I have decided on a Miller Spectrum 625 Extreme or 375 Extreme but have a few air source questions. I would rather get the 625 Extreme as it's only $300-$400 more but don't want to have to buy an $800 compressor right now. I plan to only cut up to 1/4" steel in 6" lengths and probably alot of 1/8" steel in 2-3 foot lenghts at the time.

1. How long will an 80 cf tank of nitrogen last? Is there a way to calculate this?I have decided on a Miller Spectrum 625 Extreme or 375 Extreme but have a few air source questions. I would rather get the 625 Extreme as it's only $300-$400 more but don't want to have to buy an $800 compressor right now. I plan to only cut up to 1/4" steel in 6" lengths and probably a lot of 1/8" steel in 2-3 foot lengths at the time.

1. How long will an 80 cf tank of nitrogen last? Is there a way to calculate this?

2. Are there any disadvantages to nitrogen other than the cost?

3. Can I get by with a smaller cfm compressor on the 625... say 4 or 5 cfm? I'm assuming that you would need 6 cfm + 20% for to get the maximum rated cuts (5/8) right but not with the cutting I'll be doing. I have a 2.9 cfm compressor now.

Thanks for the help.

1. How long will an 80 cf tank of nitrogen last? Is there a way to calculate this?I have decided on a Miller Spectrum 625 Extreme or 375 Extreme but have a few air source questions. I would rather get the 625 Extreme as it's only $300-$400 more but don't want to have to buy an $800 compressor right now. I plan to only cut up to 1/4" steel in 6" lengths and probably a lot of 1/8" steel in 2-3 foot lengths at the time.

1. How long will an 80 cf tank of nitrogen last? Is there a way to calculate this?

2. Are there any disadvantages to nitrogen other than the cost?

3. Can I get by with a smaller cfm compressor on the 625... say 4 or 5 cfm? I'm assuming that you would need 6 cfm + 20% for to get the maximum rated cuts (5/8) right but not with the cutting I'll be doing. I have a 2.9 cfm compressor now.

Thanks for the help.

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