As I study about the Raptor I'd like some edification about the TJ Barrel. they use the Lothar Walther Barrel on all the other models except the slugs & the 30s. I'm not clear about the TJ barrell and what the significance of it is.
TJ BARRELS
- Thread starter Keyman62421
- Start date
Key, whatca need to know? Google will pull up a bunch of threads regarding these barrel liners. Naturally there can be plus and minus's to using any brand barrel depending on what your after. You might be able to give Mike a call with specific questions.
Mr Sayer
TJ's Enterprises
3652 Neltner Rd
Alexandria, KY 41001
859-635-5560
John
Mr Sayer
TJ's Enterprises
3652 Neltner Rd
Alexandria, KY 41001
859-635-5560
John
Upvote 0
Cold Hammerforged barrels add rigidity because of the way the metal is elongated during the process. Also because of the process you get very concentric to bore barrels that need little polishing. They are steel tubes forged around a mandrel that matches the groove and land dimensions for the desired barrel. My absolute favorite barrel made for airguns. Well, adapted to airguns.
Upvote 0
Beyond manufacturing process ...
The Rifling is VERY shallow relative to say LW barrels making for a lower drag bore. With less height differential between Land & Groove the Hammer forging process has the edges of the land Sharper than a button rifling process.
So even tho the land / groove is shallow the ability to mitigate "Skid" of the projectile leaving the rifling profile is also minimized due to the nature of this profile. Also most at 6 groove and some *4 groove (* .177's ) which has the most of a projectiles diameter within the groove and getting sealed, and the Land lightly embedding into it crisply imparts the spin.
The Rifling is VERY shallow relative to say LW barrels making for a lower drag bore. With less height differential between Land & Groove the Hammer forging process has the edges of the land Sharper than a button rifling process.
So even tho the land / groove is shallow the ability to mitigate "Skid" of the projectile leaving the rifling profile is also minimized due to the nature of this profile. Also most at 6 groove and some *4 groove (* .177's ) which has the most of a projectiles diameter within the groove and getting sealed, and the Land lightly embedding into it crisply imparts the spin.
Upvote 0
That s a strange claim to say that forging adds rigidity.
Steel and stainless steel have very consistent modulus that does not change with heat treatment.
The only way to make one steel barrel more rigid than another steel barrel is to change its shape/size.
David
Upvote 0
i do not agree
heat treatment does change the properties of steel, it's hardness and rigidity... changing the austenite to martensite
forged steel will compact the crystals that form leaving less space between...strengthening their bonds
Blued steel is going to have more flexibility than hardened steel
Upvote 0
Hardness changes. Yield strength changes. Ultimate strength changes.
Rigidity does not. Only operating temperature changes rigidity and for steels that doesn’t become measurable until a few hundred degeees.
Rigidity does not. Only operating temperature changes rigidity and for steels that doesn’t become measurable until a few hundred degeees.
Upvote 0
i looked up rigidity...inability to be to bent or be forced out of shape
i can take the same piece of steel ..heat treat one and heat the other to "blue"
one is easily bendable where the other is stiff
i would think that it goes within the definition that the rigidity is changed
but i might be missing your point...this is the way i see it
i can take the same piece of steel ..heat treat one and heat the other to "blue"
one is easily bendable where the other is stiff
i would think that it goes within the definition that the rigidity is changed
but i might be missing your point...this is the way i see it
Upvote 0
Rigidity in engineering terms is the deflection of a material in its elastic range: ie below the yield point. It is quantified as elastic modulus ‘E’. Also called stiffness.
This is the rigidity property that affects harmonics during the shot.
If at any point a barrel or knife changed shape permanently, material has yielded and it’s effectively failed. Therefore the properties that matter to us are within the elastic range.
Heat treatments, grain structure, hardness, temper, etc affect behavior at or above the yield point. While these effects are very significant they are outside of the range of the situation of barrel behavior.
This is the rigidity property that affects harmonics during the shot.
If at any point a barrel or knife changed shape permanently, material has yielded and it’s effectively failed. Therefore the properties that matter to us are within the elastic range.
Heat treatments, grain structure, hardness, temper, etc affect behavior at or above the yield point. While these effects are very significant they are outside of the range of the situation of barrel behavior.
Upvote 0
if rigidity is the same ...would harmonics also be the same?
all barrels would have the same harmonics?
not being a smart a** ..i really do not know and am curious
all barrels would have the same harmonics?
not being a smart a** ..i really do not know and am curious
Upvote 0
Harmonics can change slightly because different grain structures can have slightly different density.
You could certainly test this by making a tuning fork and measuring its frequency before and after hardening.
You could certainly test this by making a tuning fork and measuring its frequency before and after hardening.
Upvote 0