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New 4x8 CNC on the way. CNC calls for 5CFM of 100PSI "Dry, oil free" air. We are installing a 7.5HP Quincy with aftercooler and automatic tank drain. Local rep says can get us in the the 80% or better dry range with the aftercooler. Do I need a dryer? I know it would be best to have one but watching the budget at the moment. None of the air from this unit will be for spraying. Can I get away with a smaller dryer/filter/separator at the CNC for such a small volume (5CFM)?
Thanks for any input.
You want you5 air as dry as possible 80% won't do, the last thing you need is moisture getting into you spindle. You may not be in the best position as far as finances might be, but water will kill your spindle on your brand new machine and you will have to pay for the repair, not the CNC mfg. How do you think your finances will be when you have to drop a extra 2500.00 plus to rebuild your spindle.
I can guarantee that Mr. Murphy will come along and at the worse possible time.
Spend a few hundred now to get a good dryer, you won't regret it.
Check with Mcmastercar or Grainger. I boght one a few years back for about a $1000 bucks.cheap insurance
Thanks for your responses. Much appreciated. I had already gone ahead with a refrigerated drier. I wasn't confident that a filrer/separator right at the CNC (100$ option) would get the last 20%. Have a Hakinson drier followed by coalescing oil filter and still putting a cheap filter at the cnc to catch any last bits that mat be in the lines.
Thanks again for the input.
get a large filter and oil filter and put it in before the dryer to keep large crap out
I wondered about that cabinetmaker. Local compressor rep told me to put the coalesing oil filter immediately after the dryer. Said come straight out of compressor (aftercooler), into the dryer (stainless flex line to kill vibration), then through the coalescing filter, then regulate at each drop (175psi out of compressor).
The auto drain line on the dryer is just a small tube. Id've thought youd want to oil out before the dryer also but the dryer manual shows the filter after the dryer also.
I use a 5 micron all purpose filter and oil filter before the dryer to keep garbage from the compressor out
We have a brand new Gardner Denver Rotary Screw air system and don't have the same issues as the old recip, (which was brand new) but the dryer we did have had mineral and welding bits in the water trap causing major problems
Just experience, though.
That's sounding like a good approach. I did find a paragraph in the dryer manual that stated if the drain was clogging to add a sparator between the dryer and compressor.
Compressor is a new quincy but if I can tract down a simple filter it may be cheap insurance.