I’m using CPM 154 for the first time. (I’ve used 440c several times.) While drilling holes in two knives I had some fumes. I don’t wear a mask while drilling. I went from drilling to grinding out the profile ( I did put the mask on for grinding). I spent a couple hours grinding. Then went in the house to take a break and I found my voice was almost gone. Kind of like a severe cold voice. I feel fine I just have voice issues. Anybody know if fumes from stainless steel caused this or maybe it’s a coincidence? I know galvanized steel can cause problems. What about stainless? Either way, I believe the mask will go on even for drilling holes now.