(11-10-2018, 05:27 PM)Tman Wrote: We're finding about the same thing here at our facilities. We turned off the water on the belt grinders and smeared 275 degree and 375 degree (Fahrenheit) temp sensor fluid on the flat side of some skive blades. These blades were ones we use in-house and were in need of sharpening. Skive blades have a lot of bevel surface area so I felt it would be a good test. Most of ours are a 1/16th inch thick tool steel and single bevel ground at 30 degrees. Hardened to around 58. Maintaining the same feed velocity and belt pressure through a typical operation we couldn't melt either sensing fluid. We kicked up the belt speed (x2) and that melted the 275 degree but not completely along the edge so I think we must have just about hit it on the nose for the test parameters. Speed kills. With the belt speed increased 2X and the feed rate cut by a third the 375 still didn't melt. Cut the feed rate by 2/3 and the 375 turned transparent completely down the edge. Lack of speed kills too. All the skive blades (melted fluid or not) tested when finished to our typical 190 BESS +/- 20. I guess we'll put them back on the press trimmers and see what we see service/performance wise and then I'll have to think about all this.
Cool post Mr. Tman. I like it because it shows how the machine is used changes the results. Belt speed, pressure and feed rate. Obviously a belt grinder can fry an edge, but when used properly generates very little heat. Thanks for sharing.
Sounds like you do all sharpening for presses in-house and have variable speed belt grinders. I'm curious to know about the sharpening equipment you use.