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Sharpening blades


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#1 crittersf1 OFFLINE  

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Posted July 02, 2015 - 01:05 PM

What is the "best" cutting angle when sharpening mower blades?

 



#2 tater195 OFFLINE  

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Posted July 02, 2015 - 01:14 PM

I like 45+/-  they dull a little quicker but dont chip out when you hit rocks

 

I also use a RAG instead of a bench grinder. I dont like to hollow grind the edge


Edited by tater195, July 02, 2015 - 01:17 PM.

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#3 framesteer OFFLINE  

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Posted July 02, 2015 - 04:28 PM

I agree with Tater.  Most new blades have a very shallow angle, that is damaged easily when you hit rocks and other hard material,  I usually go flatter tha his 45 degrees, maybe down to 30-35.  I was taught to grind them on a bench grinder and that's what I use.  I have tried the RAG, but I'm not satisfied with the "look" of the finished edge.  One helpful hint on the bench grinder, when your getting close to a sharp edge, the sparks will start coming "over the top" of the blade.  When that happens, you're likely to burn the edge if you put too much pressure on the blade.


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#4 DennyIN OFFLINE  

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Posted July 02, 2015 - 08:17 PM

I try to follow the original angle of the blade. If it is in bad shape I use a grinder first and follow up with a belt sander to make the angle flat. Most of mine are like framesteer, in the 30-35 angle. If possible I clean the underside of the deck, try to keep a sharp blade, and spray it with wd-40, it eventually wears off but helps for a while.
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#5 DennyIN OFFLINE  

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Posted July 02, 2015 - 08:20 PM

I forgot to mention, I don't go for a sharp edge, I break the sharp edge by drawing a file across it to make about a 1/64 flat.

#6 chieffan OFFLINE  

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Posted July 03, 2015 - 07:46 AM

When you sharpen any blade angle on a bench grinder you don't go across the grinding wheel.  Go parallel with the wheel.  Keeps the ground edge flat and a lot truer.  With a little practice you can feel when you have the blade at the right angle for regrinding.  One pass on one end, then switch to the other end of the blade.  Keeps the blade balanced that way.






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