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Firearms Identification > Machining (Exam 3) > Flashcards

Machining (Exam 3) Flashcards

1
Q

The process used to create a specific mark will affect the…

A

Uniqueness

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2
Q

How does lapping affect the uniqueness of marks?

A

It polishes out rough spots such that there are less individual marks overall

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3
Q

Define deep-drilling.

A

Creating a hole for the barrel’s bore

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4
Q

Define lapping.

A

Polishing prior to rifling in high-end barrels only

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5
Q

Define crowning.

A

Way to protect muzzle edges of the rifling from damage

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6
Q

Define chambering and throating.

A

Process used to create the chamber and taper the intersection of the chamber and the rifling

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7
Q

Define rifling.

A

Spiral grooves cut into the firearm’s bore

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8
Q

How do drilling & reaming affect the bore & chamber?

A

They leave spinning marks perpendicular to bullet trajectory or cartridge leaving the case

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9
Q

Is there a subclass to drilling & reaming?

A

No

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10
Q

What is cut rifling?

A

Cutting away material from the grooves

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11
Q

What is single-point cut rifling?

A

Rifling that cuts one groove at a time

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12
Q

What is broach cut rifling?

A

Rifling that cuts all grooves at the same time

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13
Q

Broaching between consecutive barrels creates…

A

Subclass

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14
Q

Are the marks created by broaching parallel or perpendicular to the rifling?

A

Parallel

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15
Q

How does button rifling work (HINT: think like it’s a button)?

A

Pushes the grooves down (no metal removed)

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16
Q

How does electrochemical rifling work?

A

Wet-etching the interior of the barrel under an electric current

17
Q

How does hammer-forged rifling work?

A

Hammering the barrel around a mandrel

18
Q

Does hammer-forged rifling leave individual marks?

A

No, not really

19
Q

Does button rifling leave individual marks?

A

No, not really

20
Q

Does electrochemical rifling leave individual marks?

A

No, minimal marks

21
Q

How does electron discharge machine rifling work?

A

Electrical sparks melt away drilling & reaming marks from grooves but not lands

22
Q

Nominal caliber measures…

A

Bore size (land to land)

23
Q

Define twist rate.

A

Length of barrel required to complete a full rotation

24
Q

What is the difference between conventional and polygonal rifling?

A

Conventional rifling is more rectangular while polygonal rifling has more hill & valley shapes

25
Q

How do you determine twist direction?

A

Seeing which direction the spiral is coming from and going toward

26
Q

Will a Glock have polygonal or conventional rifling?

A

Polygonal

27
Q

Individual characteristics are unique to a specific firearm and are created by imperfections that do not… (HINT: rifling direction)

A

Run in the same direction as the rifling

28
Q

Considering that shotgun barrels are smooth, do they leave markings on projectiles?

A

No

Firearms Identification (19 decks)

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