Thread milling

The last operation we have left to complete the part is threading the central hole with an M36x4 profile.

During the previous operation (in the Milling a hole section), we already machined the pilot hole, which has a diameter of 31.97 mm.

We should also already know the theory behind threads since we already covered a similar operation in Chapter 5; however, this time we’ll cover the process in a bit more detail and try to explain a few potential issues we didn’t mention before.

Thread geometry

In order to machine threads, we have to know them! To find all the information needed for our thread, we can discover ISO thread tables online.

When searching the web for thread tables, we have to make sure that we are looking at the right type of thread. Internal and external threads have different dimensions, and confusing one for the other will result in a wrong thread profile.

In the following table, we can find the data for an M36x4 internal...