[TMC] Rotron blower

[Richard Knoppow]

    Axial and Radial are the terms I wanted. Stuck in the mud of 
my memory. Anyway check for play in both axis.

On 9/27/2019 10:20 PM, Richard Knoppow wrote:
>      Just guessing here.
>      First of all what kind of bearings are used, i.e. ball 
> bearings or sleeve bearings.
>      I am assuming the blades are not bent. Can you move the 
> shaft back and forth with your fingers? That should tell you if 
> there is end play and perhaps give a clue about the noise. Also 
> wiggle the shaft around in the baring to see if its just loose.
>      Do you have access to something like a General Radio 
> Strobotac, if so it may be possible to see what is moving.
>     The Rotron fans I have had experience with were small with 
> sleeve bearings of the Oilite kind. I was able to relubricate 
> them using turbine oil. Turbine oil is very highly refined 
> machine oil. About SAE 20 machine oil should work ok.
> 
> On 9/27/2019 9:58 PM, Robert Nickels wrote:
>> I'm looking for tips on noisy Rotron blowers, the one in 
>> question being used in a PAL-350 amplifier.   I was told that 
>> bearing replacement is often needed so I got some new bearings 
>> and replaced them, but the rattly metallic noise continues 
>> unabated. The position of the armature between the end bells 
>> seems to be determined by shim washers in each end, and I kept 
>> the same number in the same place as originally, but is this 
>> something that is tweaked for each motor?    I'm sure I didn't 
>> get the bearings in precisely the same position on the shaft 
>> but assume they move as needed when the end bells are attached 
>> and tightened.   The motor starts and runs fine and produces 
>> plenty of air, it's just this mechanical noise in addition to 
>> the expected white noise of normal airflow.
>>
>> 73, Bob W9RAN
> 
> 

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL