The wall thickness of the workpiece is too small, the dead weight is light, and the grinding allowance is large (about 0.0 1-0.05? It would be nice to straighten this workpiece. ), leading to the grinding wheel stop effect is not obvious (grinding wheel drives the workpiece to walk), and the workpiece slips and jumps on the guide wheel. Solution: increase the deflection angle of the guide wheel frame in the vertical plane, so that the contact between the workpiece and the grinding wheel becomes approximate linear contact (sparks appear in front of the grinding wheel, but there is basically no spark behind it). -Your dresser moves to the right, probably because the grinding wheel touches the workpiece behind the grinding wheel, just the opposite. If the center height is calculated again, the tangent angle between the workpiece and the two wheels should be 6-7 degrees. If you really can't, just take something and press it down (1 meter should have a feeding rack, right? )。 Your workpiece is too long and too light to make. If it's done, we'll see. thank you