Sebenza Tolerances

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redbird063

Joined
Aug 28, 2012
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I was just wondering if anyone has a CRK folder, and could tell me the differences in the thickness of the handle slabs. I measured my Sebenza scales to be .125"(non-locking side) and .127"(locking side). Is this .002" difference normal?
 
Watch the Blade HQ vids on his shop tour 2 thousandths is his max variance if I remember right.
 
I know it's a small measurement. I just wanted to make sure that it was a normal tolerance for CRK.
 
redbird063 said:
I know it's a small measurement. I just wanted to make sure that it was a normal tolerance for CRK.
Click to expand...

Out of curiosity, what tolerance were you expecting? Serious question.

There are some parts that the tolerance is .0002 or so, but that would not be required of something like a scale. It adds cost and removes consumer value.

Normal human hair is right around .003-.005in
Most tolerances that aren't specified are right around .005in.

I don't doubt that the tolerance on the scales is .002.. The fact of the matter is, if the machinist is standing around checking them and they are within tolerance, then there is no reason to subject the parts to further machining processes. It's an old mantra of "the more you touch it, the more chances you have of scrapping it".
 
The thickness of the scale really wont have an effect on how the tolerances effect operation. LOL.
That said almost every machinist I know manufacture parts within 5 thousandths. I am pretty sure that the rest of the interior parts are where it matters most.
I was making some parts with a friend of mine . These parts are for the imaging in high tech MRI machines out west. Something to do with the interior lazer of some sort. Anyway, even that was -+ 10..
Put your vernier caliper back in the case.
 
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Besides the fact that the very small differences in thickness have no effect on the function of the knife I wonder: how did you measure the thickness?
Did you use a vernier caliper or a micrometer?
It is impossible to measure that accurate with a vernier caliper because of the pressure differences of every single messurement.
If you use a micrometer you can use the slip action clutch for accurate messurements.
When i am making parts for mijn knives i use the vernier caliper for rough messurements and the micrometer for fitting parts and checking the digital read out of my lathe.

More important for good fit and finish are the differences in thicknes on each titanium slap itself ;front to back ,left to right.
If you feel the action on every sebenza ( at least every sebenza i tried;) ) you will notice that while moving the blade without presure of the lockbar (lift the lockbar a bit) there are no differences in drag.
The handles of the sebenza's I handled where perfectly aligned !

kind regards,
dirk
 
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