PSN-L Email List Message

Subject: Re: 1 RPM Synchronous Motor
From: "Daryl P. Dacko" mycrump@........
Date: Sat, 05 Mar 2011 12:49:41 -0500

On 3/5/2011 10:47 AM, Geoffrey wrote:
> Is There a possibility the bearing of the drum are frozen ?
> Electric motors will draw considerable current if
> they do not turn.
> As the rpm builds a counter EMF develops which lowers the
> current draw.
> Before you install any replacement motors,
> make sure the drum turns with minimum of
> mechanical resistance.
> I understand WD40 is not right for delicate machines.
> ( don’t understand why)

Those little clock type motors don't draw excessive current if stalled.
Likely the insulation went due to age.

WD40 isn't a lubricant, even if it says so on the can.
It was developed to displace water and clean out crud. (WD40 = water 
displacement formula 40)

I repaired instruments for years and the best all purpose lubricant I've 
used is Tri-Flow.
It's great on just about any delicate instrument, except where a light 
grease is needed.

Just my 2 cent's worth...
Daryl the former instrument tech...


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