I bought a "user" knife and there are a few spots on the edge that appear that someone hit a metal object with it. Maybe they were cutting a cardboard box and hit a big staple. There is a 1/4" length of edge that has a severe roll, bent over maybe 90 degrees or more. How should I straighten this before I start sharpening? I was thinking about using a small diameter steel punch to somewhat iron out the edge and then get on with my sharpening. This is actually a full spyderedge knife but I don't think that will really affect the strategy for fixing the edge.
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how best to take out a bad roll?
- Thread starter bdmicarta
- Start date
I would cut into the side of my sharpening done and grind the edge down to good solid steel. This will remove any fatigued metal, stop you from over grinding in spot, causing recurves and such, and give you a clean reflection of light among the edge to help gauge progress. Then just sharpen as normal starting with a coarse stone.
Same thing applies for serrated edges. Just use a diamond rod. This will also help retain the shape of the tooth. Scrape the edge on the diamond rod then basically file the edge back on the bevel side, then only light deburring on the flat side.
Same thing applies for serrated edges. Just use a diamond rod. This will also help retain the shape of the tooth. Scrape the edge on the diamond rod then basically file the edge back on the bevel side, then only light deburring on the flat side.
Last edited:
Jason B.
Knifemaker / Craftsman / Service Provider
- Joined
- Jun 13, 2007
- Messages
- 11,179
Being serrated will effect the sharpening method.
You don't remove a roll before sharpening, you sharpen it out. A roll is damaged steel just the same as a dent of flat spot in the bevel. You have lost material in this area and it needs to be ground equal with the rest of the cutting edge.
For serrated blades use a ceramic rod or 1k waterstone and ONLY sharpen the backside of the serration until a burr is raised on the serrations. To remove the burr I use a polishing wheel, razor sharp every time.
You don't remove a roll before sharpening, you sharpen it out. A roll is damaged steel just the same as a dent of flat spot in the bevel. You have lost material in this area and it needs to be ground equal with the rest of the cutting edge.
For serrated blades use a ceramic rod or 1k waterstone and ONLY sharpen the backside of the serration until a burr is raised on the serrations. To remove the burr I use a polishing wheel, razor sharp every time.
Jason's advice on method worked for me on several serrated blades. Just make sure it sharpen the back (flat) side at a very low angle. Have the spine lifted just slightly from the stone. Then get a burr on the scalloped side. Then remove the burr and do some balancing strokes back and forth.
That being said, some of the points and curves on those blades are bad enough that they won't be reshaped by a simple sharpening. I'm sure you can get them sharp. But if you want the original shape back, they need to be reground, preferably by the original jig that made them. I think Spyderco will do it for you for a small fee.
Brian.
That being said, some of the points and curves on those blades are bad enough that they won't be reshaped by a simple sharpening. I'm sure you can get them sharp. But if you want the original shape back, they need to be reground, preferably by the original jig that made them. I think Spyderco will do it for you for a small fee.
Brian.
- Joined
- Jun 4, 2010
- Messages
- 6,642
If the serration is really creamed, I've gotten very good results clamping the knife in a vice and using a DMT tapered rod to restore the serration to something close to the original shape. It is time consuming.
This is how I sharpen the clippers for my dog's nails as well.
This is how I sharpen the clippers for my dog's nails as well.
They did at one time, but I have no idea if they still do. I sent a abused Delica I go on ebay to them 4 or 5 years ago and they had it looking (and cutting) like new when I got it back.
And then I lost it. Second one. Something about me a Delicas...
Just for the record http://www.spyderco.com/edge-u-cation/index.php?item=10. About half way down they say sharpening of plain, spyderedge, and combo are free with return shipping. Major fixes are $20 *if* they can regrind it.
Brian.
Brian.