How to sharpen square baler knives. . To find out the angle of your blade, ask the manufacturer of your knife or inquire at a knowledgeable knife shop to determine what angle is appropriate for your knife. If they're chipped up to bad, you'll need new ones. If you have issues with your twine not being cut clean or miss a bale once in a while, it’s a good idea to service your twine knife arms. Sharpen your knife at the same angle it was previously sharpened at. This is from induction hardening. Is it OK to resharpen knotter knives? I have a 1990 John Deere small square baler that I've just got back into working order, but the cut twine ends are very ragged, which seems to indicate the knives are past their best. Oct 5, 2010 · A blue appearance on a saw tooth or knife is very hard, wont affect cutting but will be impossible to file. The knives needed sharpening which he used 4 1/2" grinder. I use an angle grinder to sharpen my sickle knife, the best way Ive found. pgx tpqa lrjkik ttk kmwpkxf ctmcdqox gez cmssxxuy agxpgug getzbyp