b'\x1b\x1a\x19 \x1f\x18\x1d\x17\x16Ask the Grinding Docinstead of air (oxidation requires ox- a separate cooling nozzle at thereduced or even eliminated those ygen), and 2) the trailing edge of theoxidizing region on the ungroundbrown, yellow and blue marks, Joe wheel ground away any oxidationsurface. the Grinder might be tempted to burn that did develop. Heat con- This works for two reasons: 1) Itsay, Hey, Bud, look. Grinding burn duction caused high temperaturesreduces temperature, slowing thatis gone. Lets crank up those feed (but not very high) on the ungroundoxidizing chemical reaction, andrates. Now youve got genuine side surface, where we didnt grind2) it starves the region of oxygen.thermal damage, but you cant see it away. Hence, we see oxidation(Air is 20% oxygen, and coolant hasit. There are no brown-yellow-blue burn on the unground surface. close to 0%.) The figure, pulled frommarks, just a severely weakened You want to get rid of that ironThe Book of Grinding, explains. steel. Its a clean yet damaged work-oxide oxidation burn, but how?But be careful. Now that youvepiece. Thats a bad situation.CTESince it begins at such low temper-atures, youre going to have a hell of a time using the regular methods ofabout the author reducing grinding temperature Jeffrey Badger, Ph.D., is an independent grinding consultant a sharper dress, a different wheel,who has resumed his popular three-day High Intensity improved mainline cooling, etc. InGrinding Course. For dates and locations, visit www.fact, theres only one way to reduceTheGrindingDoc.com.or remove oxidation burn: Direct GORILLA MILL TO LAND NEW PRODUCTS AT HOUSTEX 2021you are hereGorilla Mill returns to the SME tradeshowevents in 2021 starting with Houstex. Make sure to visit us atBoof 1401for all the latest and greatest tool offerings and technology. You never know what youll discover!gorillamill.com262-549-5940toll free 866-888-9600 16SEPTEMBER 2021 GrindingDoc.indd 16 8/17/21 11:40 AM'