Precision Jig for Neck Chamfer Tool
California shooter Mark LaFevers has come up with a slick, adjustable fixture that delivers a precise, repeatable inside-neck chamfer every time. He uses a Holland Case Mouth Chamfer Tool with a 14° cutter, but this set-up works equally well with other chamferers with an extended handle. With Mark’s tool jig, the Holland Tool inserts through the top, indexing vertically off a shoulder. A small recess is cut in the center of the wood base for the case head. The tool mount can be raised or lowered with the adjusting bolts on all four corners. Simply slide a trimmed-to-length case in the middle, give the Holland Tool a few spins, and you get a perfect, identical chamfer every time. Now that’s ingenuity! Mark isn’t planning to produce these commercially, but he’s happy if someone wants to copy his jig design.
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NOTE: In the photos above, you see an older version of the tool. Hollands has improved the design of its current 14° Chamfer Tool. The cutting head now has a 3-flute design that provides a smoother, chatterless cut. The head is now made of carbide so it cuts faster and holds its cutting edge longer. This tool is available from Holland’s Shooters Supplies for $32.00 (item CMCT-CAR).
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Tags: Brass, Case Prep, Chamfer Tool, Jig
Seems like a good idea, for the cutters that have the obvious problem of not being able to control depth of cut, and keeping the tool in-line/straight with the case. The K&M tool solves both shortcomings with the pins that ride in the flutes of the cutter, keeping the cutter straight & controlling depth of cut, to exactly the recommended 1/32″. Total cost is $24.
Mark is pretty ingenious! His design works in the field too – that looks like the Cuyama range in the background.
K&M makes a tool that does this, that costs only slightly more than the Holland tool.
f d shuster:
Possibly a transposition – or old pricing – the K&M tool I believe you are referring to is $42, not $24 (http://www.kmshooting.com/catalog/case-neck-chamfer-tools/controlled-depth-tapered-reamer_large_6mm-338.html).
ELR Researcher
the K&M tool is well worth the $42.
I’d give $100 for it if that’s what K&M charged. I’ll NEVER use another chamfer tool
Agreed, super tool.
PS: You can use a Wilson case trimmer and add their vld chamfer tool to do the same thing.
Nifty DIY project in the article, don’t get me wrong.
The Giraud accomplishes this in about 1 second, while trimming and deburring at the same time.
If you don’t own one, you should.