# Power Engineering \& Manufacturing: Custom design and manufacturing of heavy\-duty gearboxes

> PEM provides custom\-engineered gearbox manufacturing and rebuilds for heavy\-duty industrial applications, delivering performance, durability, and uptime\.

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## Pages
- [Ball \& Ramp Slip Clutch Paper](https://www.pemltd.com/technical-articles/ball-ramp-slip-clutch-paper/)
- [Determining the Static and  Dynamic Coefficient of Friction  and Its Causes for Variation](https://www.pemltd.com/technical-articles/coefficients-of-friction/)
- [Crawler Transaxle with Differential Lock and Variable Steering](https://www.pemltd.com/technical-articles/crawler-transaxle/)
- [Introduction to Gear Design](https://www.pemltd.com/technical-articles/introduction-to-gear-design/)
- [Spur and Helical Gear Design](https://www.pemltd.com/technical-articles/spur-and-helical-gear-design/)

## Projects
- [PEM Gearboxes Power Gateway Arch Tram System \(St\. Louis, MO\)](https://www.pemltd.com/project/gateway-arch/)
- [Big Bend Dam](https://www.pemltd.com/project/big-bend-dam/)
- [AD\-43 Gearboxes for U\.S\. Navy](https://www.pemltd.com/project/ad-43-gearboxes-for-u-s-navy/)

## News Posts
- [Power Engineering \& Manufacturing Ltd Partners with Serco NA and DARPA on Revolutionary Uncrewed Surface Vessel 'USX\-1 Defiant'"](https://www.pemltd.com/news-post/serco-darpa-partnership-usx-1-defiant-uncrewed-vessel/)
- [Custom Designed Gearbox for the Pump Industry](https://www.pemltd.com/news-post/custom-designed-gearbox-pump-industry/)
- [PEM Chosen for Employers of Choice 2025](https://www.pemltd.com/news-post/pem-employers-of-choice-2025/)
- [Update on the USX\-1 Defiant and PEM's Involvement](https://www.pemltd.com/news-post/update-on-the-usx-1-defiant-and-pems-involvement/)
- [PEM Awarded Prototype Gearbox for DARPA’s “No Manning Required Ship” \(NOMARS\) Project](https://www.pemltd.com/news-post/pem-awarded-prototype-gearbox-for-darpas-no-manning-required-ship-nomars-project/)

## Optional
- [Sitemap index](https://www.pemltd.com/sitemap_index.xml)