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| Corrsion on Motor shaft |  | ||
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| Posted by: blake51 ® 10/16/2009, 12:12:08 Author Profile eMail author Edit |
I am working with a vendor that builds air conditioning units for us. We have seen a problem with surface corrosion on the motor shaft, the shaft is made of 1141 carbon steel and the fan hub that goes onto it is cast aluminum.
These air conditioning units are used as part of a military system so they are subjected to the worst enviornmental conditions (rain, salt, dust and high/low temps). The vendor has said they can nickel plate the motor shaft and also if needs be hard anodize the aluminum fan hub. What do you all think of just nickel plating the shaft and leaving the hub? Would that be enough? Or would the anodize also be needed?
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| Posted by: AVIB ® 10/21/2009, 12:16:17 Author Profile eMail author Edit |
Hi,
If the Hub has no protection , make the anodize . Regarding the shaft , Go to Stainless steel and forget the problems . With the nickel plating you are entering prblems of THK. etc. AVIB |
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| Posted by: Marky ® 10/19/2009, 08:03:03 Author Profile eMail author Edit |
Hi and welcome to the forum. I'm going to throw this one out there....Can you look at Stainless Steel for both parts? Not knowing what the parts look like...the cost between Steel/Nickel Plate and Alum./Anodize vs SS may be a wash. I've used the same materials in a Fluorine gas laser...one of the most harshest gases in the world and ended up redesigning parts to be SS. I found that one imperfection in the plating created some corrosion. Hang in there...you should get some good feedback. |
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| Posted by: wwdaugherty ® 11/04/2009, 14:25:11 Author Profile eMail author Edit |
Hi, I am new here and just browsing through many posts and your 'flourine gas laser' caught my eye. I worked on many CO2 gas lasers and was just wondering... "what wavelength does this medium lase at?" I never hear of such a corrosive gas being used. Must have a very unique and desirable wavlength. Military program? Bet that system is a bear to seal.... |
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| Posted by: Marky ® 11/04/2009, 14:46:50 Author Profile eMail author Edit |
Hi and welcome to the forum. We used the fluorine in excimer lasers...yes it was nasty. It lases at 157nm. Not alot of military uses...mostly medical. Eye surgery etc... Lots of nickel plating..ss fittings and usual a magnetic coupling to drive the fan inside of the chamber. Are you still in the laser industry? |
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| Posted by: wwdaugherty ® 11/05/2009, 07:38:58 Author Profile eMail author Edit |
Kinda sorta. I worked for a company that designed and built lasers for military use (ranging and targeting). I left two years ago and now work for another military contractor who builds missiles for the military. It is precision opti-mechanical and literally a blast !! Quite the challange with the whole deal, mainly building to cost in today's economy. Glad to have found this group. I was doing a search on the effects of MMC tolerance bonus on threaded holes when I found it. One of the things that I do (I am a checker) is study tolerances at assembly and analyze their impact. Like I said, you can build anything, but when you want to do it cost effectively, you had better do it smart !! Glad to make your acquaintance.... Do any of you fellows play in Linked In ?? I started with that to help network and find employment when I was laid off... So far it has been good..
http://www.linkedin.com/in/wwdaugherty |
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| Posted by: Kelly Bramble ® 11/05/2009, 08:36:59 Author Profile eMail author Edit |
wwdaugherty, I just sent an invite to you on in Linkedin. Looking at your employment background - our paths have crossed close if not directly. Kelly |
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| Posted by: Marky ® 11/05/2009, 07:59:57 Author Profile eMail author Edit |
Hi Bill...This is the place to come if you need help or even if you'd like to help. If we can't help...we'll point you in the right direction. Checkers are a dying breed and the unsung hero of engineering...I used to love to do it. |
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| Posted by: wwdaugherty ® 11/05/2009, 09:29:25 Author Profile eMail author Edit |
One reply to both Kelly Bramble and Marky. Thanks for the kind words and welcome. Hahaha.... I very rarely have good words said to me as a checker... Mostly the four-letter kind... (it is a given that all checkers are evil...) I am not sure as to how much I might be able to contribute, but if the occasion arises and it seems my comments might be meaningful, I promise to not be shy... |
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| Posted by: blake51 ® 10/19/2009, 08:38:08 Author Profile eMail author Edit |
Stainless steel is an option for the motor shaft, but cost is greater. SS is not an option for the fan hub though. I am concerned about the Nickel plating because the fan hub has a set screw that will be penetrating it, this could cause an imperfection in the plating like you said. Another concern I have is dissimilar metals, or galvanic corrosion. Going from a carbon steel on aluminum to nickel plated steel on aluminum looks to be worse on the chart to me.
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| Posted by: AVIB ® 10/21/2009, 12:58:28 Author Profile eMail author Edit |
Hi ,
Forget about the cost . You will pay more with the plating option . Adding a process costs more and then comes the issue that the Purchasing Dpt. will try to reduce the plating cost and will give the plating job to another vendor ..... and now you are in trouble . P.S. Anodize to Cast Alum. is tricky !! Make samples and test them first . I wish you Luck . AVIB |
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