[modeleng] Re: Electric Motors

I wonder if the better ones have a longer design life?
I would imagine so.
Even so, it is a point worth considering.

All the power tools that I have seen so far seem to have failed due to
battery failure, and often buying a new one is as cheap as a replacement
battery, or the bearing on the spindle fails.

Probably these specific examples haven't been around long enough for the
motors to fail.
alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

www.alanstepney.info
Model Engineering, Steam Engine, and Railway technical pages.


----- Original Message ----- 
From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, September 28, 2004 1:50 AM
Subject: [modeleng] Re: Electric Motors


Conversing with those involved in the design of such motors in the past, I
was told that a lot of the cheap tools are only designed with a working
life of 40 hours in mind before the effect of heat on the motor coils
(which are deliberately underdesigned from the point of view of thickness
of copper wire and insulation coating to reduce costs) causes them to
fail.

As such I've always steered well clear of them for a model which you might
have to totally rebuild 5 years down the line because you can't get a
direct replacement for the short lived motor.


Yours,


Rich.


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