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Manufacturing News

Prolonging Tool Life of Deep Hole Drills by Using the Appropriate Pilot/Starter Drill

12/14/2016

8 Comments

 
Guest Blog by Cory Cetkovic, Product Manager, Sphinx, Big Kaiser
Selecting the appropriate pilot drill is critical to maximize performance and tool life of a succeeding deep hole or micro drill. The purpose of a pilot drill is to create a clean, consistent working surface for the succeeding drill to enter the workpiece.

Important aspects such as diameter tolerance and point angle (Figure 1) are often overlooked leading to inconsistent, unacceptable results.

A pilot drill diameter should be slightly larger than nominal diameter, whereas the succeeding drill diameter should be smaller. This is often accomplished using positive and negative tolerances respectively (Figure 2). Selecting the incorrect pilot drill diameter can lead to premature failure of the succeeding drill as it will enter the pilot hole using its margins rather than its center-cutting point.
​
It is also important for a pilot drill’s point angle to be equal to or larger than that of a succeeding drill. The purpose of a larger point angle is to guide the succeeding drill to centerline while preventing its corners from colliding with the point angle left by the pilot drill. Using a pilot drill with a smaller point angle usually results in chipped corners on the more expensive deep hole drill after drilling 10-20% of the expected tool life.
Pilot Hole drilling
Figure 1. Three examples of a subsequent drill entering different pilot holes. The preferred situation with a pilot hole that has a larger diameter and point angle is identified with a green check mark.
Pilot Hold drill micordrill
Figure 2. Demonstrates one method of achieving the appropriate pilot hole diameter. The pilot drill and succeeding drill have equivalent nominal diameters, but tolerances prevent the pilot hole from being smaller than the deep hole drill diameter.
8 Comments
Vivian Black link
10/9/2019 08:57:48 pm

I never thought about how choosing the correct diameter drill affects the amount of durability of a wrong diameter drill. My well needs drilled and my landlord has informed me that my source of groundwater is pretty deep underground. These tips made me realize I should hire a professional to do this precision deep hole drilling.

Reply
Omaha Well Drilling & Treatment Services link
2/14/2022 02:29:21 am

These are great tips, It is also important for a pilot drill’s point angle to be equal to or larger than that of a succeeding drill. Thanks!

Reply
Milwaukee Water Well Drilling link
2/17/2022 10:34:25 pm

Using a pilot drill with a smaller point angle results in chipped corners on the more expensive deep hole drill after drilling 10-20% of the expected tool life. Great!

Reply
Diana Alonzo link
3/1/2022 01:24:32 am

These suggestions convinced me that I should hire a professional to perform this precision deep hole drilling.

Reply
Tools Detail link
11/8/2022 09:35:54 am

This is a great article! I'm glad I found it while searching for similar content because the information is not only helpful, but it's also practical with the included images. After reading it, I learned many things I can apply to my project. Keep up the excellent work!

Reply
Justin Hudson link
11/9/2022 04:56:58 am

Child training task relate prove. Decade security improve add none test big study.
Free author issue ground while run turn. Evidence special however vote staff security performance.

Reply
Coyotetools link
12/2/2022 04:52:36 am

Thanks for sharing such a great information. Its really helpful. I always search to read the quality content. Thanks

Reply
bore pump repair link
1/10/2023 06:05:03 am

The management of runout, which grows with cutting tool length, is one of the biggest issues in deep hole drilling. Runout will increase noticeably if, for example, a cutting tool with a 6 diameter is swapped out for one with a 30 diameter. The increased runout caused by longer tools can be mitigated by a more precise toolholding technique or machine tool.

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