SporGain [Updated] Lawn Mower Blade Sharpener 15°-45° Adjustable Frame with Ball Bearing Manufacture Handle for Right & Left Hand Blades, Use with Angle Grinder, Black

Came fully assembled (who even does that anymore?) 4 different stems included to fit the Handle threads of most any 4-4.5" angle grinder. I mounted mine on a couple pcs of scrap wood, so I can use this while temporarily attached in a vise. Who wants to tie up bench real estate for a sharpening jig, that only gets used once every 2 or 3 months. Works fine, to keep a consistent angle grind, a little sloppy in the articulated joints, but acceptable. Works freely without any resistance... You can tighten the joint bolts, and lessen the (minor) side to side slop, but then it fights you with a little with resistance during use. I assumed 30 degrees would be the normal angle to set. but my blades were closer to 35. You can't really set it to "just any" degree angle. There are notches within the adjustments. Meaning you can't set it to 32 or 37 degrees (easily). Only just the notched 5 degree increments. just match what you already have on your blades, and keep a wet sponge nearby, to you can keep the blade from getting too HOT. Warm is ok, but getting the blade really hot will take the temper out of the metal, and then the blades wouldn't be as hardened, and lose their edge PDQ. Minimal (less) grinding is way better for you, the blades & your Flap disc too. (I use a 40 Grit) This thing is kind of pricey for what it is, and I wouldn't have bought it if I only had ONE mower, but I have many mowers, and most of them have many blades. A nice jig unit, and I won't miss the dropping off, and remembering to go pay & pick up the blades anymore. I keep my blades sharp, so I can mow faster, with out the re-runs for missed patches, and try not to intentionally run over too many blade edge wrecking objects. Pick up the rocks and sticks, or you will be running the same ones over again next week.

Not the easiest thing to use but reasonable install and setup. One caution: REALLY tighten the grinder angle set screw, hand tight won't do it. Had to use pliers on thumbscrew to keep it from lossening up and changing angle. Otherwise, works pretty good and should work with a variety of 4-1/2" and 7" grinders. Also recommended, check your grinding angle against a new blade. I thought my blades were 35° and I was having to grind ALOT to get them sharp. Turns out they we ground to 40°. Went much faster after that change. Always check blade balance after sharpening (wall mounted balancer recommended due to increased accuracy and sensitivity). Recommended.

So I've been sharpening my mower blades for years using bench grinders and a nail for balance. I recently heard about these new flapper wheel grinding disc style sharpeners, so I thought maybe I should move into this century, with technology. First I will say it's easy to assembly, functions as it's intended to and with its different anchor shafts, should fit most grinders on the market. I know it fit my new Metabo, that I bought for this task. You don't need a special grinder, just one that hold the flapper / sandpaper grinding discs. I wouldn't use standard grinding discs, as they might shatter and/ or cut too fast. This is about making multiple passes and losing as little metal as possible. In fact it's a lot easier to balance afterwards, versus with the grinder. So why 4 stars? The angle indentation markers it comes with don't seem to make sense. I set them for what the manufacturer of my blades tells me they are and this things angle adjustment seems to be nearly suggestions. I end up setting it and then making a fast pass, to see if it needs to be adjusted. Once set, it fairly straight forward. The arm holds the grinder at that angle and all you do is lift and glide it onto the blade and push straight through and lift at the end- repeat. Like I said, super easy to get balanced. Id say it cut down my sharpening times by half, from using a bench grinder. But here is the second caveat, it doesn't seem to be sharp enough. I recently cut my grass with these newly sharpened high-lift blades and found too many single strands for my liking. Even with my blades nearing the end of last season, previously being sharpened by a bench grinder, they still left my grass flush with maybe one or two stragglers. This years first cut wasn't as good. Maybe I need to practice more and see if it's me, but you can only make so many passes and fear heating the blade and making it brittle. Not good for a yard with a lot of hidden rocks. I'd say if you catch this on sale, already have a grinder and sandpaper flapper disc, then give it a shot. It's a 100% better than those things you attach to your drill and hope it doesn't blow apart with you sitting under a close deck.

All I can say is wow. Wish I had purchased this sooner. Very well made and functions as shown. It illustrated how bad my free hand sharpening was. My lawn is beautiful

I have a few old school ways to sharpen blades (fine stone blade sharpener, electric grinder), but nothing is as easy to use as this. I used a hand grinder with a flapper disk for the main part of this setup. Once I have setup all the angles and mounted my blade, the magic begins. Put on your safety glasses and watch how easy it is to get those grind angles perfectly on the mower blades. I am amazed how fast you can sharpen and how easily. You get the accurate angle every time. The best part of it is it does not take up much room when storing. I is durable and will last you a long time.

SporGain Lawn Mower Blade Sharpener The SporGain Lawn Mower Blade Sharpener is a highly effective and versatile tool for maintaining sharp, precise blades on your lawn mower. Constructed from high-quality materials, this sharpener offers exceptional durability and performance. Its adjustable design allows for sharpening angles between 15° and 45°, ensuring compatibility with nearly any lawn mower blade. One of its standout features is the secure, firm grip it provides, holding blades in place for safe and accurate sharpening. Installation is straightforward—simply attach the sharpener to a table, workbench, or a sturdy block of wood, and you're ready to work. It is also compatible with most angle grinders, provided they include a right-hand handle option. In addition to its primary purpose, I’ve found it useful for sharpening machete blades (though this is an off-label use). The precision and efficiency of this tool make it a great investment for anyone who values well-maintained tools and equipment. Whether you're a professional landscaper or a homeowner looking to extend the life and performance of your lawn mower blades, this sharpener is a reliable and easy-to-use solution. Highly recommended!

I have been sharpening my blades with a bench top grinder for years. Then I switched to my handheld grinder with a sanding paddle. This has now upped my lawn care game. Being able to sharpen the blades at a consistent angle is extremely helpful. The tool arrived and there was minimal assembly. As you can see in the video and pics, I mounted mine to a scrap piece of lumber and then placed that in a vice so I could do this outside. I just don’t have a good space or a workbench indoors to mount this (yet). I purchased the brass fittings at the same time in case there was unnecessary wobbling, but I must be lucky because I didn’t experience any play. The mounting bolt fit my Dewalt grinder fine and it slid into the sleeve on the tool with no play. There are pictured instructions included, but if you’re reading this and have any skills it all, you won’t have any problems. My blades fit snug and I attached the grinder. The blades I sharpened were in real rough shape. I’ve hit tree roots and there were chips in the blade. I set the tool at 30 degrees and began sharpening. I had to spend a couple minutes on each side of each blade…but I got them all nice and sharp, ready to shear some turf. If you’re considering this tool you already know how important sharp blades are. Because this keeps the grinder at a consistent angle it’s a no brainer. There are tools that are several hundred dollars you could purchase that sharpen blades but I feel you save money with this and likely do just as good. If you do get a model that has that wobbly play others mention, just spend the extra money to get the fittings and Loctite. You’ll still be way ahead on savings. Additionally I like how this tool doesn’t take up a lot of space with its small footprint. Because mine is on scrap lumber I can store it away and then get it out when needed.

I purchased this to sharpen the blades on my Honda HRX217HYA lawn mower with the twin blade mulching system. I had always just used a file to sharpen the blades and I am sure that it was not very preceise at all. I have two sets of blades that I alternate. I saw this system and after watching some YouTube videos, I decided to give it a try. I mounted the lower angle piece to a 2x4 and clamped the 2x 4 into my Workmate bench and set the first blade into the unit. I did need to adjust the 4 bolts that clamp the blade onto the sharpener since they were too low for the bigger blade to fit in. After adjusting the 4 bolts so the blade was secure I clamped it in and set the angle adjustment to 35 degrees. I only had to do about 5 passes with my angle grinder and a 60 grit flapper disc before the blade had a nice sharp edge. I put the blade on my balancer and just needed to make one more pass on the heavy side to get it in balance. After I finished the first blade I readjusted the 4 holding bolts for the smaller blade and sharpened it. Like the bigger blade, I needed to adjust the balance. The blades had kind of a slight ragged edge so I just ran a file once over the edge to remove the burrs. Like others have stated, this "Updated" model does not seem to have a ball bearing in the pivoting section where the two beams connect, even though the picture and description shows it has one. This is a disappointment, but I guess "Upated" does not always mean better, just different. This erroneous description is the reason I took off a star. I liked that it came with the 4 lag bolts to secure it to the 2x4. I have a Hercules 4 1/2" angle grinder and one of the provided adapter screws fit the grinder perfectly. For the money it works good, and since I only have one mower and two sets of blades it fills my needs.