On Thu, 10 Jul 2003 04:43:55 GMT, firstname.lastname@example.org wrote:
=> Now the new data:
=> Start voltage: .7 (will continue running at .5 volts)
=> erratic running!)
=> 12V current: .2 to .3 ma.
=>The current is questionable as quotes from other threads say .5 to 2
=>amps is typical.
=>My goal is to find out if the motor is faulty ! ! !
Doesn't look faulty to me. Looks pretty good, in fact.
The motor rpm doesn't mean much. What you really need to know is whether the
engine is running at something like a protoypical speed at 12V. To find out
if the engine is running within its proper range of speed, do a timing test.
Mark off a section of track that's a multiple of 5ft, making sure you can see
the beginning and end of the timing section clearly. 10ft or more is good.
Time the loco running thorugh it at 12V. Start it a couple of feet before the
beginning of this section If the loco is running at 1ft/sec, it's running at
60 scale miles per hour - which is about as fast as these locos ever went. (A
scale mile in HO is 60.6ft) If it's much faster than this, say 1/2ft/sec,
it's running too fast. At 1.3ft/sec, it's running at 45scale mph -- a little
slow, but not unduly so.
BTW, an eraser is not a good thing to use on a commutator. Use a cleaner -
lubricant like Aerocar's Conducta Lube (part # ACT-3003). You'll be amazed.
Also. what kind of oil did you use? Reoiling the motor and gears with a
different oil than was used by the mfr may actually make things worse. 1st,
the oil may be the wrong weight (esp. if you used the same oil for all parts
of the mechanism.) 2nd, there may be too much. 3rd, the oil may dissolve the
gunk and turn it into grease. 4th, a synthetic oil may not mix properly with
a petroleum based oil. All of these things can add drag, and slow down the
engine. IOW, don't reoil without cleaning first. If you don't want to use
methyl alcohol (I've never had trouble, but YMMV), use a cleaner recommended
for electronic parts.
And never, never use household type oil such as 3-in-1. Use synthetic oils
made for small mechanisms.
Blind River, Ontario, Canada
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