Sharpening mower sections

I think the best way would be to use a V shaped Grindstone but I just use a 4" hand held grinder and use a lite touch.
 
They made a grinder for that job with a "v" shaped wheel on it. I don't believe you could use a stone like that on a regular bench grinder. I use the serrated knives and they don't need sharpening.
 
When I was young Dad had a V shaped stone as mentioned above, and a sliding guide that you could clamp the knife bar to. The guide wasn't really long enough for six or seven foot tractor bars, he had originally gotten it for the five foot horse drawn mower. It was still easier than free handing the whole bar, especially when I was ten years old.

When I first got a seven inch angle grinder I tried that and decided it was easier, but as I got older, I finally gave up the seven inch and bought a four and a half which I use now, if I can't get my son to do it for me. A while ago he had sharpened a knife for me and it looked different. I found out that he had just grabbed the grinder from where I was using it, and didn't notice that it had a flap wheel on it instead of the hard wheel he usually uses. It did a much better looking job, with fewer burn marks, but I am not sure I want to spend the money for flap wheels, as they don't last nearly as long as the hard ones.
 
Flat side of a 4" grinder disk on a air powered die grinder. Easiest way I"ve developed. Air powered die grinder powers up the wheel strongly, and doesn"t bog down much.
 
Back in the '50's my cousins used to do them with a flat file! Took a little longer, but saved investing in any power machinery. Maybe I didn't hold the knives right, but I never had any luck with a "V" wheel on a bench grinder!
 
It's amazing what still hangs in the shed that belonged to Great Grampa.I remember dad saying he sold out in 39.We have the guide for the other side also
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Take a look below of a few photos of McCormick-Deering grinders.

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<a href="http://s200.photobucket.com/albums/aa5/jameslloydhowell/John%20Deere%20Equipment/McCormick/?action=view¤t=IMG_2811.jpg" target="_blank">
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<a href="http://s200.photobucket.com/albums/aa5/jameslloydhowell/John%20Deere%20Equipment/McCormick/?action=view¤t=IMG_2810.jpg" target="_blank">
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These grinders would probably work.

Our <a href="http://youtu.be/rnH8n4KOYoU">JD #5 sickle mower</a> knife has smooth sections that are sharpened with a flat file.

<a href="http://s200.photobucket.com/albums/aa5/jameslloydhowell/John%20Deere%20Equipment/Easy%20and%20No%205%20Mower/?action=view&current=IMG_1462.jpg" target="_blank">
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Hope this helps.
 
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