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VaccaRabite |
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En Garde! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 13,479 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region ![]() |
So I went to Home Depot today, armed with some scratch and the will to buy an air compressor and a DA air sander.
HD sells the husky line. So, I went to the tools, found a DA sander (Husky, needed 4cfm @ 90psi, and the box said it would work continously with 20+ gallon compressors). Then I walked over to look at compressors. They had a Husky 24 gallon compressor that flowed 5.1 cfm @ 90 pis on sale ($225). Score! but then, on top of the motor, was a little chart with reccomended tools and non-reccomneded tools. All sanders and DA sanders were non-reccomneded. I called over a HD floor guy, who called over another 2 guys, and we could not see a good reason for the prohibition. But, we decided that if the factory did not reccomend it, then it should not be used as such, and I walked over to the electric tool section and bought an electric DA sander. (IMG:style_emoticons/default/sad.gif) I am going to need to buy a compressor by the spring. I'm clearly in the "hobbiest" catagory, and may not use the tool again for a long time aftyer I am done with my 914, but when it comes time to paint, it will probably be cheaper for me to buy one then rent one - given the slow nature that I work. I want to know why the sander was not reccomended, when the compressor could flow the air and had a big enough tank according to the tool. I have theories, but I thought somone here might be able to give better advice. Thanks Zach |
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DBCooper |
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14's in the 13's with ATTITUDE ![]() ![]() ![]() ![]() Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California ![]() |
The reason that little compressor said it wasn't rated for a DA sander is because of its duty cycle. It may be able to flow enough air to run the tool, but not continuously. Compressors and tools usually list a duty cycles as a percentage, like ten minutes running, five minutes down. The tank should hold enough air, in volume and pressure, to cover the five minutes it's down. If the compressor doesn't get a chance to cool then bad things happen, just like the engine in your car.
NEVER use regular schedule 40 Home Depot PVC water pipe for high-pressure air lines. I know that people have had luck with schedule 80 or CPVC, which is more malable and stays stronger at higher temperatures. But I've also heard about it exploding, too. PVC can lose half its strength with summer heat. and the combination of heat and pulse vibrations from the compressor will eventually cause it to fracture and then explode. In fact I understand that OSHA prohibits PVC in in commercial air line use. If you have any choice at all go with copper, but if you need to plumb it yourself and don't use it heavily or often at least use high pressure rated schedule 80 PVC or CPVC. Also you should probably have an older compressor ASTM inspected occasionally. Most towns will have someone who's qualified to do the inspections. The reason is that condensation will eventually corrode the bottom of any air tank, and once it corrodes all the way through it will go out the roof of your garage like a rocket. That tends to happen at inopportune times, and will be something I guarantee you and your neighbors will never forget, even if no one gets hurt. |
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