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09-05-2014, 06:54 PM | #1 | |
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Looking for lowest viscocity ATF at lower temperatures
Does anyone know of an lube(oil/grease/atf) that has lower viscosity than 3800 cSt at -40c?
^ Primary question ^ For clarity, I am looking for ATF that remains most thin (low viscosity) at low temperatures My application for low viscosity automatic transmission fluid(ATF) is not a car transmission, but a small electric motor that has gears inside that will turn/spin very fast. If you are curious, https://www.youtube.com/watch?v=pH-52IgJui8 here is a video that might give you an idea of what kind of motor I am talking about. Many ATF that I've looked into have viscosities noted at, -40c, 40c and 100c. The inside of the motor isn't likely to get much warmer than ambient temperatures, so a very low viscosity ATF would be ideal. The lowest viscosity fluid I have found so far is http://www.mag1.com/ProductDetails.a...a-55f0b5c590fe this one, mag 1 low viscosity ATF. It's noted to be 28.56@40c(104f). Do you know of any ATF with lower viscosities? I am a little concerned about what viscosity these fluids will be at temperatures below freezing, I imagine it being like churning butter in the motor. Thanks! Last edited by bowlofsoup; 09-08-2014 at 06:59 PM. |
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09-06-2014, 09:07 PM | #2 | |
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Re: Looking for lowest viscocity ATF
Is there any reason you are limiting yourself to an ATF? I'd think a standard motor oil would work fine in that gear set. 0w20 oils are the thinnest that I can think of.
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bowlofsoup (09-07-2014)
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09-06-2014, 11:46 PM | #3 | ||
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Re: Looking for lowest viscocity ATF
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09-07-2014, 12:01 PM | #4 | |
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Re: Looking for lowest viscocity ATF
Is the hub assembly you are working with sealed and designed to hold a fluid? Also, ATF has a bit of a solvent nature to it so you'd want to be sure the ATF will not attack or soften any of the internals, such as nylon gears and seals.
-Rod |
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bowlofsoup (09-07-2014)
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09-07-2014, 06:32 PM | #5 | ||
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Re: Looking for lowest viscocity ATF
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Personally, I am doubtful that ATF will have any kind of negative effect on plastics such as nylon. I think heat is something far more to be concerned with, but I certainly could be wrong. http://www.professionalplastics.com/...ofPlastics.pdf Look at nylon 6 and greases/oils. Most of the types of plastics listed on this chart are labeled as good resistance to greases and oils. |
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09-08-2014, 06:53 AM | #6 | |
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Re: Looking for lowest viscocity ATF
I'm not sure how 3-in-1 oil reacts in low temperatures, but that could be another option for you here as that stuff is pretty thin, at least at room temp.
Is this motor going to be spinning at a faster rpm than what it was designed for or have a much higher duty cycle than designed for? If not, is there a reason you think you need a lubricant if the original unit was not intended to have one? I've been running R/C cars and trucks for years and many of them use nylon gears with no oil or grease. Some of mine are running 54,000 rpms with a brushless motor and LiPo batteries with no problems. The only times I've had issues with the gears melting is when the bearings fail and overheat. I've just recently switched to ceramic bearings to try to alleviate that issue which I've read from others has worked for them when having the same issue as me with a very similar setup. So maybe adding a lubricant to the gear case is not the solution for your application. Maybe sourcing better bearings is where you should focus your search. Here is the site I used for ceramic bearings. Maybe they have something that will fit your application. -Rod |
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09-08-2014, 08:45 PM | #7 | ||
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Re: Looking for lowest viscocity ATF
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No need to try and convince me of the lunacy of this concept. I wrote quite a lot concerning your message originally, spent several hours pondering and researching, the conclusion I came to, putting it cripplingly short, is that I think your RC motor might benefit as much or more from this concept as my hub motor would. Aside from all that, I can assure you, the pros -heavily- outweigh the cons for my situation. I'll give you a few short piece of information that might help sway you in your endeavors and assure you of the value of my own efforts. This is the no load power consumption when the same motor is tested moments apart spinning at maximum RPM. Dry: 76w ATF: 44w Next, imagine your bearings not caked in thick grease likely with some dirt mixed in that got trapped behind a seal, but the bearings open with clean, very low viscosity super lubricating ATF splashing on it and how that might effect their performance. If you wanted ceramic bearings, you probably really like the way this sounds, I know I do. Back to the subject, if you can find me a product data sheet that describes a fluids viscosity that beats(lower is better) 3800 centistokes at negative 40c, I will probably be interested, this is what I am looking for. |
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