[Amps] Suggestions to quiet a blower

[peter.chadwick at Zarlink.Com]

Ed said:

>The second source of noise seems to be a higher pitched noise that I 
*guess* is related to the ball bearing


Ball bearings are noisy. A straight plain bearing would be a lot quieter. 
but if the fan is supposed to be quiet, it may well be plain bearings 
anyway. If not, it could be worthwhile  replacing the ball bearings with 
plain phosphor bronze, or, preferably, oilite sleeves in suitable bearing 
block.

I'm going to a model engineering exhibition next Saturday: there's 
normally trays and trays of various sizes of oilite sleeves going very 
cheap. If anyone has any particular requirements, I'll have a look. You 
can generally ream an undersize one out. Funny, I've seen tools and ball 
bearings and so on in the flea market at Dayton, but never oilite sleeves, 
yet they're common over here in the model engineering shows. Yet at Dayton 
this year, I got a very nice Mitutoyo vernier height gauge  for $15 - much 
cheaper than in the UK.

73

Peter SM/G3RZP