Gauteng Smallholder October 2015 - Page 36

IN THE WORKSHOP From page 32 the lightest. For slasher blades and heavier mower blades a small, accurate kitchen scale will be inadequate, while a bathroom scale will be too inaccurate to achieve the desired result. In such a case one must make an old-fashioned balancing scale. Place a length of threaded rod or steel fence dropper, or very sturdy straight wire on a blade held firm in a vertical position, For heavier blades, such as those from a slasher, you will need to fashion a balancing scale single unit you can ensure both sides are in balance by suspending it through its centre hole off a nail or length of sturdy wire held horizonfor example in a vice, so that and the lighter blade. tally in a vice. approximately half of the rod Remove the blades and the is on either side of the blade. rod and mark off this distance The side that dips downward is the heavier. If there is a small nick in the on the side of the heavier Because of the large diameter blade it will prevent the rod blade. of the centre hole and the from rolling up and down the Dress the heavier blade and blade. Move the rod to the repeat the hanging process. As fact that a blade may hang a left or right till it balances the heavier blade loses weight bit off-centre, and thus give absolutely horizontally, and through the dressing process, you an inaccurate indication of weight, it is advisable to using a pencil or a koki pen its position on the balancing repeat the exercise a couple mark the exact spot on the rod will gradually move of times, turning the blade rod where it lies on the blade. outwards until it finally over each time, to gain an Hang two of the sharpened reaches the exact same “average” idea of the amount blades off the each end of the distance from centre point of dressing needed. rod approximately equidistant that the lighter blade has at from the centre. One side the other end, while the rod is will likely dip downward. perfectly horizontal. At that Move the blade on the stage you are assured that the downward side a little two blades weigh the same. towards the centre and check If your mower has four such again. Continue until the rod blades you will need to hangs horizontally. establish the weight of the Now mark where the lighter lightest one first and dress the blade is hanging on the rod other three in turn till they and carefully measure the match it. distance between the centre If your mower blade is a 34