I dulled my knife with 2000 gr. paper...why ?

C

CBurgerjr

BANNED
Joined
Feb 4, 2010
Messages
508
I just picked up some 2000 grit sand paper, hoping to give my knives a polished razor sharp edge....but after I did on , it had dulled it bad..What happed ? I'm a great freehand sharpener with stones...I can get hair poppong sharpness with them...I tried that, but had no luck...Any body can help ?


J.J.
 
What was the condition of the edge before you used the 2K? ie. freshly sharpened and if so what was your final grit, been sitting around, or lightly used?
 
What was the sandpaper on? Was it a soft substrate? Did you press hard?

If so, you may have rounded your edge.
 
I may have pushed too hard...Give me some pointers on this.. I've never have gone any further than ust using my fine side, and it usually is smooth looking blade and sharp...hair popping, that's really as sharp as i need, i guess.
 
the weight of the blade at most, no pressure would be my suggestion. Maybe a harder backing depending on what you used.
 
CBurgerjr said:
I just picked up some 2000 grit sand paper, hoping to give my knives a polished razor sharp edge....but after I did on , it had dulled it bad..What happed ? I'm a great freehand sharpener with stones...I can get hair poppong sharpness with them...I tried that, but had no luck...Any body can help ?


J.J.
Click to expand...
Hmm it sounds like you are doing a V edge not a convex. What is the materail you are using to back the sandpaper. If it's soft, and you sharpen at any angle your just dulling your edge, and giving it a very weird convex profile.

If you are going to do a V edge get a piece of glass and spray adhesive spray some onto the sandpaper back and stick it to the glass then sharpen spine leading (stropping motion)
 
Be careful about adherence of sandpaper to the backing material: if it's less then perfect, pressure will actually cause the sandpaper sheet to "wave" thus rounding your edge. Do as Chococrazy said, it might be easier, especially if you're unsure on the adherence thing. Gotta glue that damn paper down :D
 
chenko said:
Be careful about adherence of sandpaper to the backing material: if it's less then perfect, pressure will actually cause the sandpaper sheet to "wave" thus rounding your edge. Do as Chococrazy said, it might be easier, especially if you're unsure on the adherence thing. Gotta glue that damn paper down :D
Click to expand...

That's why I said glass it's pretty much perfectly flat ;)
 
chococrazy said:
Hmm it sounds like you are doing a V edge not a convex. What is the materail you are using to back the sandpaper. If it's soft, and you sharpen at any angle your just dulling your edge, and giving it a very weird convex profile.

If you are going to do a V edge get a piece of glass and spray adhesive spray some onto the sandpaper back and stick it to the glass then sharpen spine leading (stropping motion)
Click to expand...

Well,like i said, this is the first time Ihave used sandpaper to finish myblades. I'm noteven really sure what a convex edge would look like..i'm a rookie at this , but I'm happy with what I have done so far...My edges are sharp..I wouldn't say wicked sharp., but they will pop hair easily. i guess i need a little more practice. huh ?
 
CBurgerjr said:
Well,like i said, this is the first time Ihave used sandpaper to finish myblades. I'm noteven really sure what a convex edge would look like..i'm a rookie at this , but I'm happy with what I have done so far...My edges are sharp..I wouldn't say wicked sharp., but they will pop hair easily. i guess i need a little more practice. huh ?
Click to expand...

What are you using to back the sandpaper?
A convex edge is a different type of Edge Profile than a convention V edge.
A convex edge is more or less shaped like a bullet, it allows for a stronger edge, and doesn't use any angle as it's semi circular and has no shoulder.
A convention V edge is what you are used to seeing on stones an edge that looks like a V.
You can get a convex edge by sharpening on either sandpaper with a soft backing (mousepads, scour pads, leather, and synthetic weight belts). If you are trying to make a V edge sharper with sandpaper then you'd want to put the sandpaper on a hard backing that is very flat (e.g. Glass), and you want to sharpen in a stropping motion.
 
You must log in or register to reply here.
Back
Top