Author Topic: Metals that flex less than brass  (Read 1388 times)

Monkeyleg

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Metals that flex less than brass
« on: December 09, 2011, 11:52:42 PM »
A consistent problem with Italian stilettos is that the brass liners used in the blade channel flex when you push the button to open the knife, or even just when holding the knife. This causes the liners to make contact with the blade, and scratches the blade on opening or closing the knife.

Is there another metal that would be stiffer to use for liners, but which could be plated to look like brass? I think that someone who built a better quality stiletto than the well-known "craftsmen" in Italy could do a very good business.

kgbsquirrel

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Re: Metals that flex less than brass
« Reply #1 on: December 10, 2011, 12:10:07 AM »
Silicon aluminum bronze?

bedlamite

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Re: Metals that flex less than brass
« Reply #2 on: December 10, 2011, 12:30:34 AM »
I'd consider using a nickel alloy, no need to plate it.
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roo_ster

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Re: Metals that flex less than brass
« Reply #3 on: December 10, 2011, 12:33:32 AM »
How in the world is brass scratching steel?
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Monkeyleg

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Re: Metals that flex less than brass
« Reply #4 on: December 10, 2011, 12:41:08 AM »
It's brass against high-polished stainless steel. It's not deep scratches, but there's scratches.

bedlamite

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Re: Metals that flex less than brass
« Reply #5 on: December 10, 2011, 12:45:20 AM »
How in the world is brass scratching steel?


Grit easily embeds into the softer metal and acts as an abrasive to the harder metal.
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Monkeyleg

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Re: Metals that flex less than brass
« Reply #6 on: December 10, 2011, 12:50:22 AM »
So, I should somehow be cleaning the brass liners all the time? Polishing them?

It drives me nuts to buy a $200+ knife and see scratches on the blade after opening just a few times.

bedlamite

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Re: Metals that flex less than brass
« Reply #7 on: December 10, 2011, 01:00:37 AM »
It's going to be impossible to get it perfect. I'd be willing to bet there is steel dust embedded in the liners right from the factory, and any sand content in dust is going to do the same thing. I suggested Nickel because it's much harder than brass.

My $50 Buck has stainless steel liners and a pair of washers that the blade pivots on. It'll scratch under the washers, but you'll never see it.
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Jim147

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Re: Metals that flex less than brass
« Reply #8 on: December 10, 2011, 01:01:50 AM »
Silicon aluminum bronze?

Good stuff. We tested some rods made of that and they didn't give at over 10,000 RPM upside down at Brownsville.

I have to wonder if the grit isn't left over from making the knife. Maybe a super cleaning before opening would help. I know you just said $200+ but quality just isn't what it used to be.

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Azrael256

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Re: Metals that flex less than brass
« Reply #9 on: December 10, 2011, 01:08:50 AM »
Monkeyleg, I'm impressed.  Not only can you afford to buy Italian shoes, but you're comfortable enough to discuss it publicly.

 :lol:

Monkeyleg

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Re: Metals that flex less than brass
« Reply #10 on: December 10, 2011, 01:14:38 AM »
I've asked questions of a well-known custom knife maker who specializes in Italian style switchblades. He said that the flexing problem gets worse as the length of the knife gets greater. That makes sense, as there's nothing to the body of the knife but the backbone, the liners, the scale material, and the bolsters at each end. I have an 11" knife that has thick aluminum scales, and I can see a slight flexing of the liner when I press the button to open it.

I did look at the liners on one of my knives before opening it more than once, and saw some burrs and other stuff. I filed the burrs, cleaned out the channel, and it really helped.

The knife with the aluminum scales I mentioned was $525. The brass liners on that are highly polished, although I only opened it once when I took it out of the package.

I'm just ticked because I got a really nice 13" model with cocobolo wood scales, and the blade scratches worse than any of the other knives I have.

It seems to me that if the width of the channel were increased, and either washers were put between the tang and the bolster as mentioned earlier, or that section of tang that bears on the liners under the bolsters was thicker, there would be almost no rubbing of the blade against the liner.

I suspect the Italians are doing with knives what they do with so many other products, which is to make them the way they've always made them, regardless of advances in technology.

Azrael256, I don't get the joke, but I've worn Italian shoes before, especially in the 1960's. Cuban heels and pointed toes. That was cool.

tokugawa

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Re: Metals that flex less than brass
« Reply #11 on: December 11, 2011, 02:19:31 PM »



Azrael256, I don't get the joke, but I've worn Italian shoes before, especially in the 1960's. Cuban heels and pointed toes. That was cool.

  quick, somebody post a pick of some bright red "stiletto's"! =D

Monkeyleg

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Re: Metals that flex less than brass
« Reply #12 on: December 11, 2011, 02:53:40 PM »
Ah, those kind of stilettos. I like those, too, but on women. ;)

French G.

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Re: Metals that flex less than brass
« Reply #13 on: December 11, 2011, 05:25:56 PM »
I think titanium is pretty much the metal for liners, dunno if you can plate it though. It has a cool weird luster all its own if you polish it though.
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dogmush

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Re: Metals that flex less than brass
« Reply #14 on: December 11, 2011, 05:40:42 PM »
I think titanium is pretty much the metal for liners, dunno if you can plate it though. It has a cool weird luster all its own if you polish it though.

Ti's horrid mofo to machine though.  Custom making some one off liners could be a real pain.  unless you could find some sheet Ti and brake it.

ETA: I did find some sheet Ti.  How thick is the brass liner?

bedlamite

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Re: Metals that flex less than brass
« Reply #15 on: December 11, 2011, 05:47:17 PM »
I think titanium is pretty much the metal for liners, dunno if you can plate it though. It has a cool weird luster all its own if you polish it though.

Titanium galls easily, and it's not any stiffer than brass. It's mostly used in knives because of all the pretty colors you can get from it.
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Monkeyleg

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Re: Metals that flex less than brass
« Reply #16 on: December 11, 2011, 05:57:48 PM »
There's custom stilettos out there with titanium parts. They have that iridescent blue look which doesn't lend itself well to traditional Italian designs.

All of the liners I've seen are .040". There's one company that makes them a little thicker, but I can't remember which company.