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Mower Blade Sharpening Question
#1
I know what the sharpened angle should be but I have a hi-lift blade that is canted about 10 degrees positive from the plane for lift. My question is, Is the sharpened angle determined from the cutting plane of the blade or is it referenced to the back of the blade that is opposite the angle?

I have Googled this and only found a bunch of maybe's and could if's.

I'm sure by now that the word "anal" has come to mind. . .but if I'm going to do it, do it correctly.

-Red
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#2
The sharpened angle should be between the angled face of the blade and the back side of the blade right beneath the angle. That is unless you want to totally reshape the blade.

I used to get really PO'd when my mower blade would get dull after a very short time with me being very careful not to hit anything hard or even sticks. Most mower blades are made of low carbon steel for safety sake. You can even run into big rocks (not advised) and bend the heck out of the blade without breaking it and causing high speed shrapnel.

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#3
The edge angle is the angle between the two surfaces that meet to form the edge. I experiment with different edge angles because it's a trade-off between durability and sharpness. The smaller the edge angle the sharper the edge, but the larger the edge angle the longer the edge will last. It's possible to make the edge angle so small that the edge actually folds over very quickly and then you have a very dull blade.

Some people prescribe to the notion that the blade's edge should be filed flat to make it last longer, but that results in a blade that tears rather than cuts the blades of grass. A sharp blade makes the lawn greener so it needs less water and fertilizer. Most people cut with dull blades, especially the pros, and it leaves the lawn with a brown "frosting".
Sleepster
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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#4
For maximum durability you sharpen at a 45 degree angle relative to the edge of the blade; irrespective of what angle that creates in the plane of rotation.
This may create an angle of attack at 35 degrees due to the 10 degree lift of the blade.
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"Since this country was founded, each generation of Americans has been summoned to give testimony to its national loyalty. The graves of young Americans who answered the call to service surround the globe." JFK Jan 20, 1961
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#5
Thanks for the insight everyone.
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#6
I just run a file over it. I have a Ninja mulching blade for my snapper. They are a pain but work well.

[Image: ninjamulch.png]


Using FlashAir W-03 SD card in machine. Access through wifi with FlashPAP or Sleep Master utilities.

I wanted to learn Binary so I enrolled in Binary 101. I seemed to have missed the first four courses. Big Grinnie

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#7
....I use mine until they are ripping the grass out of the ground instead of cutting it. I can hear the grass screaming in pain from the slow death vs the nice shave. Mwahahahaha

Where was I? Oh, right, then I replace the blades. I use to do the sharpening and the leveling and all that stuff but decided since I was basically mowing a field instead of a "lawn", who cares?

PaulaO2
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Breathe deeply and count to zen.

INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.




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#8
if you have to take a blade to get sharpened instead of DIY, it is cheaper to just buy a new one. For most blades; Ninja for example. Assuming you can even find anyone willing to sharpen it.


Using FlashAir W-03 SD card in machine. Access through wifi with FlashPAP or Sleep Master utilities.

I wanted to learn Binary so I enrolled in Binary 101. I seemed to have missed the first four courses. Big Grinnie

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#9
I have to sharpen my own blades. My main mower uses 3 and it gets expensive to buy new ones or to have somebody do it. Anyway as I get older I find that I have a lot more time than I do money.
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#10
Mower blades are not so fussy IMO. I use an angle grinder with grinding disc not cutting disc, to put the edge back in, maintaining the original angles as best I can. It's fast, sharp and gets me out of a long job with a bench grinder or worse, a file.
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