I'm just curious, don't mind me LOL, but how in heck does he maintain the correct angle on the cutter of the saw chain, and how does he control how much material it takes off, meaning like when you file, you count the strokes to insure each cutter gets the same amount taken off and each cutter is even in size ? I have not used a saw chain sharpener machine, just a clamp on bar file guide, Stihl mind you, great for most jobs until you need the machine to true up the cutters, take it to the saw shop for that, towards the end of the life of the chain I usually end up uneven, won't cut straight in large diameter logs.
Just whats shown in the photo looks like you freehand whats to be sharpened, he must have a guide or jig or something. Any of those grinding/spinning wheels can be extremely dangerous if they were to come apart, you have to be careful on RPMS and make sure whatever is spinning is held together but good, especially if you are modifying things, that guard is well short of the wheel, it comes apart there is nothing between you and it. I have an old motor fit up for the purpose of grinding, still attached to the bench in was on in our old ford tractor dealership, in the shop. It has no guard on it at all, not sure of the HP but its overkill, you can't stop it by hand, lots of torque, the motor has oil tubes to lube it like the old Bell & Gosset circulators on hot water heat boiler systems, if a wheel ever shattered off it, be like a grenade going off, needless to say I don't use it anymore and won't until I fabricate an appropriate shield for it.
Most likely he's well aware, and maybe you have more shots of guides, jigs or shields, but if not, the most important aspect of my comments is safety, even if redundant or out of place LOL, see below:
A bit GRAPHIC, even if photo-shopped, and I don't recall where I saved this from, but it still gets the point across about flying pieces and flesh! When I held safety meetings for my crews, photos like these drive the point home, a lot more than words LOL !
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