[MRCA] BC-348 Dynamotor Temp.

[J Forster]

My suggestion was based on ORDINARY room temperature, so my rule of thumb says
roughly 125 to 150 F.

-John



Lenox Carruth wrote:

> After one hour of operation at 75 F ambient mine measures 125 F with my
> infrared thermometer.  The stated temperature rise on the dynamotor label is
> 40 C which is 104 F.  That would appear to mean that, at an ambient
> temperature of 100 F, the dynamotor could run at 207 F and not exceed its
> rated temperature.  This is, of course, too hot for your hand so I don't
> think the hand test is necessarily valid.
>
> FYI, I never run a dynamotor without first disassembling it, cleaning the
> bearings, and relubricating them with an appropriate, modern lubricant.  I
> have never found this to be a difficult operation.  You can remove the end
> bells, hold the dynamotor, one end down, over a tray of solvent and use a
> small brush to clean the bearings.  Don't let the solvent get on the
> brushes, wiring, commutator, etc.  Lubricating is easily done with a flat
> toothpick which will allow you to get the lubricant down between the balls.
> Just be sure you don't use too much lubricant and don't get it on the
> commutator or brushes.  Do the same to the other end and you've got it.
>
> P.S.  I have never found a WW-II era dynamotor where the original grease was
> still good so don't run them without fresh lubrication.
>
> Lenox