chamfer tools

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Last Post 17 November 2025
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CBA Member

Ross Smith posted this 15 November 2025

What is the purpose of the center stud on outside chamfer tools? As is the rcbs case mouth tool.

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Standard Member

TRKakaCatWhisperer posted this 15 November 2025

it sometimes helps keeping the tool centered on the case.

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CBA Member

pat i posted this 15 November 2025

I can't see a reason for it being there at all to be honest. I just measured the stud on my RCBS chamfering tool and it was around .157 so don't see it centering too much. My Forster doesn't have the center stud and works the same as the other ones plus I can use it to bevel the bases of my plain base bullets.

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CBA Member

Bud Hyett posted this 16 November 2025

When set in a drill press for mass production, the pin helps you guide the case in.

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CBA Member

Boschloper posted this 16 November 2025

I pulled the pin out of mine.

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Ken Campbell Iowa posted this 16 November 2025

plus you could squeeze a fitted guide bushing on that center pin if you wanted to take that tool up a notch ...

more even chamfering ... although i doubt it would show up on the targets ...

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CBA Member

pat i posted this 16 November 2025

Thanks for starting this thread Ross. I guess you got the answer as to why some chamfering tools have the stud. Gives people something to talk about on a Saturday night when nothing's good on the tube.

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Aaron posted this 16 November 2025

It is there to mediate the alignment deviation spannus for the centering datum of the spanaptic spatial coordinate relative to the axial position of the tool when used freehand by the user instead of the linear position in a bench mounted press. Plus it provides the user with a visual proboscis to poke into a hole.

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