Best Practices for the Boring Process
The boring process takes place after other hole making operations, such as drilling or reaming, make the initial hole. Using the existing pre-drilled hole, boring produces more accurate size holes to meet the specific tolerance specifications. Because of the exacting requirements of the boring process, operators should adhere to the following best practices.
Use Heads for Tight Tolerances
In the boring application, the hole size range is set by the boring head. To adjust the hole size, you change the boring head size. When boring to make larger holes with especially tight tolerances, it is best to utilize boring heads on a milling machine. This approach allows you to bore more complicated and precise holes on a mill than you can on a lathe.
Bars Provide More Options
Boring bars can create any size hole if the bar fits in the hole, making it a more flexible option than boring heads because you can achieve different size bores with the same bar. Keep in mind that deeper holes require a longer bore, therefore the length of the boring bit is critical.
Proper Boring Tools Minimize Chatter
While chatter, or a vibration, is common during the boring processes, boring bars and heads made from heavier materials can suppress it. Minimizing chatter gives you better productivity and surface finishes.
Use Boring to Fit the Application
It is essential for the operator to understand which process to use when creating a hole in a part. For example, Drilling is used to make an initial hole. Reaming is used to smooth the walls of an existing hole. Boring enlarges the hole to precise dimensions. However, there are rough and finish boring processes. Rough boring focuses on metal removal to prepare the hole for finishing. Finish boring achieves tight hole tolerances and correct positioning with a high-quality surface finish to complete the operation on an existing hole.