... fully automatic adjustable speed knife grinder.Automatic feed grinding wheel, grinding head with paste-type cylindrical grinding wheel, grinding wheel life increased to 1 / 3, which ... greatly reduces the cost of grinding and grinding back and forth ... 1.7m, 2.2m, 2.4m, 2.6m, 2.8m, 3m, 3.2m, 3.5m, 4m, 4.5m, 5m, 5. ...