DA Problem

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PostPosted: Sun Nov 26, 2017 3:10 pm
Hi Folks,

I introduced myself in the break room, and I already have question.
I have a new IR 328B DA. I just went out to the garage to start stripping the paint off the doors of my project.
I have a Craftsman 6.5 HP, 60 gallon compressor. I have it regulated at 90 psi. About 30' of hose, no kinks.
The sander starts out gang busters, then slows to an almost stop after maybe 15 seconds. I wait a minute, then it happens over, and over...
The sander is oiled. (Which brings up another question; how do you stop the oil that comes out of the exhaust from contaminating the work?)
This sander may use more air than I can keep up, but that's not the problem here.
Stuck from day one...

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PostPosted: Sun Nov 26, 2017 5:44 pm
I'd suspect your compressor. That sander uses almost 30 gallons of air every minute it runs and pulls about 16 cfm at full speed under load. Could be just a new "tight" sander....but I would check those spec.s on that compressor. A lot of times those 6.5 h.p. statements are more like less than 5 h.p.
Oh, and on the oiling thing... we put a few drops of oil in the sanders when we shut the shop down at night then just open them wide open for a few minutes in the morning...that seems to be enough on the oiling....
Metal, wood, fiberglass, we work it all... www.furniturephysicians.com We can restore the irreplaceable!

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PostPosted: Sun Nov 26, 2017 6:04 pm
Hey, never asked....what size is your hose and are you running high flow fittings?
Metal, wood, fiberglass, we work it all... www.furniturephysicians.com We can restore the irreplaceable!



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PostPosted: Sun Nov 26, 2017 7:43 pm
I'm learning a lot the hard way on this project, and I haven't even started.

I never heard of high flow fittings, and the hose is 1/4". I just looked at the specs for the DA, it says use 3/8".

I'll have to look for the model number on the compressor, but it sounds like it's too small.


Maybe 3/8 hose and better fittings will get me going? Sounds like I'll be waiting for the compressor to catch up.

Thanks. :flatten:

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PostPosted: Sun Nov 26, 2017 11:02 pm
It is best to read first and purchase later. Most of us have made the mistake of spending money on something we "think" will do the job, only to end up spending more money to get something that "will" do the job.

The Info Center is a good place to start: http://www.autobody101.com/content/arti ... ould-know/
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PostPosted: Sun Nov 26, 2017 11:28 pm
Yeah, everybody hits these walls of misinformation.... Coronet is right, read, read, read..... Unfortunately, Sears has been one of the worst about overstating compressor performance. They literally made up a way of testing/standardizing their figures to make it look like their compressors were great deals for their output. From what I remember their 6.5 h.p. models were more like real world 3 to 4 h.p. so who knows how much their CFM output really is. You might try and increase you hose, fittings, etc., but I still think you'd have to cut your speed back enough on that DA to make it not a good tool for what you want to do.....
Metal, wood, fiberglass, we work it all... www.furniturephysicians.com We can restore the irreplaceable!

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PostPosted: Mon Nov 27, 2017 8:55 am
Here's the specs on that DA:
Power 0.25 hp (0.19 kW)
Free Speed RPM 825
Pad Diameter 8 inches
Orbit Diameter 5/32-inch
Average Air Consumption 4 cfm
Air Consumption @ Load 16 cfm

The air consumption at load is the critical one and your compressor is woefully inadequate.
1968 Coronet R/T


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PostPosted: Mon Nov 27, 2017 10:58 am
Yeah I just saw that consumption under load spec last night.
Anyone looking to buy a DA? lol :oops:

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PostPosted: Mon Nov 27, 2017 1:34 pm
Common mistake. That is why I wrote that article on what every beginner should know. Much of it I learned via experience. :wink:
1968 Coronet R/T


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PostPosted: Fri Dec 01, 2017 11:37 am
The Oil coming out of the sander may be from the air compressors pump even if new.

I bet that your compressor is actually a 3 hp motor with an 11 cfm pump dual stage if your lucky? even if it was that your DA is an air hog shouldn't kill it so fast.
I am suspecting a problem with the compressor pump evidenced by oil blowing by getting into DA and spraying oil on the project. the piston rings in the pump could be worn out installed wrong or broke?

Does it cycle a lot when in use? high cycle time, taking forever to build up pressure to shut off when not being used, making oil? all signs of a worn out pump.

I am running Two true 3 hp motors turning 2 18 cfm pumps they both had 2 11 cfm pumps when new, both from Steves whole sale tools similar to Harbor freight the 18 cfm pumps are from Polar air they are both worn out now 6 plus years old and I have to put new valves in them both, they don't make too much oil yet but I definitely need new air valves.
My Point is the Tank and the motors have out lasted two pumps each! My original 11 cfm pumps were made of aluminum and were wore out one making oil like crazy and hi cycle took forever to build up the other didn't make oil but took forever to build up wouldn't keep up with the smallest of my air tools.
I have always planned to buy a true 10 hp motor and a True 35 cfm pump from Polar air

https://www.eatoncompressor.com/bare-pumps
Looks like they are having a sale Im gonna have to look at them seriously this time
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.
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