General Machining & Manufacturing Processes

Former job shop finds success manufacturing custom gears with "impossible" lead times.

Debunking seven common CNC-programming myths.

A look at Swiss-style cutting tools and how they are applied.

Understanding parting-off operations

The use of compacted graphite iron is continuing to grow, particularly for automobile castings. The benefits of CG iron vs. gray cast iron are its ability to handle heat better and better machinability. The author gives an overview of the material's characteristics and discusses feed-and-speed considerations when machining CG iron.

Understanding parting-off operations.

An expert on heat treating write about the advantages and disadvantages of available approaches and systems: stainless steel foil, atmospherically controlled furnaces, pressure-quench vacuum furnaces and two-zone vacuum furnaces. There's also a sidebar on cryogenic treatment of metals.

Capability is determined by how well a process produces parts. Three measures of capability are important to a machinist: gage, machine and process. The author provides a detailed description of capability and suggests ways to quantify if a process is or isn't capable.

DNC can mean either Direct Numeric Control or Distributed Numeric Control. Either way, a DNC links a shop's computers and machine tools and saves times. A DNC eliminates manual transcription of NC data, the downtime caused by shop personnel having to make programming entries and transporting part programs between engineering and their machines.

Ninety-nine percent of indexable tools that break can be repaired, according to companies that repair tools. And, they say, a broken indexable tool can nbe repaired so it performs as well as or better than the original.

Small-diameter drills designed for drilling circuit boards can be used as a low-cost alternative for producing holes in other materials as well. Their fragility is the only drawback. This article describes these tools and the special handling they require. n

Business insurance represents a costly but necessary investment for any shop. This article presents the findings of a Cutting Tool Engineering survey of the liability insurance purchasing habits of readers. The article also offers some guidelines for insurance shopping.