If CRK has the best F&F and tightest tolerances in production folders...

there is explosion welding used to bond dissimilar metals, I can't recall the maker, but he also did zipper blades that way. Miltner Adams had a model done that way as well (S30V/Ti). Also read an article years ago of a welding tech used to bond aluminum and steel for auto body frames.
 
I don't think the whole "tightest tolerance" thing matters very much as long as it's close.

these are folding knives here... not space ships.

don't get me wrong, I own CRK knives.. but I think the tight tolerance argument is pointless.

and zipper blades/composite blades serve no real purpose
 
I've used Aluminum that has been bonded to steel. In one application we used it on a 92 car Ferry Boat that had a steel hull and an aluminum bridge/upper deck.
So yes, dissimilar metals can we bonded, and it can even be welded in the field.
 
Bob Katilus said:
I think some folks are mistakenly confusing the fit and finish term with tight tolerance i.e. using them interchangeably. No one can really know if it has a tight tolerance unless they are looking at a print supplied from the manufacturer, in this case CRK. And, most likely the features will have different dimensional tolerances compared to others, and it would probably depend on the criticality of that feature. For example, the OD and perpendicularity of the pivot hole has probably a really tightly tolerance hole (who knows, maybe +/- 0.002")... which is important when if comes to blade play/ slop. But a much less critical feature, say maybe the overall length of the frame, might be +/- 0.020". And... who knows if the parts are meeting print? Sorry for getting stuck on the details, and I am not intending to put anyone off, but I think the question is really more focused on F&F.

BTW, I have a CR Sebenza and absolutely love it. They do a brilliant job with F&F- almost unfathomable on how tight the lock up is with ZERO play.
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+1 to this. You can have a custom knife whose tolerances are way off, but still have absolutely perfect fit & finish (due to making adjustments by hand). Conversely, you can also have a knife with tolerances to the Nth degree but have poor fit and finish (due to bad plan/design).
 
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