filing the rakers
They do have guides for raker's, but i just use a small flat edge from one tooth to the next and see how much clearance there is from the raker, it don't need much, i don't know the exact measurement, but i would guess about 1/32 is good.
if you take to much the saw will become jerky, jams and hard to handle so now its a hazard. I've done it a couple of times :censored: .
As for as grinders,I don't know if any of you had this happen but, I bought a northern grinder, got it home and mounted it and put the wheel on in the late afternoon so that was it for the day. the next morning I got out to the shop and was going to start sharpening and I noticed the wheel on the grinder cracked up like a spiderweb and when i grabbed it with my fingers it crumbled like it was dried out piece of bread, I brought it back and they replaced it, but I hate to think what would have happened if I didn't see it. So please check your grinder wheel before you start.
Have a great day all,,,tuke