Hi Guys!
As you may know, I recently acquired a Stihl Rapid Duro carbide chain for cutting old, hard, dried-out bluegum. It really works splendidly for this application. That is, until I ran over a flat stone under one of the logs I was bucking... I was fortunate in that none of the teeth chipped, but the rock did "flatten out" the leading edge of the cutters on the top plate. See below for the "before" image...
![stihl_rapid_duro_carbide_chain_before_edit.jpg stihl_rapid_duro_carbide_chain_before_edit.jpg](https://cdn.imagearchive.com/arboristsite/data/attachments/434/434614-01ec4994f765b429a410327a0d1cec46.jpg)
Yesterday I spent over 2 hours
restoring the chain on the grinder with my diamond wheel. I took a photo before grinding, and one after grinding. Interestingly, there is a slight difference in the side profile now. Whereas the original grind left the very top egde of the cutter in the "lead" so to speak, my grind left the edge below "in the lead". See below for the "after" image...
![stihl_rapid_duro_carbide_chain_after_edit.jpg stihl_rapid_duro_carbide_chain_after_edit.jpg](https://cdn.imagearchive.com/arboristsite/data/attachments/434/434615-52492643daeb8cbb96930d40810063af.jpg)
Q.1 Do you think having the working edge below the top edge will harm performance?
Q.2 If so, what adjustments can I make in the grinding procedure to restore the profile to factory settings?
Grinding angles used were 75/30/0. I subsequently found another thread on the forums which quotes the angles as 65/25/0, so this could have contributed to the problem. I did find that there was very little room in the gullet, and the grinding wheel kept touching the depth gauge on the inside...
Any help will be appreciated!
Mike
As you may know, I recently acquired a Stihl Rapid Duro carbide chain for cutting old, hard, dried-out bluegum. It really works splendidly for this application. That is, until I ran over a flat stone under one of the logs I was bucking... I was fortunate in that none of the teeth chipped, but the rock did "flatten out" the leading edge of the cutters on the top plate. See below for the "before" image...
![stihl_rapid_duro_carbide_chain_before_edit.jpg stihl_rapid_duro_carbide_chain_before_edit.jpg](https://cdn.imagearchive.com/arboristsite/data/attachments/434/434614-01ec4994f765b429a410327a0d1cec46.jpg)
Yesterday I spent over 2 hours
![stihl_rapid_duro_carbide_chain_after_edit.jpg stihl_rapid_duro_carbide_chain_after_edit.jpg](https://cdn.imagearchive.com/arboristsite/data/attachments/434/434615-52492643daeb8cbb96930d40810063af.jpg)
Q.1 Do you think having the working edge below the top edge will harm performance?
Q.2 If so, what adjustments can I make in the grinding procedure to restore the profile to factory settings?
Grinding angles used were 75/30/0. I subsequently found another thread on the forums which quotes the angles as 65/25/0, so this could have contributed to the problem. I did find that there was very little room in the gullet, and the grinding wheel kept touching the depth gauge on the inside...
Any help will be appreciated!
Mike