Trying to understand dad's grinding angles!!!

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ClintC

C's Tree Needs
Joined
Apr 4, 2011
Messages
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Location
Louisville,Ky
While learning to grind chain, I see that dad seemed to have used a wheel/disk angle of 70/75 instead of recommended 60 on both the 3/8 full chisel (w/no 10 tilt) and 3/8 lp chamfer/semi chisel.
He started tree work in early 80's, so some might call him "old school" in his ways. All I know for sure (through working for him for years w/o explanation of techiniques) is that his chains cut well, but were real "grabby" (he liked to take the rakers down quite a bit when he ground them).
Any insight as to why he did this? My only conclusion is that maybe he would get a little more life out of the chisel.
 
Many people settle on their own custom angles to suit the timber they cut, conditions they cut in and the saws they use.
Saws in your Dad's era would have been a bit slower and with a bit more torque than today's saws which tend to rev higher with more chain speed than bottom end torque.
Low rakers and grabby chain do no favours to anyone in the long run though.
 
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