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acme buttress square threads

What is a Lead Screw?

By Shizu Yamaguchi Introduction If you have made it here, you are likely wondering what a lead screw is. And you may have some questions about pitch, lead, starts and thread types. In this...

slew ring

How Does a Slew Ring Work?

By Shizu Yamaguchi Photo: “English: Slew ring bearing” by Dkluscious, licensed under CC BY-SA 4.0 Slew rings have a few different names, including turntable bearings, slewing rings and slewing bearings. The purpose of slewing...

DNV Approval

What is DNV Type Approval?

By Tim Schneebeck DNV is a classification society that was created in 2013 after the merger of Det Norske Veritas (Norway) and Germanischer Lloyd (Germany). The company assesses ships and offshore structures for safety and...