rumatt
Super OPE Member
I'm trying to learn how to sharpen chains using my Oregon 620 grinder. If it's cool I'll post pics here to get feedback on what I'm doing wrong and how to improve. I've gotten good results on new-ish chains but I'm still struggling with chains where the cutters are well worn.
Here's an old 325 green safety chain that was rocked so I'm practicing trying to bring it back to life. I have it to the point where it cuts reasonably, but it's a little finicky
1. It doesn't self feed as nicely as I'd like. If I put no weight on the saw it doesn't cut very quickly.
2. If I put a tiny (tiny!) amount of downward force (very slight!) and it rips through the wood quite nicely
3. But it has a narrow sweet spot - if you push just a tiny bit too hard, it bites too much and the saw (Stihl 261) gets into the low RPMs.
My first thought to solve #2 was to lower the rakers, but I think that will make #3 even worse? So what do I try instead?
Here's pics of a bunch of random different teeth. I noticed the one right-hand side cutter isn't nearly hooky enough. But most look pretty decent?
Here's an old 325 green safety chain that was rocked so I'm practicing trying to bring it back to life. I have it to the point where it cuts reasonably, but it's a little finicky
1. It doesn't self feed as nicely as I'd like. If I put no weight on the saw it doesn't cut very quickly.
2. If I put a tiny (tiny!) amount of downward force (very slight!) and it rips through the wood quite nicely
3. But it has a narrow sweet spot - if you push just a tiny bit too hard, it bites too much and the saw (Stihl 261) gets into the low RPMs.
My first thought to solve #2 was to lower the rakers, but I think that will make #3 even worse? So what do I try instead?
Here's pics of a bunch of random different teeth. I noticed the one right-hand side cutter isn't nearly hooky enough. But most look pretty decent?
Last edited: