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Leslie Banduch
LMT Onsrud LP
1081 S. Northpoint Blvd.
Waukegan, IL 60085


For Immediate Release



Ball Nose Tool Provides High Surface Finishes in Plastics


Typically, when a ball nose tool is used to machine contours in plastic, the surface finish is a slightly irregular with evident tool marks. While this finish is acceptable in most applications, it is not acceptable in many medical components, such as a knee replacement part. A knee replacement includes an insert made of mechanical plastic material. The plastic insert ensures smooth rotation between the metal components of the implant.


The mechanical plastic insert requires a very low Ra (roughness measurement), which visually is a highly polished finish. Metal machined components can achieve a high polish using abrasives in a secondary operation. Abrasives cannot be used on plastic as the abrasives will roughen the surface of the plastic.


To achieve the surface finish required for the plastic insert, LMT Onsrud, Waukegan, Illinois, developed an innovative solid carbide ball nose tool. The new tool's unique geometry, specially designed point, and highly polished primary clearance and flute give the tool the ability to attain a surface finish of 28 Ra in mechanical plastic. A 28 Ra surface finish is more than satisfactory for the knee insert.


Other industries that will benefit from the new ball nose tool include food processing and electronics. In any plastic application where the surface finish is critical, companies will want to take advantage of Onsrud's new ball nose tool.



For further information contact LMT Onsrud LP, 847-362-1560, www.onsrud.com.








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