Re: (ET) one blade not cutting well

[David C Robie <mycroftxx1 juno com>]

How the heck are you gonna get a clamp on meter to read DC?    I have an
old fashioned handheld  'generator and starter'  tester that reads the
magnetic field through a DC wire, but it is not accurate. couldn't
discern less than 5a or so difference.  

Dave
Weymouth MA



On Tue, 25 Jul 2006 09:47:03 -0400 Klein Robert W NPRI
<KleinRW Npt NUWC Navy Mil> writes:
> Through a clamp-around amp meter on each of the leads motors while 
> running.  I bet you'll find you have a tired armature.
> 
> Robert W. Klein II
> SSGN Deputy Technical Manager AWS/AWSS
> 1176 Howell Street
> Newport, RI 02841
> Phone: 401-832-1948
> Toll Free:  1-800-669-6892 Ext. 21948
> FAX:  401-832-7877
> e-Mail: kleinrw npt nuwc navy mil
> 
> 
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu 
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Michael 
> S Briggs
> Sent: Monday, July 24, 2006 4:07 PM
> To: elec-trak cosmos phy tufts edu
> Subject: (ET) one blade not cutting well
> 
> 
> 
>       With the gator blades on (and even when I put the original 
> blades 
> back on), the far right blade on my E15 was not cutting well. It 
> seems 
> that the motor wasn't spinning that one fast enough, and with the 
> Gator 
> Blades, the slow speed resulted in grass accumulating in the "teeth" 
> on 
> the backside of the blade, eventually stopping it from spinning 
> altogether 
> (which then resulted in lots of grass building up around the blade).
>       I swapped all of the gator blades out for the regular 
> Elec-Trak 
> blades, and it cut somewhat better since it was at least spinning 
> that 
> right blade, and it couldn't accumulate grass in it, but it still 
> didn't 
> really cut the grass much - apparently spinning too slow (also the 
> Gator 
> Blades used quite a bit more power, especially as the grass built up 
> in 
> that blade, and I a couple times had the other mower motors shut off 
> due 
> to the thermal breaker cutting out).
>       So - I need to figure out why that blade isn't cutting 
> well. It 
> seems that the motor for some reason just isn't spinning it fast 
> enough. 
> What could be the cause of this? Perhaps worn brushes (but not 
> *completely* worn such that it doesn't spin at all)?
> 
> Thanks,
> Mike
> 
> -- 
> 
> --------------------------------------------------------------
> Michael S. Briggs
> UNH Physics Department
> (603) 862-2828
> ---------------------------------------------------------------
> 
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