Machining

Creep-feed grinding is not as popular a process as it was predicted to become in the late 1980s. But a machine shop that specializes in CF grinding has found great success by using the process. The shop's owner and other CF-grinding experts contend that as workpiece tolerances become tighter and manufacturers begin using more exotic workpiece materials, CF grinding will grow in popularity.

A detailed description of a combination drill that machines six different nhole diameters. Used on a dedicated drilling machine that drills cast iron ncylinder heads, it was developed over a number of years.

Dry milling and turning grow in popularity day by day, but dry drilling is nanother matter. Because of the nature of drilling, it's more difficult to nperform this operation without coolant.

The CNCs on many lathes don't have drill-pecking cycles.

Author describes what he's learned about turning hardened steel. Discussed are the machine tools needed as well as PCBN and ceramic inserts.

Three companies that tap millions of holes annually offer advice for improving the tapping of steel and aluminum. Discussed is coolant application, equipment for tapping and determining speeds. There's also a sidebar on thread milling.

When facemilling with an indexable-insert tool, the axial and radial rake angles of the inserts can have a significant impact on performance. This article reviews the basics of rake angles and their effect on tool life, cutter effectiveness and metal-removal rates.

Advanced tool grinding machines are making it possible for even small shops to regrind complicated tool geometries in-house. This article explores the cost and time factors that must be considered before a shop decides whether it will regrind tools in-house or outsource the work.

The manufacturer of the most widely used fire-hose nozzle has continually upgraded its processes and equipment to meet its customers' needs. This article outlines the market forces and changes to its nozzle design that have driven the company to maintain a state-of-the-art shop.

A project engineer recounts his experiences planning for, installing and setting up a new CNC vertical milling center. Among the issues he explores are the questions that must be answered before the machine arrives, selecting or designing tools and fixtures for the new machine and preparing workers for the change.

Industry professionals explain why manual machining skills are still necessary even in this age of CNCs. The article also describes the additional skills needed to program and operate computerized machine tools.

This article relates how three shops used creative ideas to solve difficult boring problems. One shop built a custom tool to bore deep holes. Another used a combination of standard tools to bore an interrupted cut. And a third achieved tight tolerances with an assortment of plastic sleeves and plugs.