Thanks for sharing, appreciated. Real info, real angles, real experience - gives some facts. Observations are how we know and we can't easily see a chain cutting in the wood. Super slow motion and instant freeze flash photography do give some observations but finding such info difficult. The physical realities of cutting chain has so many interactive dynamics that much knowledge has been simplified into rules of thumb, traditions and myth. THINKING ABOUT THE CUTTING ACTION AND SOME *EFFECTS* OF THE DEPTH GAUGE. Wood strikes the leading edge *forcing it to rock back on its heel,* cutting forces cause the tooth to leave the guide bar and take a bite. In coming back down I imagine the pulling forces through the chain cause _the top of the depth gauge to take on a mirror role of the heel and rivet_ *but as a single point of rotation* _(i.e. it is not the same as the leading edge, heel and its rivet combining to make it leave the guide bar.)_ BUT, if this rotation/pivot back to the guide bar, takes place on a flat depth gauge then I imagine it will be bumpy (think rolling a bolt with a hex head verses rolling a bolt with a round head) If the rotation is on a curved depth gauge then it should be smoother. So _I imagine_ the depth gauge being smoothly curved to give a smoother cutting experience. This will also save energy, wear and tear on parts and reduce hand circulation issues??? This is a pretty easy one to test. Do some cuts with fairly long flat depth gauges, round them and compare the 'chatter'. Everything is fairly easily controlled. I might do it. Vibration is a core safety issue in chainsaw use and I’ve always had poor circulation in my fingers. _I imagine_ there to be a lot of research into what causes chainsaw vibration because of hand circulation issues. Might do a bit of research into it. Cheers sincerely d

It's cool that *something* motivates you to post more videos. I think I can add here that the depth gauges do not normally have to determine the depth of cut, i.e. the thickness of the chips. This is particularly true of the greater cutting length. Their height only determines the *maximum* of the depth of cut. In addition the depth of cut or chip thickness can be greater than the difference between the height of the tooth and the depth gauge. This is because the depth gauges can dig into the wood, especially soft wood. A simple formula can be derived for chip thickness: depth-of-cut = (feed-velocity / cutting-velocity) * chain-pitch * tooth-spacing tooth-spacing is 8 for a standard chain, 12 for (full) skip. I think a more correct definition of the angle of attack would be: The angle of attack is the angle at which the cutting edge enters the wood. Nothing revealing for me, but the video below also contains confirmation of my assumptions about the sharpening of the cutters in the factory. These guys know what they are talking about. There will probably be even more videos. kzfaq.info/get/bejne/hpaEhKt3qaymqJs.html