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Got me a Plasma cutter...Now what?

ratdoggy

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Joined
Mar 27, 2009
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Location
Akron-Canton area OH
Picked up a plasma cutter. A Hobart 27i...
Was just playing with it last night for the first time...
I can't believe how well they cut
Any tips and tricks for using one?
I'd like to see some of your projects that you used it on....
 
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TheEquineFencer

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Joined
Jan 15, 2009
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9,278
Location
Farmville, NC 27828
Picked up a plasma cutter. A Hobart 27i...
Was just playing with it last night for the first time...
I can't believe how well they cut
Any tips and tricks for using one?
I'd like to see some of your projects that you used it on....

Yeah, go buy some spare parts for when you try cutting something or the way it shouldn't be done.

Go buy you a strip of 11 or 12 gauge flat steel about 1-2 inches wide to use for a straight edge. Then figure out how far off the edge of it the tip actually cuts.
 

ilovevocs

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Joined
Jun 26, 2009
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1,966
Location
Toledo, Ohio
Can I barrow yours? My ex wife sold mine / stole it through my divorce.

Jacked my Miller 252 too.


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ilovevocs

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Jun 26, 2009
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Location
Toledo, Ohio
C'mon over you're only a 2+ hour drive :)



I appreciate the offer. Enjoy yours and take it with you if you ever move out. Learned that lesson the hard way. Takes a special women to sell a mans welder and his plasma out from under him.


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Brad J.

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Joined
Aug 6, 2015
Messages
70
The cut edge doesn't weld good. Make sure and clean the cut area before welding.

When the consumables get bad it no longer cuts clean. Just replace them. I buy the 5 packs for my hypertherm.
 

brownbagg

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Joined
Mar 20, 2006
Messages
5,208
yes go cut something, go write your name in a piece of sheetmetal, thats always fun.
 

AndeiH

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Jun 7, 2014
Messages
284
Location
texas
ive had my plasma cutter for about 3 years now. it comes in handy now and then but it usually sits on a shelf :sad: .
 

Crusarius

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Aug 22, 2013
Messages
383
Location
Upstate NY
Instead of trying to use a grinder to remove slag after cutting use some type of a chisel. I either use a welding slag hammer, a 4" wide chisel I made for my air hammer, or a needle scaler.

The plasma slag will destroy stones and pads very quickly.
 

FigureItOut

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Sep 14, 2015
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Location
Bentonville AR
Instead of trying to use a grinder to remove slag after cutting use some type of a chisel. I either use a welding slag hammer, a 4" wide chisel I made for my air hammer, or a needle scaler.

The plasma slag will destroy stones and pads very quickly.
It's that true of slag from a torch cut also? I'm guessing the heat hardens it?

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Crusarius

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Aug 22, 2013
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Upstate NY
I don't know about the torch for sure but I would think so. I think what kills it is the porosity not necessarily the hardness.

the air hammer with a 4" wide chisel works great for removing slag. Then an angle grinder with a soft pad to clean it up.
 

Jeeper

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Joined
Dec 25, 2006
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2,124
Location
Round Rock, TX
You can get quite a bit of the slag/dross if you just take a scrap piece of metal use it as a scraper. As long as you do it right after the cut, much of it pops right off.
 

MoonRise

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Joined
Nov 5, 2010
Messages
4,028
Location
NJ
'Doggy......how thick of metal will it cut?

From the Hobart website :D

max output of 27 amps at 92 volts

cut capacity - 'rated' for 3/8" steel at cut speed of 14 ipm

'max' listed cut capacity of 1/2" steel at cut speed of 6 ipm

max listed 'severance' capacity is 5/8" steel

reduce thickness rating up to ~30% for cutting highly thermally conductive materials (aluminum, copper, etc) compared to cutting steel.

As to the OP, ratdoggy, tips?

Use clean dry air (better cut and better consumable life).

Have some spare consumables on hand (Murphy says if you don't have any you will need them, if you have them you won't need them. :spit: ).

Try and maintain a steady travel speed while cutting (once the cut is initiated).

With a 'proper' balance of cutting amps and travel speed (for the workpiece material thickness), there should be minimal slag. If there isn't a 'clean' cut, check settings and practice more (see previous tip about keeping a steady travel speed).

Use PPE and good safety practices. You are dealing with molten metal being sprayed around by pressurized air, after all. Oh, and that plasma jet is somewhere between 5-10+ THOUSAND degrees F (could go up to 20k to 30k degrees depending on actual operating amperage and jet design) in temperature. Keep that in mind, as the plasma jet will cut or damage anything in it's operating path.

More tips at

https://www.hypertherm.com/en-US/learn/articles/basic-tips-to-improve-plasma-cut-quality/
 

MoonRise

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Nov 5, 2010
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NJ
More than I need.....:lol_hitti
But why get something that will just do the minimum?

Absolutely.

example time:

I have a plasma cutter. I have yet to use it to its 'max' for routine cutting.

But I did have to use it to its 'max' when cutting off a suspension bolt. Because of the way the OEM bolt was installed, there was literally no way to physically remove the bolt without either cutting off the bolt or first removing the entire gas tank first.

I chose to cut off the bolt with the plasma cutter. :evil:
 

sberry

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Joined
Jun 18, 2005
Messages
35,747
Location
Brethren, Michigan
Yardsticks and paint sticks work well for straight edges. Make a cut catch can. Saves a huge mess, the spray is fine and really is problematic on the floor.
 

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Crusarius

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Joined
Aug 22, 2013
Messages
383
Location
Upstate NY
I have a 5' long piece of 3/8" steel. I can set the edge of the nosecone on it and keep the perfect distance off the piece I am cutting. makes the tip last a lot longer.
 

R.Anderson

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Joined
May 26, 2012
Messages
906
Location
Wisconsin
It's that true of slag from a torch cut also? I'm guessing the heat hardens it?

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Oxy acetylene torch cut, yes you get about the same slag. Heat hardens it, no. Slag will have some base material in it but most is burnt metal (iron oxide) from being so hot and exposed to oxygen from the torch. Iron oxide and aluminum oxide are harder and are used as abrasives. Most grinding disc, flap discs, and cut off disc are made of metal oxides. So that is why grinding slag off wears the discs out faster.
 
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