Can't get a full burr for the life of me

[OilMan]

Something is going on, I'm trying to put a new edge on a Ratweiler w/my Edgepro and for the life of me I can't get a full burr on it. The front portion of the blade (a little before the belly starts, the belly and the tip) burrs up fine. No problem. The rear 4-5" won't burr for anything. I'm using the marker trick and the marker is completely gone but still no burr. I grind for another 10 minutes after the marker is gone, no burr. I don't have a magnifying glass to look at the edge but from what I can see holding it up to sunlight the front is smooth and the rear is choppy. Like a saw. If I try to cut paper the rear portion rips through it and the front cuts like a laserbeam. I ran my edge straight into a stone which smoothed it out but after I work on it for another half hour it leaves me in the same place, the front is sharp as heck and will take a burr, the rear won't and isn't.

At this point I'm kinda wondering if I've got a funky heat treat or my mad sharpening skills are just in my head? I'm not sure if what I'm looking at is chipping in the rear part of the blade or something else?(Using too low of grit stone? But I'm using the same stone on the front without the same issue?) I've never had this much of a problem getting something completely sharp though.:grumpy:

Any suggestions?

TIA,

Greg

 

[gud4u]

Keep grinding until the bevels intercept at the new edge angle.

When the bevels intercept, you'll raise a burr edge.

These knives generally come with rather obtuse edge angles suitable for good edge stability in rough service. Using a Sharpmaker for rebeveling a Ratweiler is tedious work. Most would use a coarse diamond or carborundum stone or supported sandpaper for rebeveling - even for smaller blades.

Hope this helps!

 

[Dog of War]

Hi, Greg. I've never seen a blade behave as severely as you describe, but I have had blades that were so brittle you couldn't get a decent edge, they would just crumble away. If you've really worked it as much as it sounds like, it almost has to be a bum heat treat IMO, which can happen to the best of 'em on occasion.

I'm sure the good folks at The Swamp will take care of you.

 

[Cliff Stamp]

I ran my edge straight into a stone which smoothed it out but after I work on it for another half hour it leaves me in the same place, the front is sharp as heck and will take a burr, the rear won't and isn't.

Technical diagnosis, the steel is boned.

-Cliff

 

[OilMan]

Keep grinding until the bevels intercept at the new edge angle.

When the bevels intercept, you'll raise a burr edge.

These knives generally come with rather obtuse edge angles suitable for good edge stability in rough service. Using a Sharpmaker for rebeveling a Ratweiler is tedious work. Most would use a coarse diamond or carborundum stone or supported sandpaper for rebeveling - even for smaller blades.

Hope this helps!

I am intersecting, I'm just not getting a burr. And I'm doing it on my Edgepro. Then I try to smooth out the visually toothy part of the blade with my SM rods but I can't get rid of it and it doesn't cut very well at all. (Although the front part of the blade cuts like it's going out of style.) I'm gonna contact the Swamp and see what options I have. Thanks guys.

Thanks,

Greg

ps. Cliff, I don't understand all that techno mumbo jumbo you wrote, can you write it in simpler terms so I understand?