[onewhippedpuppy]

Originally Posted by Zeke

Many have plastic gears.
AI blurb:
Models with All-Metal Gears (Best for Doughs/Heavy Loads):
Pro Line & Commercial Series: Known for all-steel gear systems for serious baking.
Bowl-Lift Models (Pro 600, 5 Plus, etc.): Generally feature all-metal gears for strength, though some older ones might have had plastic housing.
Newer Models (2023+): Many recent bowl-lift and Pro Line updates feature fully integrated metal gearboxes.
Models with Mixed Gears (Metal & Plastic/Nylon):
Artisan & Classic Series (Tilt-Head): Typically use metal gears for most functions but incorporate a plastic (nylon/Kevlar) worm gear as a safety fuse, designed to break under extreme strain to save the motor.

We have one that is at least 40 years old (lift bowl, and it is a PITA). We have the old Cuisinart too. Hard to find parts for but it does yeoman's duty.

This is exactly why I bought my wife a bowl lift. Her tilting one stripped out the gears because she does a lot of heavy stuff like home made bread and big batches of cookies. Everything we read was that the bowl lift was much more heavy duty.