Can I use a hand-held knife sharpener to sharpen the mower blade?

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  • Updated 2 years ago
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Can I use a hand-held knife sharpener such as the Wusthof to sharpen mower blades?   https://www.amazon.com/Wüsthof-2904-7-W%25fcsthof-2-Stage-Sharpener/dp/B0009NMVRI 
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Sibyl Smith

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Posted 2 years ago

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TK

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Knife sharpeners are for thin blades. A small power tool like a Dremel works fine..


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Roger

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I would say no get a blade sharpener file
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Sibyl Smith

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Thanks for the replies - I found some tools on Amazon especially for sharpening mower blades that look like they would do a good job.
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Jacob

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Use this

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Jacob

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Actually I use these on my angle grinder. 220 grit or higher. Very light passes. VERY VERY.

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David HD, Champion

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Sibyl, you don't need to have "heavy duty" equipment to sharpen your mower blade.  The mower blade on EGO mowers are of a "softer" metal blade, so using any of the tools (you indicated above) will work just fine.

The first tool I used on my 21" SP mower was a "simple" filer I bought from Home Depot.  This tool worked just fine on my mower blade, until I decided to "upgrade" to a new set of tools.  Since I have a battery operated drill from Sears Craftsman, I decided to buy the Arnold-Blade-Balance-Sharpener.  This tool worked very well to this day and so I would recommend it.  Good luck with your final decision and keep us posted on which tool you decide to move forward with ... :-)




(Edited)
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Jacob

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BORING
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David HD, Champion

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Ha ha ....
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Blue Angel, Champion

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Jacob, not everyone has a spandex superhero costume in their closet like you and I do.
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Sid Parish

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You can use whatever you want as long as the angle of the sharpened blade is not compromised
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Sibyl Smith

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I'm definitely going with the whole Captain AGM outfit whenever I sharpen blades and even mow the grass!   However, I will change it to green and black with EGO in glitter gold.

The cape will make me look formidable and give me courage to open the box and actually use this new mower I bought.

My neighbors will marvel that a super heroine lives on their street!
(Edited)
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Sibyl Smith

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Blue Angel - I'm having trouble getting the blade off to sharpen it.

Does the bolt unscrew clock-wise or counter-clockwise?

Thanks!  :-)
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Blue Angel, Champion

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It's a normal bolt, counter clockwise to loosen. Here's the Ego video:

https://youtu.be/WsZ272F001M
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Sibyl Smith

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Thanks - you're an angel!   :-)
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Blue Angel, Champion

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Self-proclaimed, no less! :-)
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Jacob

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Perhaps if you had the suit, and were more formidable, you could have gotten it off.
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David HD, Champion

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I like it, please post a picture of you in the EGO Power Suit while sharpening your blade - I am sure the EGO Forum would be jealous of your outfit .... :-)
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Sibyl Smith

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Nothing looks used.  Everything was in its place in wrap.   The box was sealed and did not look like it had ever been opened.

It's just that I didn't expect the battery to be fully charged.

Or there to be a few broken and a couple of small whole leaves in the box.

I have everything ready to go.... blade sharpened, silicone waterproof spray applied to blade and undercarriage.   Having a cup of coffee.   Getting psyched up....

Grass is dry - temperature is mild.  Spring is in the air!

Pollen has been washed away by a few waves of thunderstorms, including a bit of hail.

All systems are go.

Almost time for lift off of my brand new EGO LM2101 - 56Volt 21" push mower
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Sibyl Smith

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UPDATE - REPORT 1st Ever Run of EGO LM2101 56V Mower all done - had 25%+ left on the battery.   I skipped a patch where some bad weeds were going to seed and will go back there to pull and bag those.   A little edging and blowing and I'm done!   

I set the cutting level at 3 for my centipede grass and it came out perfect!

After finishing the deck and blades were clean as a whistle thanks to dry grass and pre-treatment with water resistant silicone spray.   I brushed off the top of the mower with a soft broom and it's ready to roll next week...(if I can stand to wait that long!)

Not bad for a 70+ year old female!

I'll go to HD soon and give this great mower a good review.   

I LOVE no cord, no gas, no oil, no spark plugs...

Thanks great EGO community for all your coaching and advice!

A+++ on this mower!
(Edited)
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Blue Angel, Champion

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AWESOME! Thanks for the update!
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Sibyl Smith

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Just want to add to my report on the LM2101 - I used it in mulching mode and the grass was only moderately high.   There were NO clippings visible on the surface of the finished cuts - the lawn looks like it was mowed with a catcher.

I was worried because of some reports of the mulching blade not cutting up the grass well enough, but it's great.   Yay!
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Jacob

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Sibyl. You must be a writer. I love reading your posts. I'm excited to read the next one.
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Sibyl Smith

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Another thing I like about the LM2101 Mower is the rubber back flap that hangs down when you are mowing in mulching mode - that keeps dust and objects from being thrown out the back toward the operator.

That was a stroke of genius.
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(a)Typical Engineer

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I just used a Milwaukee M18 Fuel 5" grinder with 120 grit flap disks to sharpen my 20" blade, which took about 1-2 minutes per side.  Doing that with a Dremel or the specialized grinding stones on a drill would likely take 5-10 minutes per side. And I definitely cannot imagine having to do that with hand tools, either files or hand sharpeners.  I'm sure it can be done, I just think it would take a while.
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Sibyl Smith

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(a)Typical Engineer - I'm not sure I got the blades sharp enough.   I was afraid of unbalancing the blade, so I hit it fairly lightly with the angled Arnold grinder wheel that fits on my drill.    It was sharp when I finished, but not razor straight edge sharp.

The grass did not have a straight through cut - some blades looked a bit chewed on the end.

How much more should I grind the blade?

Thanks!
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szwoopp, Champion

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Sibyl - isn't this a brand new mower (or have I misread your earlier posts)  Why so much blade sharpening ?
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Blue Angel, Champion

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Even when new the blades can use a good sharpening.

Sibyl, generally speaking, the sharper the blade the better the cut the more often you need to sharpen.  I've read that lawn care companies tend to purposely dull the blade ever so slightly after sharpening, which gives up a small amount of cutting performance for a blade that keeps its given edge much longer.

For most people who don't have huge yards, I tend to think sharper is better.

Some lawns will dull blades faster than others, like those with sandy soils and/or lots of tree debris.  You'll get a feel for it after maintaining your blade for a while.
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(a)Typical Engineer

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To add to the above, keep in mind that your are trading off sharpness for durability; a razor blade or scalpel will cut very clean, but has zero durability.  I try to keep my mower blade fairly sharp, but not sharp to the point of cutting paper per say.  Agree that factory sharpened blades tend to be on the duller side of the spectrum, and I did sharpen my brand new blade out of the box, and performance improved a lot.

One thing you can do to protect your sharp blade is to walk your yard and remove rocks/stones and larger branches.

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Jacob

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So true so true. This is why I Sharpen so often. Cuz it's so sharp
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TK

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I agree, enough on the subject...


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Amber F., Official EGO Rep

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Just for community reference: we do have detailed instructions for blade removal and sharpening in the mower manual and in our video gallery- https://www.youtube.com/watch?v=WsZ272F001M
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SCDC, Champion

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This reply was created from a merged topic originally titled Forging a new blade.

Tired of the weak and thin blade that needs constant sharpening.  Forged a new blade from a Honda mulching blade set.  Took quite a bit of work, but I now have a twin blade that fits perfectly without risk of damaging the mower.  The performing heights are identical to the OEM blade, and the weight is not much more than the factory blade. 

The performance is fantastic.  A bit of physics here.  1. The blade is a "tad" heavier, so the spin up time is a bit more of a strain on the battery, but the heavier an object in motion, the harder it is to stop.  So once it is up to speed, usually within 1 second of the factory blade, it stays up to speed and has a much better cut.  The mower doesn't bog down due to the centrifical force. It also doesn't affect the auto brake.

This wasn't a project for most DIY, I did it at a machine shop with help from a pro.  I'll post pictures later.  This mower is fantastic, but the weak spot is the weak blade.  Note that the reason for the small metal OEM blade is for weight, battery life and load on the battery and motor.  DO NOT deviate much from the OEM blade weight.

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