I used the new Timberline saw sharpener for two weekends now, with 12 times sofar and counting, have to say it works good. I think it sharpens better and more consistent then anything out there, better then the Granberg round stone grinder, better then the topical Oregon flat stone grinder. Couple reason why, the Granberg works good but that small stone loose diameter as it goes around the chain, especially long chains and heats the teeth. Flat stone grinder if looking at the tooth close it creates a flat grind on the tooth, oh it's sharp but flat sharp on chainsaw tooth IMO is not as good as a slightly round sharp grind and again flat stone grind still creates heat.
The Timberline solves all those issues that I think are issues, starting with a cool grind, a slightly round grind, a more constant consistent precise grind from a razor sharp carbide cutter. BUT I do have a couple issues though, 1> No motor on it hand powered only, guess tiny slow turning motors cant be made... 2> Then I dont think theres quite enough travel room to pull carbide cutter out to move chain, pull to much and it comes out then be sure not to drop, pull out not enough and when turning chain the tooth bangs into cutter... 3> Once the saw chain is down a little those tooth stop dogs cant be flipped over to do other side without first unscrewing the adjustment knob all way back, I'd rather just pull cutter out, flip stop, insert cutter and turn knob in or back slightly if needed.
What I find works good is when trying out on used chain, start with longest tooth first, bring in easy so just to get the cutter shape, then snug up good for next go-round, I had to go around 4 times to get all teeth same length, I had one tooth that got ding so didn't go back to that one but getting close now after several sharpening's. Then do same thing on other side, then the next time chain needs touch up set the sharpener so it just brushes the teeth and it comes out razor, The shapener comes with how to set on bar by finding balancing point, very easy set up.
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