In this short video, OSG offers tips to ensure safe, consistent operation in a long drilling application.

In this short video, OSG offers tips to ensure safe, consistent operation in a long drilling application.

Video Transcript

Welcome to OSG's 60-second troubleshooting video. Deep hole drilling is a common application in many industries with lengths of 10, 20 or 30 times the diameter or longer. The length of the drill means it requires a special process to ensure effective operation of which the most well known is drilling a pilot hole first. Usually these pilot holes are two to five times the diameter deep and use a drill with identical or larger point angle than the long drill to ensure stability and engagement at the tip.

The second step in this process, following piloting, is to insert the long drill to near the pre-drilled depth while rotating at a low speed below 500 rpm. This prevents instability from rotation at drilling speed, stopping the drill from chattering as it enters. After low rpm insertion, increase the speed to the drilling rpm and begin the drilling cycle.

Once drilling has finished, the final step is retracting the drill following the same procedure as inserting. retract to the pilot hole depth at drilling speed then decrease to below 500 rpm for exit from the hole. Following the steps outlined in this video will help to ensure safe, consistent operation in a long drilling application. Thank you for watching. For more information visit

Previously Featured on OSG's YouTube channel.

Shop for extra length drills from OSG.

Talk to Us!

Interested in the gun drill method. Than You Jason Brown


Leave a reply

Your email address will not be published. Required fields are marked *

OSG is a leading manufacturer of taps, end mills, drills, and indexable cutting tools. OSG’s extensive line of high technology cutting tools features exclusive metallurgy, cutting geometries and proprietary surface treatments to help increase productivity, reliability and tool life.

OSG is determined to achieve continuous growth by contributing to the advancement of manufacturing industries worldwide. Gaining the support and trust of our customers has always been the commitment of OSG.

As a comprehensive cutting tool provider with operations spanning across the globe, OSG is committed to contributing to the advancement of the manufacturing industries by shaping our customers’ dreams into reality.

Browse Products from OSG

More on Machining

The two keys to proper toolholding – and machining results – are correct setup and standardized routine cleanliness.

Calculating the true cost of cut-off wheels in various applications goes well beyond the purchase price. 

The strength and stiffness that make titanium ideal for aviation equipment and human joint replacements also make it tough for machinists to cut and shape. Here’s what you need to know to work successfully with this widely used metal.


Signing into Better MRO is easy. Use your username / password, or register to create an account. We’ll bring you back here as soon as you’re done.

Redirecting you in 5 seconds