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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair NT-4000 Neck Turning?
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<blockquote data-quote="jeffwhip" data-source="post: 537581" data-attributes="member: 22355"><p>Ok,</p><p></p><p>Here is my exact measurements. I'm measuring my cases with a nice Sinclair/Starrett ball micrometer.</p><p></p><p> .311 = 280 AI Chamber</p><p> <u>- .284 </u> (Bullet diameter)</p><p> .026</p><p><u>divided by 2</u></p><p> .013 neck thinkness (maximum)</p><p></p><p>When I measure the thickness of the neck wall with my Sinclair/Starrett ball micrometer, most of the cases measure anywhere from .0125 - .0130 (before cutting) up to the base of the neck. There are some cases however, that measure .0120 in places. So I set my cutter to cut .0125. This leaves me with a couple of problems:</p><p></p><p>1. The cases that are only .0120 on one side are not being cut at all so now I have some cases that are .0120 on one side and .0125 on the other.</p><p></p><p>2. Even though I have the 40 deg carbide cutter to match the 40 deg shoulder on my 280 AI case, when I cut so that there is a slight cut up into the shoulder (as depicted in the Sinclair manual), I am left with a case that measures .0130 right up against the shoulder and .0125 throughout the rest of the neck.</p><p></p><p>It almost seems as though the 40 deg cutter is not even and is off by .0005" on the angled end against the shoulder. I don't dare go into the shoulder any more. So:</p><p></p><p>1. Has anyone seen this before?</p><p>2. Should I call Sinclair and have them send me another 40 deg cutter?</p><p>3. Should I cull out all the brass that measure less than .0125 or does this really matter?</p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="jeffwhip, post: 537581, member: 22355"] Ok, Here is my exact measurements. I'm measuring my cases with a nice Sinclair/Starrett ball micrometer. .311 = 280 AI Chamber [U]- .284 [/U] (Bullet diameter) .026 [U]divided by 2[/U] .013 neck thinkness (maximum) When I measure the thickness of the neck wall with my Sinclair/Starrett ball micrometer, most of the cases measure anywhere from .0125 - .0130 (before cutting) up to the base of the neck. There are some cases however, that measure .0120 in places. So I set my cutter to cut .0125. This leaves me with a couple of problems: 1. The cases that are only .0120 on one side are not being cut at all so now I have some cases that are .0120 on one side and .0125 on the other. 2. Even though I have the 40 deg carbide cutter to match the 40 deg shoulder on my 280 AI case, when I cut so that there is a slight cut up into the shoulder (as depicted in the Sinclair manual), I am left with a case that measures .0130 right up against the shoulder and .0125 throughout the rest of the neck. It almost seems as though the 40 deg cutter is not even and is off by .0005" on the angled end against the shoulder. I don't dare go into the shoulder any more. So: 1. Has anyone seen this before? 2. Should I call Sinclair and have them send me another 40 deg cutter? 3. Should I cull out all the brass that measure less than .0125 or does this really matter? Thanks [/QUOTE]
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Sinclair NT-4000 Neck Turning?
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