Precision balancing air shafts that end up on the Boeing 787 is an art. The corrections are made in a milling machine using carbide end mills with very specific corner radii. The part is gripped on one end in an index head and is supported in a lathe steady rest to mill to precision requirements. These parts are extremely delicate and have fragile labyrinth seals that can be destroyed with a very light bump. The value of the shaft as you see here is over $10,000 USD.
Here at Hi-Tek Balancing, we work with quite a few different types of machines regularly. Each of our machines fulfills a slightly different purpose, enabling us to create and repair complicated machine parts for many types of equipment. This month we’d like to explain a little about our knee mills. A knee mill is a milling machine that has an x-y table that can be adjusted vertically up and down the column. They are also sometimes referred to as a knee-and-column mill. Most other types of milling machines have x-y tables that are stationary instead. As you can imagine, this gives us more flexibility in the shop. Continue reading “What is a Knee Mill?”