What is the first step before chamfering holes in the assembly?

Before chamfering holes in an assembly, the first step is to remove the layout tape. This is essential because layout tape is often used to mark the locations and sizes of holes prior to machining or assembly. If the tape is not removed, it can interfere with the tooling and measurement processes, leading to inaccuracies in the chamfering operation.

This step ensures that the surface is free of any obstructions that might affect the quality of the chamfer. Removing the tape also helps prevent any potential contamination of the workpiece and ensures that the machining can be done directly on the surface, allowing for a clean and precise chamfer finish.

Take into consideration that measuring the diameter of the holes, checking the drill bit for damage, and attaching the drill motor are important steps in the overall process of machining and assembly, but none of them should occur before ensuring the area is properly prepared by removing any layout tape.