MEMBER ITEMS FOR SALE
Custom Knives | Other Knives | General Items
-------------------------------------------
New Posts | New PhotosAll Photos



Go Back   The Knife Network Forums : Knife Making Discussions > Custom Knife Discussion Boards > Knife Making Discussions > The Newbies Arena

The Newbies Arena Are you new to knife making? Here is all the help you will need.

Reply
 
Thread Tools Display Modes
  #1  
Old 07-11-2002, 01:56 PM
hiddengeek hiddengeek is offline
Registered
 
Join Date: Jul 2002
Location: North Aurora, IL
Posts: 6
Question How sharp is sharp?

Ok people, new to knife making here and reading a lot of the posts and how-to's, I come across a mention of a test of free hanging rope being cleanly sliced.
Personally, I don't think I have ever seen a knife that sharp, so my question is, how sharp is sharp?
I can't see a fresh razor slicing a free-hanging rope, or a gently falling piece of silk onto a blade.
Actaully, I don't think I would want something laying around my house that was that sharp, being somewhat of a clutz occasionally, but still would be neat to see.
What is used for this sharpness?
Diamond, water stones, buffing, stropping...?

Thanks!
Eric
Reply With Quote
  #2  
Old 07-11-2002, 04:02 PM
Bob Sigmon's Avatar
Bob Sigmon Bob Sigmon is offline
Moderator
 
Join Date: Jun 2002
Location: Plymouth, MI
Posts: 1,228
Eric,

I'm pretty new here but .............how sharp is sharp? To get what Jerry Hossom calls wicked sharp starts well back from the edge of the blade. The types of steel that are used will be the basis of how sharp you can get the edge and how long it will retain that edge.

Forgers will use 52100 to great effect. The secret to this steel is the forging where the grain of the steel is refined while the blade is shaped under the hammer. Once the blade has been forged they heat treat the blade normalizing, multiple quenching , multiple tempering with cryo treatment thrown in. This all leads to refinement of the grain, which leads to being able to sharpen the blade to "wicked sharp".

The top steel for stock removal guy is Crucible's S-3V. Again, this fine grained steel is the basis for a great edge. The egde geometry will also help determine how long your edge will last. Typically, a convex edge on the blade will last longer than a very flat thin edge.

This is just the ramblings of a newbie, but with the knowledge derived from some great makers. If I am of base, someone let me know!

Final sharpening is done by various methods and each maker will use the "system" that they have developed and works for them.

A final thought on a sharp blade. A sharp blade will cut with much less force than a dulll blade. Dull blades cause you to use extra force and once you break through what is being cut the follow through my lead the blade to your leg, arm or some thing else that you don't want cut. A sharp blade just cut what you want cut. You know that it is sharp and you treat it that way.

I hope that this helps.

Bob Sigmon
Reply With Quote
  #3  
Old 07-11-2002, 08:18 PM
BrianT's Avatar
BrianT BrianT is offline
Skilled
 
Join Date: Jun 2002
Location: S.E Ia
Posts: 383
Hi Eric

The cutting through the 1" free hanging rope is part of the test for a knifemaker to become a Journeyman and Master within the American Bladesmithing Society. One must also be able to chop through a 2X4 twice and still be able to shave hair with the blade. The knife must then be bent to 90 degrees without breaking. There is a how to article by Ed Caffrey that outlines how to make a knife to pass the ABS Journeyman test on this site and his site. This will give you an idea of what is involved in forging a knife that is sharp yet tough. Further info on www.americanbladesmith.com. This is ABS's site.

Brian
Reply With Quote
  #4  
Old 07-12-2002, 08:46 PM
Jason G Howell Jason G Howell is offline
member
 
Join Date: Jun 2002
Location: Brazoria, Texas
Posts: 90
Notwithstanding heat treat, the rope cut relies on edge geometry as much, if not more, as sharp to get through the rope. That same edge geometry that does rope like crazy will not do the 2x4's as well, maybe folding on you. The trick is getting it right to do both tasks. Just steep enough of an edge for rope, but enough meat left so it won't fold on the 2x4's. This can't be taught, but you must try it and see for yourself. Playing is fun and teaches you so much about your knives. I can make mild steel cut rope... once!


__________________
Jason G Howell
ABS Journeyman Smith
howellknives@yahoo.com
http://www.howellbladesmith.com
Reply With Quote
  #5  
Old 07-13-2002, 07:46 AM
hiddengeek hiddengeek is offline
Registered
 
Join Date: Jul 2002
Location: North Aurora, IL
Posts: 6
Quote:
The top steel for stock removal guy is Crucible's S-3V.
Being someone who has only made one complete knife, screwed up the second, and both from old circular saw blades, is S-3V the same as S30V?

Thanks,
Eric
Reply With Quote
  #6  
Old 07-13-2002, 07:53 AM
Don Cowles's Avatar
Don Cowles Don Cowles is offline
Founding Member / Moderator
 
Join Date: Jun 2002
Location: Royal Oak, Michigan
Posts: 2,192
Send a message via AIM to Don Cowles
In a word, no. They are both made by the same company (Crucible), and are both fine steels, but they are different. S3V is not stainless, for example, where S30V is.


__________________


Don Cowles Custom Knives

Reply With Quote
  #7  
Old 07-15-2002, 04:15 PM
Chris_Crawford's Avatar
Chris_Crawford Chris_Crawford is offline
Steel Addict
 
Join Date: Jun 2002
Location: Saltillo, MS - USA
Posts: 294
The most impressive cut that I've seen was at this past Batson's Bladesmithing Symposium. Part of the cutting contest was to cut through a 1" rope hanging from two pieces of upholstery thread without breaking the thread. Two people did it. I wouldn't believe it if I had not seen it.

-chris


__________________
Chris Crawford


DVDs & Tutorials are available at http://chriscrawfordknives.com
Reply With Quote
Reply

Tags
blade, forging, knife, knife making, knives


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -5. The time now is 05:11 PM.




KNIFENETWORK.COM
Copyright © 2000
? CKK Industries, Inc. ? All Rights Reserved
Powered by ...

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
The Knife Network : All Rights Reserved