Feature Article

For drilling standard holes in metal, there are three primary types of drills: twist, spade and indexable insert. This article discusses the pros and cons of each design and the applications for which each might be appropriate. Factors considered include hole depth, tool cost, drill speed, coolant delivery, tool inventory required, machine tool requirements and expected tool life.

When hole depths exceed four times the drill diameter, problems with cooling and chip evacuation can arise. This article discusses these problems and the drill geometries, machining parameters and coolant options that can minimize them. Charts are included giving speeds and feeds for various workpieces and drill diameters.

In 1995, the Big Three automakers dropped their individual quality programs and requirements for suppliers and adopted a common program based on ISO 9000. This article discusses how the automakers' standard, called QS-9000, was developed and how they plan to implement and enforce it. Some advice for suppliers planning to earn QS-9000 registration is also given.