Driving and Rotating Bands

Question 1

Why are driving bands required?

Answer 1

Centre projectile in bore and impart spin.

Prevent the forward escape of propellant gases.

Assist in prevention of slipback of the projectile when loaded at high elevations.

Question 2

Requirements for a Driving Band

Answer 2

No excessive pressure on the shell or barrel.

Cater for change in bore diameter (wear).

Remain firmly attached to the projectile.

Must not alter the ballistic shape of the projectile (engraved state).

Cause no excessive friction or bore wear.

Simple to make and fit

Question 3

What are the methods of preventing twisting?

Answer 3

Wavy Rib
Knurling

Question 4

What are slipping rings used for?

Answer 4

Slipping rings are designed to ensure that the spin imparted by the weapons barrel does not reach a rate that would influence the fin stabilisation of a projectile or would reduce the effectiveness of a hollow charge

Question 5

Types of driving bands.

Answer 5

Orthodox Band: Modern band: Double Band: Gas Check Type: Probert:

Question 6

Requirements of a slip ring.

Answer 6

Should breakup on leaving the barrel
Should breakup into particles small enough so as not to harm friendly troops
Chances of any fragments remaining in the barrel should be minimal
The ring should still engage the rifling and not soften under bore temperature

Question 7

Slip Ring Materials

Answer 7

Plastic: Nylon. Vulcanised rubber. Polycarbonate: Makrolon

Question 8

Bore-Riding Nubs / Bands provide what?

Answer 8

Provide stability for streamlined projectiles