Metalworking & Woodworking for Gunsmithing Flashcards

When turning a barrel tenon on a lathe, what is the critical measurement that must be achieved for proper headspace?

Answer: Length and diameter of the tenon that controls chamber-to-bolt-face distance

The tenon length and shoulder position directly control headspace by determining how far the barrel seats into the receiver relative to the bolt face.

Which solvent is most appropriate for degreasing metal parts before bluing or Parkerizing?

Answer: Acetone, naphtha, or commercial degreaser leaving no residue

Complete degreasing using residue-free solvents is essential because any oil or grease contamination will cause bluing or Parkerizing to fail or spot.

A walnut rifle stock develops a crack along the wrist during recoil. What is the most structurally sound repair method?

Answer: Inject thin cyanoacrylate into the crack, clamp, and reinforce with a metal wrist bolt if needed

Thin CA glue penetrates the crack by capillary action, bonds the fibers, and a cross-bolt provides additional mechanical reinforcement at the wrist's high-stress point.

When using a surface grinder to true a receiver face, what grinding wheel specification is appropriate for hardened steel?

Answer: Fine aluminum oxide wheel rated for hardened steel

Fine-grit aluminum oxide wheels are standard for precision surface grinding of hardened steel receiver faces, providing controlled material removal without burning.

What is the purpose of annealing the case neck area of a cartridge case, and how does it relate to gunsmithing?

Answer: It softens work-hardened brass to restore ductility and prevent cracking

Repeated firing work-hardens brass necks; annealing restores their ductility to allow proper bullet seating and prevent neck splits, knowledge useful when advising reloading customers.

When cutting checkering, a 'runout' occurs when a line exits the pattern border. What causes this most frequently?

Answer: Cutting at an angle that diverges from the established master line direction

Runouts result from the cutter drifting off the intended line angle, most often when the craftsman's hand angle diverges from the master line established at the start of the pattern.

Which lathe operation is used to cut the crown at the muzzle end of a rifle barrel to protect rifling and ensure accuracy?

Answer: Recessing or countersinking using a tool ground to the desired crown angle

A crown is cut by recessing the muzzle face at a specific angle or radius using a properly ground cutting tool to uniformly protect all rifling lands at the exit point.