1270 Agricola Drive, Saginaw, Michigan 48604 USA 989.752.3077 | Toll Free: 877.308.3077sales@universaldevlieg.com

1270 Agricola Drive, Saginaw, Michigan 48604 USA

Ph: 989.752.3077 | Toll Free:877.308.3077


Universal Engineering / Devlieg Microbore

Universal/Devlieg Inc.

The Difference Between Finish and Rough Boring

Finish boring work within an existing hole to produce a tight hole tolerance, proper positioning, and a high-quality surface finish. It can be an exacting operation where one inaccurate hole can ruin the part. To avoid this result, the drilled hole needs to be prepped by the rough boring process before finish boring takes place. Rough boring removes and prepares the hole for finishing using pre-machining, casting, or forging. The material stock also is a factor whether rough finishing will be needed. Depending on the stock allowance, the use of a rough boring tool could be recommended to avoid multiple finish passes with the finish boring tool.

While the casting process is widely used in manufacturing, it is not always capable of achieving tight geometric tolerances. For this reason, rough boring is necessary to correct any issues before a finish boring tool can be used.

A drill that is too slender, fed too hard or has a damaged tip, is a common cause of crooked holes in the process of rough finishing. Even though this hole might appear straight, precise measuring equipment will reveal that finish boring is required to meet tolerances.

Finally, the surface finish may call for a finish bore tool. Rough boring produces an adequate finish. However, a fine boring head should be used to produce a more precise and smoother surface.

Universal DeVlieg provides innovative and cost-cutting tool holding and high precision boring solutions to the machine tool industry, servicing a diversified customer base. The combination of over 32,000 active part numbers, over 10,000 standard items, and our technical support staff deliver design engineering expertise that is unmatched in the industry. To learn more about Universal DeVlieg, contact us This email address is being protected from spambots. You need JavaScript enabled to view it. or 877.308.3077 or visit at universaldevlieg.com.