They never seem to last long and heavier than the air units I was hoping to be able to use.I have the Milwaulkee close-quarters drill and quit using it for woodturning years ago (and save it for drilling - in tight places!) I use two pneumatic random orbital sanders, the Grex with 2" or 1" disks and one from Woodturners Wonders with a 3" disk. I have used those drills off ebay and look-a-likes from other suppliers like Amazon, etc. I know that this isn't the answer you're looking for. If you read through the threads here on the forum concerning sanders, and air compressors, you'll see that a good many people have moved away from air, and invested in either corded electric, or battery powered, sanders, and away from pnuematics. Even at that, you'll need to wait for the receiver tank to condense between cycles, or as I pointed out earlier, you'l have saturated air at the sander. I personally think you're asking too much of your compressor(s) to run a sander on anything other than a very light duty cycle. I have a 17cfm 5HP compressor and it can't keep up with sanders, or die grinders, on a continuous basis. I would be very shocked to see a sander consume only 8CFM continuously. Many manufacturers have an assumed "duty cycle" for a tool, on/off periods, and average out the CFM based on this duty cycle. One other consideration is understanding how Grex arrived at 8CFM. I don t think you would be happy, even with both compressors paralleled. Once both compressors cycle a few times, you're going to have saturated air at the sander, which isn't a good place to be for the sander internals. You could parallel both of the compressors and have additive airflow, but it would still be very short lived even at that. What is the capacity of the 30 year old compressor.
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