Chamfering internal serrations on a hollow threaded part

Nov 09, 2026 Last reply: 2 hours ago 2 Replies
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Anyone who has faced a batch of parts with saw-tooth serrations hidden inside a hollow bore knows the misery of chasing those burrs by hand. The maker of this job decided there had to be a better route and programmed the whole chamfering operation to run on a five-axis machining centre instead. The part in question is a cylindrical metal component with angled internal flutes, external screw threading on one end, and longitudinal cutout openings along the body.



The setup is worth a close look. The workpiece sits horizontally between a rotary chuck and a tailstock, and an angled milling spindle head lowers a slender cutting tool through the top opening to reach the serrated interior. Before any cutting, the spindle holds a wireless touch probe with a spherical stylus ball, tilts over at an angle to slip the probe through one of the hollow windows, and measures coordinates along the interior sidewall before retracting upward. Running that probing pass first seems like a sensible way to nail down where the features actually are.



Getting the programming side sorted was apparently its own battle. The maker considered CAMplete before buying Esprit, but CAMplete declined to support this machine, and being a two channel machine is also a problem for simulation support. The Esprit model and simulation for this machine is, in the maker's own words, pretty good, which sounds like a win after that search.



The one thing left open is the part itself: the maker has permission to share pictures but cannot discuss what it does. That mystery does not take away from the machining on display, and the stainless steel sliding panels on the enclosure frame it nicely.



Project by escapethewormhole. Watch it on their YouTube channel:

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Curious about the probing step. Does the stylus ball just take a few hits along the serrated sidewall to confirm position, or is it sweeping a longer path to map each flute before the chamfer tool comes in? Tilting the spindle to get a probe through that window is a move I would not have thought of.

From what the maker has shown, it is an automated touch-probing sequence on the workpiece: the spindle tilts at an angle to position the probe inside the hollow window, the probe measures coordinates along the part's interior sidewall, and then it retracts upward. The maker has not said how many contact points are taken or whether it sweeps a longer path, so the exact probing strategy is not something we know.

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