Do meat grinders need to have cutting blade
Here is the relevent description on a site selling that particular meat grinder:


  The Game Winner™ Hunting Gear #8 Grinder grinds up to 4 lb. of meat per minute and features a powder-coated cast aluminum body, 3, 4.5, and 7 mm stainless-steel cutting plates and a stainless-steel cutting blade* for durability. The Cam-Lock locking mechanism and thermal reset button offer safe operation, while the feet-forward design helps prevent tipping. Full-power grind, reverse and off modes. 400-watt motor. 
  
  Features and Benefits •stainless-steel cutting plates and cutting blade for durability


It definitely looks like you'll need the cutting blade and cutting plates.