​What is used for boring holes in rough work?

For boring holes in rough work, various tools can be used depending on the specific requirements of the machining operation. Some common tools include:

Boring Bars: Boring bars are commonly used for rough boring. These bars are typically made of hardened steel and have a cutting tool at the end. They can be inserted into a machine tool such as a lathe or a milling machine to enlarge existing holes.

Indexable Boring Tools: These tools use replaceable carbide inserts that have multiple cutting edges. Indexable tools are efficient for rough machining as the inserts can be easily replaced when they become dull or damaged.

Rough Boring Heads: Boring heads are used in milling machines and machining centers. They can have adjustable inserts or cutting edges, allowing for flexibility in the diameter of the hole being bored. Rough boring heads are designed to remove material quickly.

Modular Boring Systems: These systems consist of a combination of components, such as boring bars, adapters, and cutting inserts, assembled in a modular fashion. They provide versatility and can be configured for rough boring applications.

Carbide Boring Tools: Carbide tools are known for their hardness and durability, making them suitable for rough machining operations. They can withstand the demands of removing larger amounts of material during the rough boring process.

Trepanning Tools: Trepanning is a specialized form of boring used to create large-diameter holes. Trepanning tools are designed to cut an annular groove and remove the center material, leaving a hole. This can be an effective method for rough machining large-diameter holes.

It's important to note that the choice of tool depends on factors such as the material being machined, the desired hole diameter, the machining setup, and the overall machining strategy. Machinists often use a combination of rough boring and finishing tools to achieve the final specifications and surface finish for a particular hole.