Most Durable sharpening,

[max88]

What grinding angles on a semi chisel chain and full chisel would give the most dirt resistant chain. Im grinding with and oregon 520 grinder and CBN wheels.
Kind regards from Denmark Max

 

[hwrdpromac7900]

I sharpen all my chains 60/30/0. Have had great results.

 

[max88]

Yes. I've just thought 70/30 or 80/30 might put a little more meat behind the edge.

 

[user 122190]

Keep it out of the dirt and sharpen often. Fine tuning it depends on you and what you are cutting, maybe. I stick to factory and sharpen often.

Years ago we had a user who played with the angles, and his 70+ was a maniac in wood, but dulled real fast.

 

[cookies]

Higher quality chain makes a big difference in edge retention, if cutting dirty stuff bring water to wash it off or wait for rain. Changing angles might extend sharpness but it will not matter when it takes longer per cut.

 

[huskihl]

Anything closer to 90/0 will be more durable but cut slower. If it’s that bad, try 70/20 with semi chisel and lower the rakers down to get it to feed

 

[firekindler]

For some years now, I've been filing chains for that purpose at 25/0. I cut dirtyish wood on a regular basis, which prompted this modification from the conventional. I use 3/8 chain exclusively. Shifting to 1/4" files allows me to get the "lack of hook" side profile I seek, which holds up better in grittier conditons without having to follow up and clean out the gullet with another pass to pull decent chips in cleaner wood. It cuts a little slower in pristine conditions, but those are not that common for me. In the long run, I get more production with less sharpening time. I still need a 7/32" file for the first filing, to modify the angles and still actually fit between the cutter and raker. That's a pain in the butt, but necessary to achieve the longer term goal.
Hope that makes sense. Hit me up if you'd like clarification.