It is currently Fri Oct 24, 2014 4:19 pm



Welcome
Welcome to chefknivestogo

You are currently viewing our boards as a guest, which gives you limited access to view most discussions and access our other features. By joining our free community, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content, and access many other special features. In addition, registered members also see less advertisements. Registration is fast, simple, and absolutely free, so please, join our community today!





 Page 1 of 2 [ 18 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: too sharp?
PostPosted: Thu Mar 20, 2014 7:39 pm 

Joined: Wed Mar 05, 2014 2:28 am
Posts: 258
I will soon be in the market for some new stones and was looking for input on the cutoff line for how high of a grit to stop at to maintain a functional, toothy edge. Im aware steel type makes a difference, so I have wusthofs and a 52100 sab artifex. My plan so far is shapton 1k/6k and a strop. Will I lose or gain performance if I do a 1k4k8k or is this something that only starts to happen at 16k, 32k? Im just curious to the cutoff.


Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Thu Mar 20, 2014 8:14 pm 

Joined: Thu May 24, 2012 6:20 am
Posts: 1840
The Wusthof will not benefit much past the ~2k range. The Artifex can go quite a bit higher, but most people stop in the 4-6k range.

Personally I like to have a bit tighter progression than 1k to 6k. So you might consider 1k, 4k, strops, or 1k, 2k, 6k, strops. Or something like that. The advantage of the 1k, 2k, 6k progression is with western steels, you can just stop on the 2k.


Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Thu Mar 20, 2014 8:50 pm 

Joined: Tue Oct 29, 2013 9:21 pm
Posts: 427
You got the right idea. Stopping at 6k will be just fine. You might to consider a 500,1k and a Japanese Natural Aoto not synthetic. That might give what you need.

Nothing wrong with a toothy edge.


Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Thu Mar 20, 2014 9:01 pm 
User avatar

Joined: Sun Oct 21, 2012 1:34 pm
Posts: 343
Yep Cedar and Umberto nailed it
You are wasting your time with any German steel sharpening past 2K, Wusthof is usually 56-58 Rockwell
Most of the Japanese knives Mark sells are 60 Rockwell and more.
There is a HUGE difference between 58 Rockwell and 60, the hardness increases exponentially.
I just got a Green Brick, it's a great stone for German or American steel.
Your Artifex, with AEB-L steel,
now you can go to a 400-600 grit stone for edge creation.
Then...
I go 1K, 2K, 5K, then strop on a 8K, then finish with more stropping on balsa with compound, and leather with compound
A final strop on bare leather.
I could not do this a year ago. I have learned a lot in this forum. That and some practice.


Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Thu Mar 20, 2014 11:24 pm 

Joined: Tue May 29, 2012 12:29 am
Posts: 920
The hardness increases exponentially.


No it doesn't.


Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Fri Mar 21, 2014 4:59 am 
User avatar

Joined: Tue Oct 30, 2012 12:20 am
Posts: 625
I like 8k.. (on my stone)



_________________
http://nbthk-ab.org/index.htm
Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Fri Mar 21, 2014 6:56 am 

Joined: Thu Jan 30, 2014 10:57 pm
Posts: 154
Jason B. wrote:
The hardness increases exponentially.


No it doesn't.


The Rockwell scales are quasi-logarithmic, which means a given interval is more significant the higher you go on the scale. The scales themselves are arbitrary so it would be pointless to argue exactly how the intervals change.


Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Fri Mar 21, 2014 12:55 pm 

Joined: Tue May 29, 2012 12:29 am
Posts: 920
Dakki wrote:
Jason B. wrote:
The hardness increases exponentially.


No it doesn't.


The Rockwell scales are quasi-logarithmic, which means a given interval is more significant the higher you go on the scale. The scales themselves are arbitrary so it would be pointless to argue exactly how the intervals change.




Rockwell hardness is measured of indentation hardness, measured from the preload to the large load. The distance between the two load points are then equated into a number. The measurement is 0.002in per point of hardness.

I've use hardness testers and it was my thought too that they were on a exponential scale until the operator that had been using the machine longer than I have been alive told me otherwise. It's a measure of how deep the indented goes and is on a linear scale.


Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Fri Mar 21, 2014 6:09 pm 

Joined: Fri Nov 01, 2013 1:00 pm
Posts: 24
If the depth vs rockwell number is a linear relationship, then rockwell number vs the hardness is not. The first .001" is easier than the 2nd .001", and so on.


Offline
 Profile  
 
 Post subject: Re: too sharp?
PostPosted: Fri Mar 21, 2014 7:09 pm 

Joined: Thu Jan 30, 2014 10:57 pm
Posts: 154
Jason B. wrote:

Rockwell hardness is measured of indentation hardness, measured from the preload to the large load. The distance between the two load points are then equated into a number. The measurement is 0.002in per point of hardness.

I've use hardness testers and it was my thought too that they were on a exponential scale until the operator that had been using the machine longer than I have been alive told me otherwise. It's a measure of how deep the indented goes and is on a linear scale.




What needs to be understood here is that you're measuring one dimension of a three-dimensional indentation. You're displacing a lot more material going from 20 to 21 HRC than from 65 to 66, and because the scale goes up as the amount of material displaced goes down, that means the difference in hardness also goes up as you go up the scale.


Offline
 Profile  
 
Display posts from previous:  Sort by  
 Page 1 of 2 [ 18 posts ]  Go to page 1, 2  Next


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  


suspicion-preferred