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Compressor

Hi.
With the mechanical work well on its way on my HZ Panelvan project, the time has come to begin to look at bodywork, I'm interested in learning and doing as much of it myself as possible so I figure I need a compressor, some prelim investigation has left me fairly lost, it seems fairly random how these things are measured, CFM/PSI/HP/Duty Cycle so on and so forth, What I'm looking for is a decent recommendation for a good quality compressor for use spraying, I will be spraying the whole car, and as its windowless, theres large areas that need spraying all in one go. I would assume that a compresser with the capacity to spray properly will also run most decent air tools?

Thanks
-Adam

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A 15 CFM compressor is about what you need, which runs on about a 2.5 HP electric motor, you could get away with a slightly smaller one but I find the bigger the better with compressors, to go bigger than about 17 CFM you start getting into ones that run on 3 phase power.

Holden Parts For Sale, www.holdenparts.tk

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CFM (cubic feet per meter) PSI ( pounds per square inch)Duty Cycle (is the amount of load before the motor cuts out)

Whoever mentioned duty cycle is a wanker,sounds like someone is pissing in your ear.

There is no way the duty cycle would ever cut out on a compressor (unless it goes to a short somewhere).

Mcmillan make great compressors,but depending on what you are going to use it for,a cheaper one may suffice.

If it will only be used occasionally I would buy a cheapy.

You can get a 16 cfm for about $300.00

If it is going to be used daily get the Mcmillan,as these are easy to find parts for,and worth the extra because of longevity.

As for PSI any 16 cfm compressor will produce 120 psi,and when you consider that air tools only require 100 psi,120 is plenty.

What you must do is time how long it takes from empty to fill the tank.

3 mins is ideal any longer and you will forever be waiting on the compressor to catch up.

As for the air tools a 16 cfm will struggle anyway,tank sizes really need to be much much bigger in order to keep up.

I don't know what air tools you use but say it is an orbital,then you will get about 5 mins before you have to stop and let the comp catch up.kik

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duty cycle is how many operating minutes compared to how many minutes turned off.eg 100% duty cycle means that the compressor is capable of operating continusly.go for at least 15cfm,preferably 17cfm(which in the case of my ingersol rand pump,was just a pulley change!)

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Not sure what your point here is.
Most modern windings have a duty cycle.
In the case of the transformer in a Mig if you run it at a constant rate
at full bore it will cut out, I have a WIA Mig and it's duty cycle is 20 minutes at rated output IE:full bore.
As for compressors we are only talking about a single phase motor,if it ever cuts out without going to a short it should never be there to begin with.

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the cut out on your welder & on a compressor motor is a thermal one,designed to stop the windings overheating,it doesn't measure current in any way,the reason your welder stops after a few minutes is that things start to warm up inside(normally the thermal cut out of a mig senses the temp of the diodes).lots of things can make a motor cut outwithout having any internal problems.even an extension lead thats too long!electric motor duty cycle also relates to how many times the motor can start in an hour,so the whole duty cycle thing does have some relevance

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