A small sand blast application question.

October 19, 2009

I’m thinking about buying a small, home use sand blast cabinet that says it requires 10 cfm at 100 psi.  I have a 26 gal compressor that is rated for 6.4 cfm at 90 psi.

Would I be correct in thinking that I could probably make this work but only for short periods of time; in other words, if I start blasting the compressor will put out 10 cfm at 100 psi but only for a limited time.

Then the compressor will turn on and try and bring the pressure back up.

Since it’s not quite big enough, it will never be able to continuously operated at the required pressure/flow, but could be operated for short periods of time then pause to let the pressure build up again.

We are only talking about sand blasting some rusty trailer wheel hubs after all.

Thanks, Charles
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Bill says yes…

Hey Charles. Thanks for writing in.

I have a little 1.5 HP air compressor, and I use it to sandblast all the time.

You are correct in that, with a small compressor,  you will only be able to blast for a few seconds before the compressor kicks in.

If your compressor is rated for 6.4  CFM at 90  PSI, then that’s what it will give you.

The issue is, a blast gun will use much more than 6.4 CFM, even at 70 or 80 PSI.  It will drain your tank so fast that the pressure will drop below the point where the sand blasting is doing anything.

That’s why you have to wait for it to catch up. To get the pressure back to the point where the sand will actually take off the rust or paint.

Cheers,

Bill


Air cylinder mounting issue.

October 6, 2009

Whenever possible, use a clevis style mount when installing an air cylinder.

You can have a rear clevis, and / or a rod clevis.

The use of these devices will help compensate for an alignment issue between the air cylinder and the tooling when the air cylinder is cycling.

If the tooling is not aligned correctly with the axial motion of the cylinder, sideloading can result. Sideloading will result in premature cylinder wear and early air cylinder failure.


Puzzled & I need some guidance, please

August 1, 2009

One week ago today, for some reason beyond my understanding, I can no longer reach Google.com from this computer. Every time I try, I get a message telling me that I am “Forbidden” to access the Google server. Hmmmm?

I can access Google.com from another computer in my house that’s using the same internet access point through a wireless router.

I know this blog is about compressed air, but if anyone reading this can offer any insight as to what’s going on, I sure would appreciate it.

Yes, I’ve run virus scans, malware scans, and spyware scans. Yes, I’ve rebooted dozens of times. Yes, I’ve disconnected the router from the circuit. Yes, I’ve tried to flush the and change my IP address. So far, nothing seems to work.

My ISP says it’s Google doing (done) that. Google support re-routes me to a”help”  forum, and that forum has provided no help at all.

Once again, thanks for putting up with this, and if you have any suggestions, I’m all ears! :-)

Thank you,

Bill


Do you fix compressors?

May 19, 2009

I get a ton of questions on my ASK page about where to get compressors repaired.

If your company fixes compressors, why not offer your services to the hundreds of folks that visit my compressed air information site every day?

Post your compressor repair service contact information here.


Now this is neat…an air operated hand!

May 6, 2009

Most of us don’t, or will ever have the need for one of these. Yet if it happened, imagine having a compressed air operated robot hand affixed to the wrist that would allow a person to pick up a can of food, a raw, fragile egg. Outstanding.

Here’s more on the story of the artificial air powered hand.

And if you need information on using compressed air, click here.


Just uncompressing hot air this time…

May 4, 2009

For reasons that have no bearing in common sense, I recently decided that I needed a better computer. If you are a man, then you will immediately recognize that by “better” I meant bigger, faster, more capacity….hoo hoo hoo… you know, a  “Binford X5200 Computer”, fer sure!

I shopped electronically and in person for a couple of weeks, and besides becoming agog with all the features available, one thing popped out as common for all of the new PC type computers. They all came “bundled” with the Vista operating system.  No, it didn’t appear as though the store added the Vista O.S., all of the computers came with it already on board. There was no operating system choice for the consumer. None, at all!

I finally figured out what I needed and could afford, and purchased my “Binford computer”, complete with Vista operating system.

I make much of my living on line. To do that I use a computer, printer, scanner and tons of software that I have accumulated over the years, and all of which worked just fine on the “old” computer, the one running Windows XP.

When I fired up the new unit at home the electronic unpacking process took about 2-3 hours, as the various software packages that came with the new computer vied for supremacy in taking over the operation of the computer. There was more “bloatware” on this new computer than I have ever seen. Not just megabytes of crud, but hundreds, nay even thousands of megabytes of space being used up by the software that I, at this point, had no choice but to accept,  as the computer came to life. Program after program, registration after registration…it went on and on.

Finally the computer’s orgy of software self-indulgence ended, it seemed ready to go, and all I had to now was  install the drivers for my hardware and the various and sundry software packages that I need to make a living.  I was beginning to understand why the computer store wanted $100+ dollars to “get my  new computer ready”.

Oops, according to Vista, my printer drivers were not suitable. Then the computer laughed out loud (not really, just seemed like that) when I tried to install my scanner drivers.  Hour after hour, one piece of software after another was rejected by the vicious Vista. In fact, most of my software (all used to work on XP)  refused to install on the Vista operated machine.

Not only did it use an obscene amount of storage just to turn on the new computer the Vista (Microsoft) operating system, in what appears to me to be a blatant example of planned obsolescence, turned up it’s electronic nose and refused to taste – let alone swallow -  what had been an entirely acceptable feast of electronic tidbits for the XP operating system.

Hmmm? Now, it seems, to satisfy the taste preferences of this $750 computer, I was going to have to spend literally thousands of dollars to buy new hardware, new software, and use a huge number of hours of my time installing all of the new equipment and software.

And then I said, “no way…man.”  I’ll just dump this #$%^@#^%#% Vista operating system, and install my trusted XP. And that’s how I spent my next few days.

Fortunately, the XP software was from the not-so-long-ago era where software companies actually gave you a disc with the program on it so that you,  should you have a computer problem, could actually reinstall the software.

“Aside: first it was manuals that no longer came with  software, and now it’s the software itself. If you want a copy of a software program, and it comes bundled with your computer, then you are out of luck! Talk about downloading the cost of service to the consumer and forcing you to pay for services that should have been included in the price!”

Inserting the XP disc into the drive, I expected the install process to begin. After clicking and whirring for a long time I got…”the blue screen of death”. It seems that Vista doesn’t like being attacked, and basically wouldn’t allow XP to install over it.

Hmmmm. OK, I have a friend that’s involved with computers, and since I’ve already exhausted most of my computer expertise in this venture, time to call in reinforcements. “No problem” says he. Bring it right over. I did.

Three hours later ( and this is a guy that builds computer systems ) he gave up. Nothing he could do would de-install Vista and allow XP to run on this computer.

Now I’ve spent days on the project, and dejectedly, I called the store where I bought the computer and explained my problem. Bless them, they agreed to take it back. Now that is customer service!

Still on the hunt for solutions (I really liked the speed of the newer computers) I visited other computer stores and finally found one that said yes, they could do a drive-wipe and install XP on their new machines, they didn’t advise it, but would do it for persons in my computer condition. A thin $100 dollars and two days later I have another new computer, and when I turn it on…up pops the familiar, and working XP home page.

I suppose Vista is a good operating system for folks just buying their first computer, those that don’t have any other software and hardware they are planning on using on their new device, but I don’t know for sure.

And,  I expect that  it won’t be too many more years before all of the software and hardware extant won’t run on Vista at all, or even, perhaps, on MS’s next, new, wonderful operating system, forcing consumers to upgrade software as the manufacturers strive to generate new sales of software by ensuring that older versions won’t run.

I believe that  MS and the computer manufacturers know that if consumers have only one choice in computer operating systems, then that’s the choice that folks will pick. However, if you have a library of software, if you have a bunch of perfectly functioning and familiar hardware that you like to use, if you are buying a new computer,  then run – don’t walk – from any computer using Vista as an operating system. Unless you want to emulate my very unpleasant experience.

Mr. Ford (of the car fame) taught the lesson to the computer companies it seems. “You can have any color car you want, as long as it’s black” he is reputed to have said. “You can have any computer you want, as long as has Vista” says the computer companies.

How’s Ford doing these days folks?  Can MS and the computer companies, with their arrogant and unreasoning ways in terms of computer choice, expect to be in any better financial shape in the months and years to come as the Ford Company is now?

I think not.


Baking Soda Blast…

April 20, 2009

It’s fairly common knowledge that compressed air is used to “blast” particles at an object to be cleaned.

There’s traditional blast media such a shells, sand, glass, I’ve written about dry ice blasting here, and here’s a new one that’s environmentall y friendly….blasting with backing soda.

Here’s the article.


Two compressors popping breakers…

April 15, 2009

I HAVE 2 AIR COMPRESSORS AND WHEN I START THEM UP AFTER 10 SECONDS THE CIRCUIT BREAKER KICKS OFF, ONE COMPRESSOR IS 17.8 AMPS, THE OTHER IS A 16 AMP,THEY ARE CONNECTED TO A 20 AMP CIRCUIT BREAKER AND I ONLY TRY TO RUN ONE AT A TIME.THANK YOU

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Bill answers…

I guess the question is, why does the breaker pop…huh?  :-)

The breaker will pop when something in the circuit draws more amperage than the breaker can handle.

If the breaker didn’t pop, the increased amperage draw would create heat somewhere in the circuit, and that heat would ultimately result in a fire. So that the breaker is popping is a good thing.

Seems odd to me that you have the same symptom with two compressors.

If it were just one, I would ask you what components in the circuit are electrically driven, and tell you that one or more of them are failing.  The components could be the pressure switch, or the electrical motor, for sure.

That it’s both would suggest to me that you’ve got some sort of electrical fault in the power delivery system.

If it’s not either of the compressors then it’s got to be something between the panel breaker and the outlet box, or a fault in the outlet box itself.

Are you plugging these compressors into the same outlet?

Try plugging the compressors into a different outlet, preferably one that’s connected to a different breaker. What happens then?

If the new breaker pops too, then it’s got to be a fault on the compressors, so you will have to start examining what electrical component on both compressors has failed, or is in the process of failing.

That the breaker pops after 10 seconds would suggest to me that it’s a motor issue. Again, very odd that the same thing would happen with two different compressors.

As an electric motor runs, it heats up. Maybe it’s developing a short when it’s hot, or the load increases to the point that the amperage draw to run the motor against the increasing load is exceeding the breaker capacity.

One other thing; as the tank pressure builds, the motor has to work harder to drive the compressor head and continue to compress air against the pressure that’s already built in the tank. A weak or failing motor may not be able to continue working efficiently against that load, the motor would slow, and get very hot, to the point that it might shut off on thermal overload or create enough heat to short the motor.

If there any electrical folks out there that would like to add a comment to this, it would be appreciated.


Why does my compressor keep running?

April 7, 2009

Boy, I’ve had a significant number of inquiries to the ASK Page of my compressed air information website, asking what might be the cause of their compressor not shutting off.

They know that there is a high pressure cut-off which is supposed to shut off the compressor motor when the pressure in the tank reaches that pressure level. They know there is a problem because their PRV (pressure relief valve) opens and starts to blow down the overpressure in their tank.

Number one: This is a very dangerous situation.

If your compressor’s PRV is blowing, don’t use the compressor until you get it fixed. Heaven forbid that the PRV failed, but if it did, your home compressor has now become very scar with the potential for fatal results.

Number two: If the compressor doesn’t shut off at the high pressure setting, the problem is likely that the pressure switch has failed. Don’t use the compressor until you get this replaced and the compressor shuts off at the right pressure.

Be careful! Overpressurized vessels can rupture with very unhappy results. Get the pressure switch changed out fast.


Notes from the underground…

March 16, 2009

Not a lot to do with compressed air, but a lot to do with air sustainability.

A friend, and a strong proponent for sustainable lifestyles for decades, is putting his money where his mouth is and building an underground dwelling. And he’s not spending a fortune doing so.

Here’s the story. I think it’s well worthwhile reading.