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Rifles, Reloading, Optics, Equipment
Gunsmithing
Dividing Head
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<blockquote data-quote="Vanden Berg" data-source="post: 2867305" data-attributes="member: 27183"><p>I use an indexing head to (straight)flute barrels. This fixture is what my shop uses to spiral flute bolts. </p><p></p><p>I designed and built it about twenty-five years ago. It is driven by a rack gear, with a follower/roller that transmits X-Axis travel(via cam plate) of the table to rotational travel of the "head". Bolt handle end is supported with a dead center in a bolt(1/2-13, with a centerdrill cut to make it concentric with the bolt body . . .factory internal threads generally run out horribly).</p><p></p><p>After each cut(done in three passes), the follower/roller is taken out and the rack-gear-to-driving-gear relationship is reset. With a 24 tooth drive gear, the bolts can be fluted with any number of flutes that will equally divide 24. Most customers want six.</p><p></p><p>The rate of twist can also be changed with differing angle cam plates(bolted to the saddle). </p><p></p><p>This was one of those "cocktail napkin" designs that worked out very well(hundreds of bolts fluted over the years).</p><p></p><p>Regards, E</p></blockquote><p></p>
[QUOTE="Vanden Berg, post: 2867305, member: 27183"] I use an indexing head to (straight)flute barrels. This fixture is what my shop uses to spiral flute bolts. I designed and built it about twenty-five years ago. It is driven by a rack gear, with a follower/roller that transmits X-Axis travel(via cam plate) of the table to rotational travel of the "head". Bolt handle end is supported with a dead center in a bolt(1/2-13, with a centerdrill cut to make it concentric with the bolt body . . .factory internal threads generally run out horribly). After each cut(done in three passes), the follower/roller is taken out and the rack-gear-to-driving-gear relationship is reset. With a 24 tooth drive gear, the bolts can be fluted with any number of flutes that will equally divide 24. Most customers want six. The rate of twist can also be changed with differing angle cam plates(bolted to the saddle). This was one of those "cocktail napkin" designs that worked out very well(hundreds of bolts fluted over the years). Regards, E [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Dividing Head
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