Dec 2, 2018 · Undercut occurs when the number of teeth of a gear is too small. An undercut leads to a weakening of the strength of the tooth! The animation below shows schematically the manufacturing process of three gears with different numbers of teeth by hobbing.

Feb 15, 2021 · When cutting a spur pinion like the gear shown in Figure 1, undercutting occurs if you cut deeper than the interfering point, I. Undercutting is a phenomenon that occurs when some part of tooth dedendum is unexpectedly cut by the edge of the generating tool.

The undercut of gears is also called deeper cutting and indicates the phenomenon of cutting the root of the gear deeper than the involute tooth curve. This can happen when there is interference between a tooth cutting tool and a gear or between the two meshing gears.

Dec 2, 2024 · The undercut in gear design is a small but crucial feature that plays a vital role in ensuring the smooth operation and longevity of gear systems. Whether used in industrial robots , automotive drivetrains , or other complex machinery, the undercut helps prevent interference, reduce wear, and improve the efficiency of power transmission.

Oct 31, 2018 · The animation below shows the profile shift of a gear with 6 teeth to avoid an undercut. In this case, the thickness of the tip tooth even decreases so much that the involutes taper before the shifted tip diameter is reached.

Undercut occurs when tool tip corner does not cut the transition point between the root fillet and the involute profile. Undercut which increases stress concentration. Undercut is generally to be avoided or reduced if possible.

Oct 31, 2018 · Note: As the above animation shows, if the number of teeth is too low, the teeth are “undercut” during the manufacturing process and thus weakened. Such an undercut – and how it can be avoided even with a small number of teeth – is described in more detail in the article Profile shift. Gears can be produced not only by hobbing but also by shaping.

However, it does not mean the gear with undercut is useless. Generally, the practical minimum number of teeth is 14. To prevent undercut, you can use “shift” (changing distance between the gear cutting tool and the gear).

Jun 25, 2003 · If you try and generate a standard gear with too few teeth (seventeen or less) you will get "undercut" or "cutter interference", and the trochoid will not blend properly with the involute.

Sep 13, 2023 · It turns out that gears with fewer than 17 teeth often experience a phenomenon called undercutting, which weakens their structure and performance. This article dives into the intricacies of gear tooth design, explaining why 17 teeth is a critical threshold for maintaining gear strength and functionality.