Grinding the cylinder of the lawn mower is very important to get the\nbest outcome to every lawn mowing job so well show you how to sharpen reel\nmower blade or cylinder mower blades.\n\n\n\nUsually, when you grind the cylinder it is a must to grind the knife blade as well. \n\n\n\nThe most common way to sharpen the cylinder is by using a grinding compound and spin the cylinder either by hand or motor, but this can only be applicable to small and thin cylinders like the push behind lawn mower that we use in the old days, the one that uses the wheels to drive the cylinder, but it is still available in the market today. \n\n\n\n\n\n\n\nA course grade of grinding compound is used for starting, you apply this compound to the blades of the cylinder, then you adjust the knife blade so it touches more and start spinning the cylinder in this way the cylinder is being sharpened, and if you want to get a smoother finish you can apply a fine grade compound for the final pass. \n\n\n\nReversing the Reel or Cylinder \n\n\n\nA Reel or Cylinder can be reverse depending on how bad bad the blade is\n, if the reverse side of the blade is still sharp then its find to reverse the\ncylinder.\n\n\n\nBut keep in mind that not all cylinder type lawn mowers can be reverse it depends on the brand or the construction of the cylinder, if both ends of the cylinder is the same then it can be reversed for example if the drive side is female and the opposite is also female then its fine to reverse the blade,\n\n\n\nCylinder Grinding Method the Professional way \n\n\n\nA much better and more professional way of grinding a cylinder is being done using a grinding machine so most of the time this job can only be done on a shop which will require you to spend some extra bucks but I can assure you that you'll be 100 percent satisfied on the outcome on this grinding process. \n\n\n\nThis grinding method is essential for thick and long blades which is mostly use by contractors so spending a few bucks for professional sharpening is not an issue for them.\n\n\n\nIf your skilled enough to build your own grinding machine well that's\nawesome you can grind your own blade or you can make money by accepting\ngrinding jobs.\n\n\n\nJust a few tips before attempting to grind a cylinder, First make sure you check the bearings of the cylinder if you notice that its running dry then you must replace the bearings or if its physical damage and had a huge side play.\n\n\n\nAlso, a Reel or Cylinder must always be ground at the bearing surface which means a bearing must be inserted into the journal and must be held by housing that's being bolted on the grinding bed.\n\n\n\nGrinding speed is also a factor in getting a smooth and shiny finish on the blade, the faster you making a pass on the blades the rough the finish is, so just grind slowly in this way you the grinding stone can last long.\n\n\n\nAs you can see on the picture it's a 28" cylinder being a grind, you'll notice the shiny appearance of the blade when your grinding at slow speed, especially on the last pass.\n\n\n\nEvery time you finish a complete pass you can physically check the blade if it's totally sharp or it needs more.\n\n\n\nHow to Replace a Bottom Blade of a Cylinder Mower\n\n\n\nA reel or cylinder lawnmower is always composed of the blades the reel or cylinder and the bottom blade or the knife blade.\n\n\n\nThe length of the knife blade is always equal to the length of the\ncylinder which ranges from 17" to 36" depending on what brand.\n\n\n\nFrom the most common mechanical push behind lawn mower that's been\ndriven by the wheel motion to the big ride on one's they all have these pair of\nblades.\n\n\n\nSharpen or Replace Blade \n\n\n\nThe truth is you don't need to replace the knife blade frequently, If\nthe lip of the blade is not badly or completely worn out it can still be grind.\n\n\n\n\nA blade is still good to be grind if it still have a thick edges at the front\nwhere the cylinder touches,\n\n\n\nIf the front edge is already pointed there is no other option but to\nreplace the blade\n\n\n\nProcedures in Replacing the Bottom Blade\n\n\n\nReplacing the blade starts by removing the blade from the sole plate by removing the screws that hold the blade to the sole plate.\n\n\n\nMostly the head of these screws are tapered and can only be driving in and out using a rattle gun with a flat or plus screw bit. \n\n\n\nDuring the screw removing process, some of the screws might become too hard to remove especially when the blade is never been served for a long time. so you will need a pin punch or punchers to drive the screws out.\n\n\n\nOnce the old blade is removed don't forget to clean the soleplate, it's the flat area where the new blade will seat.\n\n\n\n Use sandpaper and CRC or rust remover to clean these part, If the thread for the screws has been unintentionally stripped you just need to run a tap on that thread so that it will easy to put the new screws. \n\n\n\nWhen the soleplate is ready you can now put the blade in place but before putting the blade, coat with grease that flat surface where the blade will seat.\n\n\n\nNext, one by one you can start to put the new screws on top of the blade\nand tighten them with the rattle gun.\n\n\n\nCylinder Mower Bottom Blade\/Knife Blade\n\n\n\nIt doesn't mean you don't grind the blade if its new, The blade needs to\nbe perfectly flat and square so you need to give a run on the grinder to make\nsure that it will cut equally and uniform otherwise you will leave a line in\nyour lawn.\n\n\n\nThe knife blade needs to be grind on two sides the top part and the\nfront part, When grinding the top part you need to grind on an angle touching\nthe rear of the blade to the stone first so that when the reel or cylinder\nblade spins it will only strike on the knife blade edge creating a scissor like\naction that cuts everything in its way.\n\n\n\nAlso take care not to get the knife blade hot while grinding, when it\ngets hot it will hot get you a good finish, when the blade metal gets hot it\nwill bend on the hot portion and will give you a sharp but a not cutting spot.\n\n\n\nIt\u2019s recommended to have a running water or coolant that cools the blade\nwhile grinding to avoid the blade from getting hot.\n\n\n\nThe procedures of grinding the new blade also applies to a blade that is\nstill good and can be sharpen.