Hey guys,
I am a machinist in my spare time and I have some questions for driving bands as I will be turning my own projectiles for a ~1"/25mm bore cannon.
First, can anyone point me towards some good info about the swaging process of applying the bands to the (in my case, steel) projectiles? Mainly I am looking for process details so that I can obtain proper data in order to create dimensions and machine the correct type of swaging dies for application of the bands.
Second, it would be great to have any other general info about the driving band design itself, such as proper materials used to create the bands, design as it applies to rifling engagement, or pressure and/or velocity, etc.
I can of course copy existing projectiles by sectioning and studying their overall design if that's what I have to end up doing.
I did spot something that threw me off when I was scraping the paint off of a 25mm TP projectile on the driving band. I expected to see brass when I started taking the paint off the projectile, but instead it appears that this target practice projectile does not in fact have a swaged-on band--instead the projectile body appears to be one piece, and the driving band actually looks to be made of the same thing the projectile body is made of, that being steel. The band is not the typical type as seen on say 20mm Vulcan TP design with a single raised plateau of band, rather the band has a ring groove turned in the middle to create two smaller bands (like rings) of engagement. If I have to I will make a cut to ensure it's all the same material as one piece, but from the small amount of paint so far removed it does look to be steel the band is made of. This threw me off obviously because one would think a steel band would tear the rifling up!
I appreciate any help I can get here, thanks!
I am a machinist in my spare time and I have some questions for driving bands as I will be turning my own projectiles for a ~1"/25mm bore cannon.
First, can anyone point me towards some good info about the swaging process of applying the bands to the (in my case, steel) projectiles? Mainly I am looking for process details so that I can obtain proper data in order to create dimensions and machine the correct type of swaging dies for application of the bands.
Second, it would be great to have any other general info about the driving band design itself, such as proper materials used to create the bands, design as it applies to rifling engagement, or pressure and/or velocity, etc.
I can of course copy existing projectiles by sectioning and studying their overall design if that's what I have to end up doing.
I did spot something that threw me off when I was scraping the paint off of a 25mm TP projectile on the driving band. I expected to see brass when I started taking the paint off the projectile, but instead it appears that this target practice projectile does not in fact have a swaged-on band--instead the projectile body appears to be one piece, and the driving band actually looks to be made of the same thing the projectile body is made of, that being steel. The band is not the typical type as seen on say 20mm Vulcan TP design with a single raised plateau of band, rather the band has a ring groove turned in the middle to create two smaller bands (like rings) of engagement. If I have to I will make a cut to ensure it's all the same material as one piece, but from the small amount of paint so far removed it does look to be steel the band is made of. This threw me off obviously because one would think a steel band would tear the rifling up!
I appreciate any help I can get here, thanks!