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| Agilent 34410A Noisy fan |
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| HighVoltage:
--- Quote from: engineer_in_shorts on July 27, 2014, 01:37:00 pm ---i think i have found it, page 14 on this PDF: http://www.ebmpapst.us/media/content/products/downloads/DC_fans_specials_2011.pdf --- End quote --- I just looked through my boxes and found the right one for the Agilent E3640A PSU It is the PAPST Type 612MI This one is 25,3 mm thick and 60 x 60 mm outside dimensions See enclosed pictures. Right next to the cable is the Thermistor for this fan. I have installed this PAPST type fan in several Agilent PSU and never had a problem with them. |
| rob77:
just one note regarding the oil... i'm sure the engine oil (virtually any lubricant) will work. but i'm using silicone oil because of it's properties: 1. non corrosive 2. clean , transparent and odorless 3. it's a fairly good lubricant 4. it's not conductive |
| SeanB:
I have done a fair number of fans where you could not replace them easily ( cost, availability and lead times) and the drop of oil worked for a long period, often months or years. Silicone oil is not the best lubricant in a bearing, as it tends to polymerise with time and with temperature, turning into an abrasive. As well the breakdown product is silicon dioxide, AKA sand. Mixed with carbon based oil and you get as a breakdown product silicon carbide, or grinding paste. The engine oil is light enough to lubricate, but thick enough that it will stay put in the bearing, providing a nice hydrodynamic film to reduce the friction between the sleeve and the shaft. It likely is also the original oil as well. Oilite bushes are typically prepared during manufacture after sintering by dumping them hot into hot oil which both cools them and impregnates them with oil. A lot these days seem to be made from leaded steel powder pressed into a bush then sintered, must be cheaper than bronze or brass powder. |
| rob77:
agree with all you wrote... but think of the plastic sleeves and the engine oil ;) silicone oil is used for lubrication of small parts (low temperature, low stress) surrounded by plastics for a good reason ;) the engine oil is designed to lubricate metal parts in a high temperature environment, it might easily contain additives which are aggressive to the "low quality" plastic used in electronics. and last but not least - who has some engine oil handy in his lab ? if someone is doing machining along with electronics, then he might have some cutting oil or even engine oil handy.. but otherwise... ;) |
| SeanB:
Engine oil is quite common as a lubricant, used for bushes on open switches in older equipment. There you just need a drop, so I use a 5ml syringe to keep it around. I also keep some synthetic grease around for the same reason. It makes a very nice reconstitutor for dried up thermal paste if you just are taking a part off and putting it back. |
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