how to sharpen a lawnmower blade

amzn.to/2ffa34u Impact gun 1/2" makes this job go fast.
amzn.to/2dW2mOG Impact deep socket set
amzn.to/2eRg97U 1/2" torque wrench.
amzn.to/2dW2q0P Ball bearing blade balancer
amzn.to/2eFKx4M 8" bench grinder for sharpening blades
goo.gl/spnSpW Click link to get your blade sharpener.
Learn how to sharpen a mower blade using a bench grinder. Disclaimer:
Doublewide6 has a Master’s Degree in industrial technology with a specialization in Manufacturing, due to factors beyond the control of Doublewide6 and anyone featured in his videos, I cannot guarantee against improper use or unauthorized modifications of this information. Doublewide6 assumes no liability for property damage or injury incurred as a result of any of the information contained in this video or any of Doublewide6’s videos. Use this information at your own risk. Doublewide6 recommends safe practices when working on equipment, power tools, chemicals, electronics, electrical systems, vehicles, and or with tools seen or implied in this video. Due to factors beyond the control of Doublewide6, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Doublewide6. Please support Doublewide6 by donating to his Patreon Account / doublewide6

[@graysonbill]

You should do a video on balancing the grinder wheel.

[@vl.3552]

thanks for making this video. i have same bench grinder bought over 30 years ago and just unboxed it today! LOL. didn't know how to sharpen lawn mower blade and found your video! next thing to sharpen would be my shovels.

[@miraclarkeshome3040]

Great video. Love the tip on blade balancing... I had not considered that in the past. Thank you for this! :)

[@MarkBrockman]

Thanks for the vid. Validated what I thought I knew and the balance thing I didn't know. Liked.

[@bobreinhardt1888]

This is not a dig but you should balance the wheel on your grinder. Thanks for the info and Good Video

[@Nortekj]

I would say that the grinder is in bad need of having a wheel dresser used on the grinding wheels, from the sounds of it the wheels are out of balance and is causing a lot of vibration, also the grinding wheel has a warp to it that is causing it to wobble side to side, a potential safety hazard as it could cause the wheel to possibly crack and shatter and then throwing it out towards the user at enough force to cause harm.

[@sku32956]

I use a good file it takes longer so what I enjoy doing it that may sound crazy like a knife sharpen relaxing, I do have a grinder. With the file it less likely to whack it wrong real quickly .I like work gloves working with a grinder I have caught it on a grinder bloody mess.

[@user-tv5dt3nm9y]

I feel like I can competently sharpen a blade now. I liked the step by step presentation on the process. I thought the screw driver in the vise was a little bit of genius for balancing. Very practical advice at the end. The blade doesn't have to be pretty to work.

[@trumpking4874]

A grinder and a flap disc is so much easier and gets it so much sharper

[@bottleimp007]

A straightforward and uncomplicated approach to getting the job done. Very nice.

[@LeeKobe1]

Good video. I've used a mini grinder to sharpen my blades for many years. It's worked well for me because I always balance the blade using the simple cone balancer. Never any engine bearing or seal problems. Think I'll go with your system now though...more accurate, safer, and easier. Thanks.

[@theDMLair]

Great video. Thanks!

[@loannes.lindley3949]

I love the sound of the metallic grinding. Sounds like a pulse electric phaser.

[@doublewide6]

Thanks, I'm sure my viewers will appreciate your explanation.

[@barrywuthrich8530]

I think the angle grinder with a sanding disc is a good option. But, if you are using a bench grinder, they make wheels that grind cooler. They are pink and blue, I think. You are less likely to overheat and soften the metal with them. Thanks for the video.

[@gscaton1]

I have a grinder like you, do I use the smooth grinder on the coarse grinder.

[@carolbaribeau8679]

Overheating doesn't embrittle the blade - it softens it. The overheated area will not hold an edge and will dull more quickly. Discoloration of the ground area to straw or blue is an indication of the amount of "drawing" the material has undergone. If the visible surface of the blade has turned blue, the very edge has been heated to red or white hot, completely annealing that region and rendering it soft. This is why knives are sharpened under a curtain of water to keep them cool.

[@Canosa612]

Excellent video.

[@thomaslewis9526]

You saved the best advice for the end, it will cut much better even if it isn't pretty. I discovered this in hand sharpening wood saws with a file. Then, after you've done it awhile, it gets a lot prettier. One thing though, I like to make really light passes, and I try really hard to do exactly the same pass on both sides, right at the same time. Thanks for a nice video.

[@Bertthemovieguy]

would you recommend using the bench grinder on a old fashioned wooden work bench or one of thesè portable ones you can buy for like 30 dollars thaþ fold up

[@steven1110]

Thanks for the video and explaining clearly liked and subscribed.

[@MYTOYMAKERZ]

Thanks for the video and your time. Different strokes for different folks. Ever notice how long the blade that came with your new mower keeps its edge? It's because they - the blade manufacture takes the time not only to sharpen it right but in doing so there are no grinding marks in the blade. Plus grinding a blade it's important to keep a roughly 45 degree edge all a long the sharp edge not a rounded uneven 45 degree edge. A lawn mower blade should never be sharpened or end up with an edge like a knife. A lawn mower blade should only be sharpened on one side or you end up with a feathered edge like a sharpe knife also. It is not only the edge that gives a clean cut but the whole 45 degree angled edge but starting with its sharp edge first of course. I sharpen all 9 of my blades with the dullest beat up wood file I have. It only takes me roughly 45 minutes to put a nice edge on it edge of a blade. Once I am done filling I take a sanding block with 300 grit paper to finish even up the file. Than I use a Dremel tool with a 1/2" dia. disk to polish it further. Let's not forget to remove all of the old dried grass and dirt off the blade also or you will never balance it. After approximately 12 hours I have all of my blades looking like knew. Like I said different strokes for different folks and if you believe all of this crap I will bring all of my blades to your house and you can sharpen them your way LOL just some humor it's so nice to see people not arguing - what a breath of fresh air. Thank You All

[@carlosrodriguezv.7062]

Good advice ,i liked thanks,good tips ,can you make some yideo tip for maintenance for a scag liberty,thanks good day

[@QuietStorm3757]

Very helpful video & info.thank you 👍🏿!

[@TrickyTed]

Thanks for sharing - nice vid.

[@terryhites7322]

Nice job, I’ve never done this before because I typically buy new ones, not because my money grows on trees but because when you hit a stump, root, or sidewalk, they are bent beyond repair 🧑‍🔧

[@Suncast45]

10 years later, July 2022! found a like new 6" Craftsman grinder on Craigslist. Will try this method ASAP. The right side on mine is coarse 60 grit! The left is medium 36 grit. Thanks!

[@Geraldtoo]

I have to say that a bench grinder would be one of the last options I'd use to sharpen a blade. Granted it can be done if one paid a good bit of attention. The best method I've found and is widely used is a flap sander wheel on angle grinder.

[@SHADOW-games-159]

Idk. I work at a lawn care company. That's what we use to sharpen them

[@jymcotton9904]

Dude your grinder sounds like it's about to take off! That wheel needs to be balanced! Better yet, just replace it. It has been a few years since you posted this video. Are you still using the same wheel? lol.

[@sb9e]

Balanced and sharp. Nice tight fit

[@billbaber6653]

Good class going to buy bench grinder just paid 25 dollars for sharping good explaination thanks

[@vadhertutorial]

Hi.. nice video.. what the minimum power motor I would need to sharpen my mower blade?…… would a 150watt be too weak…thanks

[@stuckondrumsssss1968]

Nice video and very helpful Thank you.

[@fishtown7294]

hidubol wide 6 what lawn mower do you have

[@derperderp9036]

Great video, no bs. Thank you bro

[@Jayman001]

Good Old video, but good instructional video…i have both bench and angle grinder and i think i like my angle grinder better😂

[@RayNellum]

Very good video!!! Thank you.

[@gsp49]

Ray Nellum , bull, this is how NOT to sharpen a blade.

[@orviskid]

What grit do you use on the wheel? Bench grinder best way to go

[@raulsanchez-ortiz7099]

Best tutorial ever

[@DavidEmerling79]

Most rotor grinders have two wheels, one more abrasive than the other. Did you use the MORE or LESS abrasive wheel? Good video. Good technique.

[@knighthawk86855]

Nice job man...I see ur grinding wheel is unbalanced head to like u said harbor freight tools and pickup a honing wheel it will true up the grinding wheel and make it balanced I use it on mine every year or so as I run my own Lawnmower repair shop....keep the videos coming!!!!!

[@GrassDaddy]

I used to pay someone to do this, but it's not hard at all. Nice video

[@phhortress]

If your grinding wheel wobbles like that trash it. Craftsman makes crap(sman). It's also better to use a guide (jig) to set the angle rather than trying to freehand it. Yes - it's just a lawnmower blade but you can remove a consistent amount of metal from both sides with just a few passes using a guide.

[@Jason-zw2dg]

how much do you charge? I have a couple blades that needs sharpening

[@tonyswhirl]

Well done

[@goldenboyproductions7229]

hey, i just found your channel on KZbin and it's great! I just bought a grinder and I wanted to know what grit disc do you leave on your grinder for all around metal grinding, sharpening etc. I wanted to use one side with a wire wheel and the other side with a standard grinding disc.

[@jeffstanley4593]

Low speed grinder from Rikon, about 1750 RPM max. Less chance of over heating.

[@chilliewilly41]

"Shiny" = sharp?

[@KevAdams1989]

use a brand new file to keep the 30 degree factory edge on the blade. it doesn't need to be a razor edge, razor edge will dull down in no time and your hard work will be for not.

[@KSMike1]

Exactly. I do it only with bastard files. You can control the bevel, handle the curves which are now common on mulching blades, and put the perfect flat at the cutting edge.

[@TerryBoudreau]

Thanks

[@geojor]

very helpful video, thank you...

[@christinaedwards5617]

I would like to start by saying thank you for the video but you really need to balance and true your grinder stones and not use until you have if you just loosen the nuts and spin the flange washers it will help a lot

[@shawnhorton2000]

Nice video

[@Swampfox321]

Go out and get cha a $30 bench grinder...... (He has the $20 model) I highly recommend a JET 8 inch bench grinder. Very nice. A high end machine

[@bucketrobbert]

bench grinder out of balance

[@greenblades19]

Looks a little uneven. I like using a die grinder. Takes less material per swipe and is much easier to follow the correct angle

[@emilkadow658]

I prefer safety squints

[@scootergeorge9576]

When I reinstall the blade how tight shoud it be? How many ft lbs? I have an electric 1/2" impact wrench I've used for this before. That OK?

[@doublewide6]

A 21" push mower about 60ftlbs. Commercial mower near 100ftlbs.

[@scootergeorge9576]

Thanks. I don't want to strip the cranshaft threads or have the blade come flying off.

[@doublewide6]

Check you manual or online for exact Torque. Use a torque wrench rather than impact gun in order to get it correct.

[@cwc8979]

doublewide6 Hey, Thanks for making this video...I ned to sharpen my blade, you think I should do it myself or take it to a mower shop and get it done? I heard they charge 5 dollars....also hope your son is doing better man, you seem like a nice guy and really smart. I will say a prayer for your son.

[@jymcotton9904]

as tight as you can. Don't think too much about it. All the lawn mower shops just use air guns till the bolt bottoms out with that, "gaadiiit, gaddiiitt" sound. I did it myself for 15 years in my landscaping company and never had a problem. Sorry for the late reply....

[@Buttscum]

i am just going to use my dremel to sharpen my blade. i have an attachment for it.

[@CH-cc1tv]

Why do people think we want to hear their life story on these videos. It should take 2 minutes or less to show us the steps you use to sharpen a lawnmower blade.

[@bigjoe2458]

I agree. I was really expecting some scientific knowledge on how to. boy was I disapointed.

[@Chris-jh3tg]

I used to use a bench grinder, but it cupped the blade too much. I use a file in a vise now or angle grinder now.

[@bigalforsyth]

I notice your blade is sharp way down the length of it. Mine is only sharpened on the last few inches. Should i grind the sharpened edge further down despite it came from the factory with only a few inches sharpened at the end?

[@KevAdams1989]

don't bother, the factory length is the only affective area. that portion of the blade is the only part traveling fast enough to cut grass, as you move towards the center, the rotational velocity decreases too much.

[@jymcotton9904]

yup

[@iantaylor2849]

Thanks for the video. Oh my god you people, enough about the unbalanced grinder. Why do 50 different people feel the need to make the same comment?

[@LeeKobe1]

Agreed. Lots of insecure YT 'experts' out there. Lol

[@harpert579]

Because no one gives af what you think.

[@demisx]

That grinder doesn't sound right. Out of balance?

[@Bertthemovieguy]

why is it wheñ yoù buy a blade from store its always dull and barely sharp but claim its ready to be usèď

[@bucketrobbert]

totally agree gave bosh that make qualcast lawnmower a bollocking for selling lawn mowers with dull blades

[@KSMike1]

For one thing, mower blades are actually not supposed to be razor-sharp. This is something few seem to understand. Honda Service manuals actually say to get it sharp and then create a tiny flat (square) at the edge. Mower blades that are truly sharp will round over within a couple of mowings or less.

[@hxrxld]

Does the metal dust this create mess up your lungs? Should you wear a respirator?

[@KristianPKristianpipes]

You should be careful with that bench grinder it looks like shaft or grinding stone are of balance . I have seen those stones catch in the workpiece and snap in to and that is not a pretty sight. Take care

[@jbonesalot]

After the bench grinder use a file to clean it up. That will help the blade hold its edge longer. Not going to get in it with you about the bench grinder.

[@bobbrock4221]

I keep making my blades more dull. I am terrible at this.

[@themasterpackrat]

1. You need to replace that out of round grinding wheel. It is dangerous in the condition it is. That is why your grinder is shaking so much. It could explode at any moment! 2. You should actually invest in a pair of clear safety glasses so you can see better. 3. You should adjust the tool rest on your grinder. It is unsafe to hold the blade in the manner shown. The blade should be laying flat on the tool rest. 4. You can purchase a cheap blade balancer (about 2.00) that actually will balance your blade. The method you are using is a waste of time. I usually don't comment, however I hope I can caution anyone watching your video to NOT sharpen their blade like you are teaching. It is an accident waiting to happen.

[@MrTdw1954]

themasterpackrat Where's YOUR video?

[@themasterpackrat]

MrTdw1954 I don't have a video. I am just commenting on your unsafe actions. I believe you should remove this video and make another one that shows a safe way to use a grinder. Not just for sharpening a blade, but for any other grinding operation. The tool to dress the wheel is not expensive. Try Harbor Freight. They should have one. It is called a "Wheel Dresser". Item no. 1682. Cost - $4.49.

[@damian5209]

themasterpackrat Very professional Sr. I also agree with you on every point. The grinder is dangerous on that conditions. I just took the stones out of my grinder since they have minor defects but I'm worry that people would used like that.

[@burrmanchu687]

"it could explode at any moment".. lmfao Yeah no.

[@robertblalock5009]

Balance that wheel before you get killed or blinded..Seen enough, thank you.

[@bobd.fletcherjr4912]

👍👍👍👍👍👍👍👍👍🙋‍♂️🙋‍♂️🙋‍♂️🙋‍♂️🙋‍♂️

[@lordvoldemort2993]

Its safer for the user and the blade to put the blade in a table vice and use an angle grinder. This works, yes, but its not the easiest way. Using an angle grinder lets you see the side your grinding and make smooth even passes. This helps you know if your burning it and if you know what your doing you can keep a perfect balance every time.

[@ralphrydenii4052]

I worked for a guy for 10 years that resharpened tools and lawn mower blades the guy didn't do it right the hole cutting edge has to be shinny and sharp.

[@bigmower]

This video is so wrong on how to sharpen blades.

[@johnculpepper3748]

First, his grinder is out of balance, it needs balancing FIRST. Flattening a really 'nicked' cutting edge is correct, I would NEVER grind the flat side of the blade to remove burs, the natural wear of the blade when cutting the grass will remove them. You really have to be abusive on a grinder to burn the metal, so go slow, just remove small amounts of metal at a time, and try to maintain the factory angle. Be sure to balance the blade before reinstalling on the mower. NOTE; a mower should run at a fairly high RPM so the blade will 'lift' the grass blade so the mower blade can cut it, most people run the rpm slow to conserve gas, higher rpm is better.

[@73roadrunner1]

sloppy work

[@AltonRowell-gb1lb]

That is not a good way to check balance. Nice video.

[@jw2par]

Gloves?

[@danielscott4514]

NO!!! ... never gloves near a grinder (or any rotating tool) Gloves have a tendency to snag and pull your hands into moving machinery. The one possible exception is when you have buffing wheels on a bench grinder - then the gloves may do more good than harm.

[@lynnh7694]

That grinder is out of balance.

[@Captleemo]

Dude, that's the worst thing you can do to a mower blade. If you want much better results use an emery clothe disc on a 4 1/2 inch angle grinder and clamp the blade in a vise.

[@dennisbarton7373]

A small angle head grinder (used with care) will do an excellent job. The problem with a bench grinder is overheating the cutting edge, the blade will dull very fast because you have annealed the edge. I use a bench belt sander to sharpen my blades, they stay reasonably cool and you get a very sharp, uniform, professional looking edge.

[@kycoalminer35]

An angle grinder has much better results.

[@robertlavrakas7442]

No gloves?!?????

[@TOMVUTHEPIMP]

That edge is fucked up. Terrible job.

[@n40tom]

THAT IS ABSOLUTELY NOT THE WAY TO CHECK THE BALANCE. NOT ACCURATE AT ALL.

[@johanzh2550]

looks terrible

[@gsp49]

No dummy! You never grind on a mower blade, it weakens and takes the temper out of the steel. You have to heat the blade and use a hammer to sharpen it.

[@naimkrasniqi3036]

👎👎👎

[@Djoanng]

Thanks