Quote:
Originally Posted by Ed Northrop
Tom when you say undercut by hand so the insulation is just under the bars. Can you explain that to some one that not sure what you mean.
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I start at the outer edge to get a good bite between the bars, then slant the saw level as I cut away the insulating material between the bars. The ATLAS saw only costs about $2 and cuts on the backstroke, not the forward stroke. Go slow and working under a magnifying glass helps. I wrap duct tape around half the saw so it's more comfortable to wrap my hand around while cutting. Polish with crocus cloth after the undercut, in case the saw slips and puts a light scratch in the bars. Remember it ONLY needs to be undercut about .007 to .010" of an inch.
This is the same armature from the rusty housing. Notice that there is a slight bit of wear showing on the bars, but there is a lot of wear left on the brushes, so I'll just polish the commutator with some fine crocus and reuse the brushes. Only the adjustable brush is worn enough to need replacing, but I remove that brush anyway when I install the EVR.