BRVN Series

Precihole Broach Rifling Machines incorporate state-of-the art features to form precision grooves in grenade launcher barrels. The broach tool is pulled and rotated precisely through the barrel. The machine uses anti-backlash helical guides and rotary encoders to interpolate linear and rotary motions. This combination produces highly precise twists in the barrel. Rifling operation is extremely fast at 40–50 IPM pull feeds.

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Machine Mechanism

• This machine is a rifling machine that uses a broach tool to cut grooves in barrels
• The barrel is chucked in the 3 jaw self-centering chuck for rigidity and complete support
• The broach rifling tool is clamped on the spindle
• The program to broach grooves is brought up on the HMI console with the preferred options
• The guide rod advances through the barrel and the operator loads the tool on the other side
• The tool is programmed to pull through the barrel and rotate a certain turn to achieve the desired twist rate for the barrel. This is called two axis interpolation.

• The appropriate speed / feeds are selected, and the cycle is started.
• The tool cuts the grooves in the barrel when it is pulled through the barrel.
• Tool mounting & dismounting to be done manually at entry & exit of barrel.
• Once operation is complete, tool is disengaged, and part is removed.
• The chips fall down and are collected in a tray that is cleaned regularly once filled.
• The cutting oil is filtered and recirculated back into the system.