When it comes to sharpening mower blades with an angle grinder, the choice of disc is crucial. You want a disc that can effectively remove material and restore sharpness to the blades. Based on my experience as a gardening and landscaping expert, I recommend using either a 36 or 40 grit flap disc or a hard disc for this task.
Flap discs are a popular choice for sharpening mower blades because they offer a good balance between material removal and surface finish. The 36 or 40 grit flap discs have coarse abrasives that can quickly grind away the dull edges of the blades, allowing you to achieve a sharp cutting edge. The flaps on the disc also provide some flexibility, which can help contour to the shape of the blade and minimize the risk of uneven sharpening.
Another option is to use a hard disc, which is characterized by its aggressive cutting action. These discs are typically made of aluminum oxide or zirconia alumina and have a dense composition that allows for fast material removal. A hard disc can be a great choice if you have severely dull blades or need to remove nicks or deep imperfections from the cutting edge. However, it’s important to exercise caution when using a hard disc, as its aggressive nature can result in an uneven sharpening if not used carefully.
In terms of disc shape, both straight and beveled wheels can work equally well for sharpening mower blades. Straight wheels provide a flat grinding surface, which can be advantageous when working with larger blades. On the other hand, beveled wheels have a slight angle on the edge, which can help in reaching tight spots and achieving a more precise sharpening.
When it comes to flap discs, you can choose between type 29 or type 27. Type 29 flap discs have a conical shape with angled flaps, while type 27 flap discs have a flat shape with straight flaps. In my experience, both types work equally well for sharpening mower blades. The choice between them often depends on personal preference and availability in your area. Personally, I tend to use type 29 flap discs because they are easier to find locally.
To summarize, for sharpening mower blades with an angle grinder, I recommend using a 36 or 40 grit flap disc or a hard disc. Both straight and beveled wheels can work, depending on your preference and the size of the blades. Type 29 or 27 flap discs are equally effective, with type 29 being my personal choice due to availability. Remember to exercise caution and take your time when sharpening mower blades to achieve the best results.
