypertherm machines?
 
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Bodj Built

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I don't have a definitive answer for you, but if it fits and cuts fine then I wouldn't worry about it. I wouldn't put a 65a consumable on an 85a machine, though.
 

Fixr

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I don't have a definitive answer for you, but if it fits and cuts fine then I wouldn't worry about it. I wouldn't put a 65a consumable on an 85a machine, though.
Lower amp consumables can typically cut a narrower kerf when used at current settings within their range. I have two sets, one for fine work on thinner material and another for bigger cuts.
 

Fixr

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They are "warning" others not to do it because it won't work. I just don't think that's true.
Assuming the consumables actually fit, the worst I can think of would be that the plasma might not be focused perfectly. It's not going to kill the machine or a bus load of nuns holding orphans.
 

KwikFab

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You can use them, but the orifice will be larger thus giving you a different kerf and affecting the dimensions of all your cut parts.
 
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whateg01

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You can use them, but the orifice will be larger thus giving you a different kerf and affecting the dimensions of all your cut parts.
That's what I experienced on my CM40. Or maybe it was a CM42. either way I never had any problems running it that way so it seemed strange that this person is advising people against it.

I don't have any really data, but it does seem like consumables lasted longer that way.
 

Fixr

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That's what I experienced on my CM40. Or maybe it was a CM42. either way I never had any problems running it that way so it seemed strange that this person is advising people against it.

I don't have any really data, but it does seem like consumables lasted longer that way.
Some people are into rigidly following recommendations as if they were holy commandments. Learning and understanding some basics about how a thing works can open up possibilities.
 
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whateg01

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Some people are into rigidly following recommendations as if they were holy commandments. Learning and understanding some basics about how a thing works can open up possibilities.
Well if there's one thing I have learned from GJ, it's that everybody has an open mind!
 

KwikFab

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That's what I experienced on my CM40. Or maybe it was a CM42. either way I never had any problems running it that way so it seemed strange that this person is advising people against it.

I don't have any really data, but it does seem like consumables lasted longer that way.

There's a possibility of that, due to the narrower flame and larger orifice.

As you know, nozzles and electrodes are consumables and the opening on the nozzle does indeed get bigger the more often you use it. Whether it's cut time, pierce count, or amp setting.
 

Jack Ryan

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The consumables should match the current being used. Using over sized consumables causes the plasma to be less focused and not properly rotating resulting in a less precise and less clean cut.

However, if your tool is a plasma axe, it probably doesn't matter.

Jack
 

KwikFab

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The consumables should match the current being used. Using over sized consumables causes the plasma to be less focused and not properly rotating resulting in a less precise and less clean cut.

However, if your tool is a plasma axe, it probably doesn't matter.

Jack

Not quite - consider the fact that (for example) 30 amp consumables exist for 60 amp machines. Same with 50 amp or 40 amp.

The goal is to not run an amp setting that exceeds that of what the consumable(s) are rated for.

These lower powered sets are to allow one to gain a smaller kerf, running at a lower amp setting versus running at max.
 

Jack Ryan

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Not quite - consider the fact that (for example) 30 amp consumables exist for 60 amp machines. Same with 50 amp or 40 amp.

The goal is to not run an amp setting that exceeds that of what the consumable(s) are rated for.

These lower powered sets are to allow one to gain a smaller kerf, running at a lower amp setting versus running at max.

As I said, match the current being used.

If you are using 40A, use 40A consumables. Don't exceed the consumable current either.

Jack
 

KwikFab

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As I said, match the current being used.

If you are using 40A, use 40A consumables. Don't exceed the consumable current either.

Jack

Gotcha - misunderstood one of your statements.

Yeah running at the amp setting, or lower, is common throughout all plasma cutters in general.

The same would apply to the author's situation of an 85 amp-rated consumable on a 65 amp machine.
 
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