Flat grind has 2 high spots need some help

J

JParisi48

Joined
May 14, 2012
Messages
198
Here is a pic, I draw filed a flat grind onto this chefs knife. The only problem I have is that I am taking off more metal in one spot than the others, but when I color the blade with sharpie which I have done religously the entire time, it seems I am taking it off evenly. Here you can see where I circled in red, I need to get those spots down to the thickness of the spot in the very middle of the blade, but dont want to screw it up. If I draw file it will take the thinner part down more too.. Pic isn't the greatest but I think you can see what I mean.

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Hard to say without a picture of the the knife profile. Are you using a grinder or a file? If you're using a grinder, you can try rotating the blade 30-45º so it's not perpendicular to the direction of the belt.

- Chris
 
Here is another pic from the side, I am only using hand tools, I draw filed the blade. Thanks for you help. PS the spots on the blade aren't pits,low spots, divets. My hands were dirty and my fingerprints are all over it :p

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Looks like maybe you're putting more pressure on the file at the middle of
the stroke and less at the ends. You might try putting some silicon
carbide sandpaper on a steel sanding bar and sand parallel to the edge at the edge.
This will show you where and how to straighten the edge.

Bill
 
You say if you draw file it will take4 down the thin spot too. The secret is to just go over the high spots until you have them down to the lower ones. No, it's not easy to do at first but after a bit it will go well. Frank
 
Chuck Gedraitis Knives said:
Are you clamping the blade to a board? Maybe your getting more flex in the center as you file?
Click to expand...

I think that is what happened. I had it clamped to a board, but there was a little bit of flex in it. I fixed the high spots, I tried to file them as evenly as possible without file away more of the low spot. It should be fine now thanks guys.
 
I use a marker to mark where the edge is thicker and where i don't want to take steel off.
Few strokes, check, remark and repeat
 
It was a good move to stop and ask for help. We get so tied up in the "doing" sometimes we just don't see even what might be a simple answer. Frank
 
I think you have figured it out.
Touch up those spots carefully with the file, and then switch to sanding with 100/120 grit paper. The sandpaper needs a solid backing. A 2X6" block of hardwood works well. If the blade is flexing, place some shims of wood or cardboard under it.....you want it flat if you want it sanded flat.

I also commend you for asking for help when something isn't going right. A days wait for advice can save a insurmountable error in many cases.
 
Thanks guys, I was using a file wrapped in sandpaper, maybe not the best choice. I will switch to a 2x6 block of hardwoord for the rest. I fixed it up and am going to do a test run for the handle after a final sanding before HT.
 
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