Cobalt spot drills are drill bits used to create a precise starting point for a subsequent drilling operation. Here are some key features and benefits:
- Material: Made from cobalt alloyed steel, which is extremely strong and more durable than high speed steel (HSS).
- Purpose: They are designed to ensure the hole is accurately located by creating a small "spot" on the work piece. This helps guide the main drill and prevents it from wandering.
- Design: These drills typically have short flute lengths, providing stability and minimizing deflection during the initial stages of hole preparation. They have different point angles which should be slightly larger than the main drill point angle.
- Applications: Ideal for pre-centering operations, chamfering, and protecting the cutting edges of subsequent drills.
Cobalt spot drills are essential for achieving superior hole quality and positioning accuracy in various drilling tasks.
