Regrind on a laminated blade

Rasco

Rasco

Joined
Jan 3, 2014
Messages
2,028
What would this look like? Anyone out there had this done?
I ran it by Josh at REK and (I can't find the email thread right now, forgive me for paraphrasing) he seemed to think it was reasonable.
Would it just raise the laminate lines so that it was closer to 50-50 rather than 80-20? Because that would be an awesome looking additional benefit :D

Any reason this might go wrong? Something I'm not considering when it comes to the lamination process that would be degraded by a regrind?

I have a super blue Endura and a HAP40 Endura and I'd love a regrind on either. I may send Josh the super blue Endura just to see what happens / how it turns out
 
I have seen a few.

I have seen a SB stretch and a SB Delica both zero ground or at least zero convexed.

A guy named Cliff Stamp did it to a Delica and a forum member on here BrockOLee did it with a SB stretch. They both used bench stones I believe. The one factor may be that you will grind the non stainless steel into the stainless steel and get some strange staining. Of course this is a problem on factory knives and my laminated blades show it a little from the factory grinding.
 
Shouldn't be a problem, that's how the factory blade is produced, they have to grind it to shape, one may be able to figure out where the grind line will end up, the thickness of blade, the core, the lamination, girth of the blade stock, the angle you are aiming for etc... Any physics major here?
 
Here's my approximate measurements of Spyderco hap40 blade thickness.
Endura spine .110", lamination mark .035"
Delica spine .095", lamination mark .030"
Dragonfly same as delica.
 
Rasco said:
Could Brock post some pics...?
Click to expand...

Hi Rasco,

I believe the Japanese use soft laminates precisely for the purpose of regrinding. It enables a user to easily thin out a blade by removing metal from the primary grind using bench stones.

Pics for you:

(Bottom one is my NIB backup)
2015-05-19072806-small_zps1f9ceaf9.jpg


20150325_190500-small_zpsholgkaxj.jpg


20150325_190418-small_zps5fjusvb8.jpg


DSC_0012.2-small_zpsxvtgufpi.jpg


This "regrind" is a full height convex, with a coarse micro bevel. I've been using it like this for about 16 months, and I absolutely love it. An unexpected benefit was that it straightened out the lamination lines somewhat. There was no contamination between the carbon steel and stainless steel that I could see. I have not seen weird corrosion issues either.

A FFG regrind will show more of the core steel, as it raises the lamination lines. I do not think you'll get to much more than 30-70, unless you thin the spine too.

My advice would be to go for it. It turned an average cutter into a super performer, and one of my favorite users. My new HAP40 Stretch will probably stay new as long as I do not lose or break this thin SB Stretch.
 
Last edited:
Thanks for the pics Brock!
I think you're right about the 30-70. After seeing yours, the carbon steel doesn't show as much as I imagined it would. But I would probably go for a thinner regrind on mine...

I'll have to send one off to Josh or Big Chris and just see how it turns out.
 
You must log in or register to reply here.
Back
Top