RE: (ET) mower blade runout

["Elie, Larry \(L.D.\)" <lelie ford com>]

I am guessing a bent armature shaft.  I have had these several times.  It 
looks ugly, is 
noisy, and takes more current than normal to cut as you end up cutting at 
two heights with 
that blade.  I think it comes from hitting something HARD.

It can be fixed.  I've done it.  You need to pull the armature out, and 
take it somewhere to 
straighten.  Or, if you have access to a heavy lathe with a good collet 
and a dial gauge, you 
can fix it yourself.  Mount the most bent end (the bottom shaft) in the 
collet.  Lock the lathe.  
use the dial gauge to determine the angle of the bend.  Rap the armature 
with a mallet--hard.  
Spin and repeat until the dial gauge is showing 0.0015" runnout.  Re-mount 
the armature.  You 
may have to get permission to be this hard on a good lathe, but it works.

Larry Elie


-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu]On Behalf Of Thon Basom
Sent: Sunday, September 12, 2004 5:54 PM
To: elec-trak
Subject: (ET) mower blade runout


My recently acquired--and sadly neglected--12M now moves under its own 
power
and spins the mower motors when asked to.  ;-)
I put new blades on the mower and spun the blades by hand to see how much
runout was present.  Easily a 1/4 to 3/8", at the blade end, on at least
one.  I imagine lots of places this could be coming from:  deck not level,
bent motor shaft, top of hub not perpendicular to shaft.  So I wonder how
close your blades are to a single plane, how much off is 'too much', and 
how
most easily to start figuring out which component is at fault?
Thanks.
Thon
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