When drilling, accuracy is paramount. While the sides of a drill bit, specifically the margin of the flute land, are designed for chip clearing and preventing binding rather than cutting, maintaining precision is crucial. This is where Drill Bit Guides, commonly known as drill bushings, become indispensable.
Understanding Drill Bushings
Drill bushings are specialized, hardened components designed to guide drill bits, ensuring accurate and repeatable hole placement. They are standard elements in tool and die making, acting as a guide for the drill bit as it enters the workpiece. Typically made from hardened steel to withstand repetitive use and minimize wear, these bushings are often press-fitted into tool plates or jigs at the desired drilling location.
enter image description hereAn image showcasing various drill bushings, essential components for precision drilling and drill bit guidance in industrial applications.
For applications with limited use, regular steel like 1018 cold-rolled steel might suffice. However, for production environments or repeated tasks, purchasing industrial-grade drill bushings is generally more economical and reliable than attempting to fabricate them. Pre-made bushings are engineered for durability and precision in demanding drilling operations.
Selecting the Correct Drill Bushing
Choosing the right drill bushing involves considering several factors, notably the internal diameter. A bushing intended for a 1/4″ drill bit, for example, might have a slightly larger internal diameter, such as 0.252″, rather than exactly 0.250″. This slight clearance is intentional, preventing excessive wear on the drill bit margin. Purchased bushings are designed with these clearances in mind, eliminating guesswork and ensuring optimal performance and longevity of your drill bits.
When using drill bushings, other factors such as chip evacuation become important. Resources like the Carr Lane catalog offer extensive discussions and guidelines on these considerations, providing in-depth knowledge for effective and efficient drilling processes. Exploring these resources, readily available through online searches, will further enhance your understanding and application of drill bushings in precision drilling.
