Question regarding BG-42 Millie

L

LJK

Joined
Dec 6, 2004
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156
This question must have been came up before, but I searched and couldn't find an answer. Why did Spyderco put two liners in the new millie? Also CF is stiffer and better looking (and maybe grippier) then G10. Any other advantages? Thanks. :confused:
 
I don't know the answer, but because of that decision, I am going to finally give in and get one. I refuse to buy folders without dual liners (I also refuse to turn left on Tuesday nights...)
 
As far as I know, the second partial liner is just part of the continuing evolution of the Military model, and will appear on them from now on. As far as the carbon fiber goes, it is a bit lighter than G-10 as well, and the peel ply on my BGCF Mili is definitely more grippy than the G-10 on my Paramilitary. :thumbup:
 
Could someone explain to me what the term "peel ply" refers to in regards to carbon fiber. I probably should just do a search, but I bet there might be a few others who aren't familiar with the term. Does it have something to do with the texturing or repeating pattern of the grain on a paticular kind of carbon fiber ...just taking a stab here.

Is it obvious I don't own any knives handled in carbon fiber ?.

-regards
 
Gramps said:
Could someone explain to me what the term "peel ply" refers to in regards to carbon fiber. I probably should just do a search, but I bet there might be a few others who aren't familiar with the term. Does it have something to do with the texturing or repeating pattern of the grain on a paticular kind of carbon fiber ...just taking a stab here.
Click to expand...

I'll give an overview, trying not to use shop talk and not overly much detail. Please pardon if I go too far.

G10 and carbon fiber (CF) are laminates. The fibers are held together by epoxy resin.

For CF laminates, you start with carbon fiber cloth. The cloth is dipped in a resin solution, then run through an oven to drive off the solvent. (You do that oven drying VERY carefully.) This is done by a company that formulates the resin and produces this pre-impregnated fabric. They sell their product to a comapany that makes the laminates.

To make a laminate, you stack layers of the resin impregnated cloth, then expose it to heat and pressure. The heat cures the resin and voila, you got laminate.

"Peel ply" is an outer layer of dry cloth that is applied prior to the cure. During the cure, the resin gets runny and the dry cloth sort of sticks onto the surface. After the cure, you can pull (peel) off this outer ply. It pulls of some of the resin and you get a rough surface.

We do this all the time if we are planning to perform further bond work with the laminates we make.

Hope this helps .
 
I'll give an overview, trying not to use shop talk and not overly much detail. Please pardon if I go too far.
Click to expand...
...perfect ! Great description. I don't want to hijack this tread......but as long as we have someone who is so knowledgeable here......what are some other typical application for carbon fiber laminate beyond knife handles ? .....and is the micarta "process" very similar to the carbon fiber "process".......the former utilizing paper or linen and the later carbon fiber.....is one "stronger" than the other or is that purely a function of the resin that is used in the the bonding stage ?
Thanks for your help on this...I'm assuming others will be interested in this too.

-regards
 
Gramps said:
...perfect ! Great description. I don't want to hijack this tread......but as long as we have someone who is so knowledgeable here......what are some other typical application for carbon fiber laminate beyond knife handles ? .....and is the micarta "process" very similar to the carbon fiber "process".......the former utilizing paper or linen and the later carbon fiber.....is one "stronger" than the other or is that purely a function of the resin that is used in the the bonding stage ?
Thanks for your help on this...I'm assuming others will be interested in this too.

-regards
Click to expand...

Gramps,
Thank you for asking the question you did, as I, too, am interested in this subject. And to answer one of your questions, I know Carbon Fiber is used in everything from bicycle frames, to car hoods, to pistol holsters, to the space shuttle. I imagine that Carbon Fiber is used for any application that requires a light-weight, weather and chemical resistant, high tensile strength material.

http://en.wikipedia.org/wiki/Carbon_fiber

Regards,
3G
 
I know Carbon Fiber is used in everything from bicycle frames, to car hoods, to pistol holsters, to the space shuttle. I imagine that Carbon Fiber is used for any application that requires a light-weight, weather and chemical resistant, high tensile strength material.
Click to expand...
.....hmmm...interesting. I wonder what it's melting point is ?......is it particularly rigid by nature, or does it have some "toughness" and flexibility ? I wonder if it's used in building/structural applications. Forgive me I am hijacking this thread...I apologize and will shut up now....sorry !

-regards
 
No apologies necessary here. Any info regarding BG42/CF Millie is most welcome. I still would like to know what Spyderco was thinking when they added a second liner.
 
I still would like to know what Spyderco was thinking when they added a second liner.
Click to expand...

This is the kind of question that the Spyderco forum often discusses, or will if you ask there. :)
 
Gramps said:
...perfect ! Great description. I don't want to hijack this tread......but as long as we have someone who is so knowledgeable here......what are some other typical application for carbon fiber laminate beyond knife handles ? .....and is the micarta "process" very similar to the carbon fiber "process".......the former utilizing paper or linen and the later carbon fiber.....is one "stronger" than the other or is that purely a function of the resin that is used in the the bonding stage ?
Thanks for your help on this...I'm assuming others will be interested in this too.
-regards
Click to expand...
Howdy,
Sorry for the delay, west coast time and my daughter was doing her homework on the computer.

Well, as for my company, we build aircraft parts out of the stuff. The new Boeing 787 will be something like 50% laminate construction. "Graphite" shaft golf clubs utilize carbon fiber laminate. Carbon fiber laminates are used where light weight and stiffness are desired. The actual material properties vary with the orientation of the fibers, the diameter of the fibers, and the resin used to hold it all together. G10 uses epoxy resin and the carbon laminates found on knife handles most like ly do also.

Carbon fiber laminates (G10 glass laminates too for that matter) are called anisotropic materials. Their properties are directional. they are strong in the plane of the laminate, more especially, they are strong int the direction of the fibers. They are stronger in tensile than in compression. If you push on them (or pull them) from a direction not in the plane, they fail rather easily. Micarta is a different deal. The properties are more uniform because the reinforcment is not so directional. I think micarta is denser. Not sure, I never played with it. We don't use it to build airplanes.

This could go on for a bunch of pages. People write text books about this stuff. But I hope that answers some of your questions.

Sorry if we took the thread on a left turn. --knarf-eng
 
Sorry if we took the thread on a left turn. --knarf-eng
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...me too, but I found your explanations interesting and I learned something new !;)

I think micarta is denser. Not sure, I never played with it. We don't use it to build airplanes.
Click to expand...
...surely Howard Hughes must have tried at some point ? :D

-regards
 
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