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Can it be done? Either at home or by sending it out to CRK. Any one who has either tried or knows feel free to chime in
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Centering an old bg-42 regular
- Thread starter D.C.Johnson
- Start date
Centering should be easy if you've taken other CRK's apart and reassembled them. From your question, if sounds like you haven't taken a CRK apart before.
There is a sticky about taking a seb apart and putting it back together again. It's quite easy, you shouldn't have to send it to CRK.
There is a sticky about taking a seb apart and putting it back together again. It's quite easy, you shouldn't have to send it to CRK.
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It is a misconception to say that re-assembling the knife will always fix blade centering. Many CRK leave the factory with off-center blades that have nothing to do with the assembly or pinched washers. Perfectly centered blades is not something that CRK guarantees, or provides 100% of the time. Typically one wont leave the shop with the blade rubbing the scale, but they are not all dead-center. Many are, but not all.
So the question is, if the blade has a bow in it, can that be solved or corrected? I would like to know as well. I have a large Insingo, with less than perfect centering, and a small 21 with similar traits. Neither knife bothers me as they are users, but I would like to know if CRK could make them perfect. In both cases the blade is just ever-so-slightly warped.
Can a heat-treated blade be bent back true?
So the question is, if the blade has a bow in it, can that be solved or corrected? I would like to know as well. I have a large Insingo, with less than perfect centering, and a small 21 with similar traits. Neither knife bothers me as they are users, but I would like to know if CRK could make them perfect. In both cases the blade is just ever-so-slightly warped.
Can a heat-treated blade be bent back true?
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It's typically not worth the time to try and correct the bowing from my experience with other parts..Blade replacement I think would be the best option for the true nit-picker.
Blade centering can be a function of the washers being thinner than the rear spacer as well. Think about stacking the washers and blade, then measure that and compare it with the measurement from the rear spacer. If someone lapped the washer to make it smoother and was somewhat aggressive about it, then blade centering would be an issue..Of course, if the blade is ever so slightly bent, then this would magnify this effect.
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Just thought I'd mention...I just requested a "price list" for spa treatments, and it looks like you can no longer purchase new blades for a regular. Can anyone confirm or deny this?
The thought that I can't replace a regular blade makes me hesitant to use it in a "less than gently" fashion.
The thought that I can't replace a regular blade makes me hesitant to use it in a "less than gently" fashion.
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Good info, thank you. I have never been that bothered by it. They were like that from new, so I guess I assumed the washer stack would be the same height as the backspacer. Now that you have mentioned it, I will get out a caliper and check.
Thanks!
I guess I still have the question of whether a heat-treated blade can be bent, or if it would just fracture if you tried. I think I recall that in the Blade HQ vids Chris talks about the blades getting warped by heat treat and having some jig to straighten them. That is likely before the grind mind you.
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Good info, thank you. I have never been that bothered by it. They were like that from new, so I guess I assumed the washer stack would be the same height as the backspacer. Now that you have mentioned it, I will get out a caliper and check.
Thanks!
I guess I still have the question of whether a heat-treated blade can be bent, or if it would just fracture if you tried. I think I recall that in the Blade HQ vids Chris talks about the blades getting warped by heat treat and having some jig to straighten them. That is likely before the grind mind you.
It's possible to straighten a blade..There is a risk of breakage as lateral stress is applied. I guess it's much easier to say that steel is not glass and can withstand some stress. It would be fun for me to play with and try to figure it out on a knife, but it's also likely to be variable from knife-to-knife.
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Sorry to say but its all too true. Makes me want to not use my regulars, but then I can't help but pick up my large every morning when I leave for the shop! 😊
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The cool thing in the Blade HQ vid is that Chris doesn't let them film the jig he made. It's squarely off camera!
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I don't think it's accurate to say that "many CRK leave the factory with off-center blades," regardless of the reason, unless you're measuring out to 0.01 mm. If you're talking about a warped blade when you refer to a blade with a "bow" in it, that can happen, and I have had quite a few from other makers. That's easy to check if you have a truly accurate reference, such as a machinists' straightedge. I had a pair of 710HS knives (the M2 blades) that were so badly warped that Benchmade replaced them. In other cases, it's measurable but not a practical problem.
The advice to the OP is still the best advice: assemble the knife per CRK instructions and it should be very well centered. If not, report back here and/or get on the phone with CRK.
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No more spares...and I've been told they won't install double lugs in Regulars any more, either, because of the risk of cracking a blade they can't replace
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Thanks for your comments.
I have no idea what kind of logic would make my question imply I've never disassembled a crk?
I do not own the regular in question, but may purchase it and was wondering if off center regular blades can be centered or if maybe the tolerances weren't as tight back then. If i do ended up getting it I'll see if taking it apart works.
I have no idea what kind of logic would make my question imply I've never disassembled a crk?
I do not own the regular in question, but may purchase it and was wondering if off center regular blades can be centered or if maybe the tolerances weren't as tight back then. If i do ended up getting it I'll see if taking it apart works.
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SALTY
Gold Member
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I love CR Knives and the company is beyond reproach.
That said, am I to understand that if anything happened to the blade on my large regular Sebenza that I am SOL? That I would have a couple of Ti slabs and no chance of making it a knife again???
That said, am I to understand that if anything happened to the blade on my large regular Sebenza that I am SOL? That I would have a couple of Ti slabs and no chance of making it a knife again???
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It looks like that is exactly what you will have if the blade breaks (Severe Bummer). My compromise is that I'm buying a plain-jane regular for using vigorously. Not sure if I could bare it if I screwed up an annual.
In my short experience with all of my CRK's if the blade is off-center it means that my pivot screw worked loose because I've been watching TV and opening/closing it constantly for an hour. Easy enough to fix.
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I think the biggest culprit of blade centering is that the grind on the knife is slightly off-center. The blade stock might be dead even compared to each scale, but the tip of the blade can be ever so slightly closer to one side.
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I agree, the factory edge has a huge effect on the appearance of a centered blade. I've had blades magically center up after I sharpen the first time. I don't think I've ever seen a warped seb blade and I have doubts one would leave the factory.
It's usually either that or the PB washers. One may be sanded a bit more than the other in the final assembly of the knife. Definitely gives the appearance
of an off center blade with no scale rub when opening.
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Just last month I sent in a lg reg. BG-42 serrated to CRK. A small crack and started in one of the serrations. It is true they do not have any BG-42 Reg blades but they did replace it with a new S30V Rg. blade. So they do have Lg. Reg. Blades just not in BG-42.
I just got in a large reg S30V and thinking about sending it in for double lugs. Can anyone else also confirm they still offer this upgrade to the S30V blades. And do they still offer blade replacements as well?