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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Machinist Mondays with Defiance
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<blockquote data-quote="DefianceMachine" data-source="post: 2594707" data-attributes="member: 117946"><p>[h2]<strong>Precision is everything.</strong>[/h2]<p></p><p>[ATTACH=full]385956[/ATTACH]</p><p></p><p>The receiver is the heart of the rifle, and the hole going through the center, the feature that all others are based upon. The bore of the receiver is critical, as the diameter and straightness affect accuracy. Just as important is that the barrel threads in the receiver are concentric, and the receiver face and locking lug abutments are perpendicular to the bore. For this reason, we machine all these features in one operation.</p><p>When done properly, a barrel that gets screwed into the receiver will align perfectly with the two bores, concentric to each other, and under no stress from a receiver face that is out of square. This is the start of a superbly accurate rifle.</p><p></p><p>[ATTACH=full]385957[/ATTACH]</p><p></p><p>Drilling a precise hole through nearly 10" of hardened steel is not a simple task. We start by purchasing high precision lathes and having them equipped with high pressure oil coolant pumps. A common twist drill does not generally drill a hole that is straight, round, or a precise diameter. Gun drills do. After we drill and bore a pilot, the gun drill creates a precise hole straight through the receiver blank. We could leave well enough alone, but because the tool will wear, part number one and part twenty would be different.</p><p></p><p>[ATTACH=full]385958[/ATTACH]</p><p></p><p>Therefore, we gun drill slightly undersized and hone the receiver blanks to the finish diameter. The honing machine spins a mandrel with abrasive stones in the bore while moving it forward and back. The result is a smooth, round hole with a consistent diameter that is measured to .0001" resolution. That's 1/30th the thickness of a human hair for the non-machinist types out there.</p><p></p><p>[ATTACH=full]385959[/ATTACH]</p></blockquote><p></p>
[QUOTE="DefianceMachine, post: 2594707, member: 117946"] [H2][B]Precision is everything.[/B][/H2] [ATTACH type="full"]385956[/ATTACH] The receiver is the heart of the rifle, and the hole going through the center, the feature that all others are based upon. The bore of the receiver is critical, as the diameter and straightness affect accuracy. Just as important is that the barrel threads in the receiver are concentric, and the receiver face and locking lug abutments are perpendicular to the bore. For this reason, we machine all these features in one operation. When done properly, a barrel that gets screwed into the receiver will align perfectly with the two bores, concentric to each other, and under no stress from a receiver face that is out of square. This is the start of a superbly accurate rifle. [ATTACH type="full"]385957[/ATTACH] Drilling a precise hole through nearly 10" of hardened steel is not a simple task. We start by purchasing high precision lathes and having them equipped with high pressure oil coolant pumps. A common twist drill does not generally drill a hole that is straight, round, or a precise diameter. Gun drills do. After we drill and bore a pilot, the gun drill creates a precise hole straight through the receiver blank. We could leave well enough alone, but because the tool will wear, part number one and part twenty would be different. [ATTACH type="full"]385958[/ATTACH] Therefore, we gun drill slightly undersized and hone the receiver blanks to the finish diameter. The honing machine spins a mandrel with abrasive stones in the bore while moving it forward and back. The result is a smooth, round hole with a consistent diameter that is measured to .0001" resolution. That's 1/30th the thickness of a human hair for the non-machinist types out there. [ATTACH type="full"]385959[/ATTACH] [/QUOTE]
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Machinist Mondays with Defiance
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