If you go to Oregon Chains web site they have a section you can download & print everything you need to know about saw chain. They explain what all those numbers mean. It gives all the different filing angles & plenty of diagrams.
I've been grinding stumps for 10 years & sometimes I sharpen my saw 2 or 3 times in an hour so I've had some practice. I always use a file & that might be stupid on my part. I'll still listen to any advice from anybody when it comes to sharpening a saw. The information Oregon has helped me & I'm hard headed & think I know everything.
Oh yeah, that file guide jig you showed the pic of works pretty good but it's slow goin. You can get by using it about every 3rd sharpening. Most important thing of all, keep your saw out of the dirt!!
