NY State Wants To Treat 3D Printers As Guns

Likeicare said:
You are getting confused between what is needed for making a gun at home, and what is necessary to create a mass produced reliable and quality product designed to fire tens of thousands of rounds and pass government regulations
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you cannot cast a barrel that is safe and easily useable which is meant to fire modern ammo. Period.

You confuse the term "regulations." There is no government regulation(s) on the reliability of a firearm. Only manufacture is limited to how the gun operates, full auto or semi. The market decides that.

Case in point, the Hi Point. It's difficult to aim and fire accurately due to the massive slide mass, however, since they are so cheap people buy them just in case. Taurus is another firearm manufacturer that has serious reliability issues. Same with Kimber. People still buy them, I own a Kimber but it's no longer something I carry day to day. It's a BBQ gun. A show off. it's pretty and it will do the job but I wouldn't rely on it. However, it does get more reliable as I put more round through it. This is commonly known as user finishing. Normally, the firearm is reground to adjust tolerances to make it reliable, It's part of the QC process. A high number of rounds will "lap" the firearm into proper working specs. I have over 3K though that pistol alone and I'm guessing it will take another 6K to make it as reliable as my CZ's.
 
Call Me Tim said:
The barrel cast would be impractical. You evidently know nothing about casting metal. I have some limited experience. Casting metal is not uniform or reliable in strength and durability.

You don't know what you are talking about.
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US standard rifle used to be the 1873 Springfield using a cast iron barrel firing 45-70 black powder rounds at 20,000+ psi

Pressure of a 45acp maxes out at around 20,000psi, is only around 17,000psi on many rounds


You don't know what youre talking about
 
Likeicare said:
US standard rifle used to be the 1873 Springfield using a cast iron barrel firing 45-70 black powder rounds at 20,000+ psi

Pressure of a 45acp maxes out at around 20,000psi, is only around 17,000psi on many rounds


You don't know what youre talking about
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The original 45-70 loading was designated 45–70–405, referring to a 45 caliber bullet, 70 grains of black powder, and a 405 grain lead round nose bullet.

Smokeless power is a propellant, not an explosive an generates much higher pressures.

The 45ACP makes 20K PSI in a 5 inch barrel. To use 70 grains of smokeless powder out of a typical 18 inch barrel would generate far more than that.

Again it is you who doesn't know what you are talking about.
 
Call Me Tim said:
The original 45-70 loading was designated 45–70–405, referring to a 45 caliber bullet, 70 grains of black powder, and a 405 grain lead round nose bullet.

Smokeless power is a propellant, not an explosive an generates much higher pressures.

The 45ACP makes 20K PSI in a 5 inch barrel. To use 70 grains of smokeless powder out of a typical 18 inch barrel would generate far more than that.

Again it is you who doesn't know what you are talking about.
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whats the differencce between a propellant and an explosive and dont go running to wikipedia.
 
Call Me Tim said:
Black powder < smokeless powder.
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Likeicare said:
I don't understand barrel pressures.
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A 45 generates the same psi in a far shorter barrel. As the smokeless powder burns, the goal is to keep the pressure the same during the bullet travel.

A 4570 generates all it's power at the moment and the few moments after ignition. It is a fixed charge of pressure like an airgun. As the bullet travels down the barrel, the volume is increased and the pressure DROPS. How do you not understand this?

That's the nature of black powder.

"For the Springfield Model 1873, the barrel was manufactured to be milled out at the rear to accommodate the trapdoor breechblock mechanism. This involved converting existing percussion rifled muskets by milling out the rear of the barrel and inserting a new barrel liner to fit the .45 caliber round. The barrel was rifled to impart spin to the bullet for better accuracy."

The gunsmith master and his journeyman heated a long piece of wrought iron in a forge.
  • First the barrel was fashioned from flattened wrought iron that was hammered and wrapped around a steel rod to prevent the tube collapsing. When the rod was removed, the result was a hole in the center that would be smaller than the finished hole.
  • Secondly, the hole was enlarged, cleansed, and polished through precise boring to fit the caliber of a particularly sized shot or bullet.
  • For rifle barrel, it required the additional boring of grooves along the inside tube called ‘rifling.’ This set the bullet spinning as it was launched. This stabilized the shot to assure better accuracy.
revolutionarywarjournal.com

How Colonial Gunsmiths Forged Musket and Rifle Gun Barrels

From a flat bar of soft iron, hand forged into a gun barrel; laboriously bored and rifled… in a shop long since silent, fashioned a rifle which changed the whole course of world history. …
revolutionarywarjournal.com revolutionarywarjournal.com

Forged not cast. Black powder not smokeless. Why are you still arguing?
 
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