Edge-forming rollers join round assemblies.

Tubing, cylindrical housings, and similar shapes often pose joining challenges. Crimping and pressing operations have been frequently used to form an edge on such shapes as a means of joining them to another part or to enclose an assembly of parts, but those methods have their drawbacks.

Relays switching at minimal loads require clean contacts.

Selecting joining method should precede joint design.

Use of thinner sheet metal makes proper threaded fastener selection more critical.

Carbon dioxide found popularity as a refrigerant for comfort cooling in the 1920s, before being replaced by more convenient CFCs (chlorofluorocarbons) in the 1930s and then HFCs (hydroflurocarbons) in the 1990s. But with the Kyoto Protocol, an international treaty requiring industrialized nations to lower their collective greenhouse gases 5 percent below 1990 levels by 2012, carbon dioxide has come back into the limelight as a hope for a safe and effective refrigerant replacement.

Reversible adhesive offers solutions for repairs, recycling and more.

Compliant mechanisms make Design for No Assembly a reality.

Punch-and-die mechanical fastening system offers benefits.

Choosing the right motor for furnace and water heater projects.