Sharpening heavy knives and expectations

Joined
Dec 17, 2001
Messages
1,055
Is there any reason that I should not be able to get a 1/4" thick, hollow ground, 15 degree bevel (each side) blade "shaving"/push cutting sharp? Am I expecting too much slicing/shaving ability from such a thick slab of metal?

I've got a Ranger RD7 with 1095 steel, a hollow grind and a flat bevels (not convex), per order. It looks sharp. It feels sharp. I can plant my thumbnail on the edge and it won't move. I can look at the edge with my 15x loupe and see that the bevels meet, and that I'm grinding to the edge on both sides when I sharpen it. Also tried the marker trick. I can see the shininess of the edge change as I work through finer stones. It still more rips than cuts paper, won't shave, and won't even begin to cut through a piece of garden hose I have on hand.

I've got a Sharpmaker, DMT diamond hones, other stones, and I'm holding my angles steady. I can sharpen any one of my dozens of other knives, mostly thin-bladed pocket knives, and get them push-cutting, hair popping sharp in relatively no time. (Though I'll admit rebevelling Queen D2 gives me fits...)

I've got a BK&T Patrol Machete made from flat ground 3/16" stock that is razor sharp, and cuts all of the above with aplomb, including the garden hose. I've managed to maintain it in top condition for 5 or more years.

Am I expecting too much cutting performance out of a 1/4" knife? Do I just keep grinding away at the stones and hope someday I get an edge before I run out of steel, or my wife runs out of the house due to the constant scraping noise?

-- Sam
 
i put an edge on a hale knife that was 1/2" thick and made it shave so it can be done. it was a handfull to sharpen since the blade was around 16"-18" long.
 
Your hair may be harder to shave than some people's. I can't shave with a knife where the back bevel is higher than about 10 degrees per side. Besides acuteness in the vicinity of the edge the other drawback of a thick blade is elevated angle you end up with the blade tilted when you try and stroke it across your skin. You want to be more nearly horizontal for easy shaving. A hollow ground blade honed at 10 degrees per side should shave (particularly with 1095 alloy).
 
Back
Top