"Steve B" wrote in message
news:NvEXf.1640$I%6.1427@fed1read12...

If that was the case, wouldn't commercial loggers do that? They seem to
have tried and true techniques for sharpening saws. IIRC, they just carry
extras, and slap a sharp one on when the other goes dull. They do have a
lifetime, and can be resharpened to a point where a new one is the only
answer.

Simple solution:
1. Buy a round file to fit (new one every year) and
a holder for it (marked with diagonals at 25, 30 and 35 degrees.)
2. Sharpen your own blade either every morning or every time
you refill the gas tank: 16 strokes on each tooth does it, quite
fast if you steady the saw on any object with parallel lines.
3. A sharp blade removes small square chips of wood, a dull
saw only sawdust. When your resharpened chain fails to
produce chips, buy a new one.

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)