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Sphere Genius!



The Holdridge Radii-Cutter will turn virtually any spherical contour on a lathe. It turns both concave and convex, in any material that can be turned, and in a wide range of sizes. The Radii-Cutter is the most versatile radius turning tool on the market. The Radii-Cutter is available in six models, the largest of which can turn a maximum diameter ball of 12 inches. Typical parts include complete balls, sockets to radius depth, pipe bending dies, tube rolling diesets, ball valves, ball bearing races, lenses, corner radii and much more. A Power Drive Unit is available for all models of the Radii-Cutter, which replaces the manual lever-handle drive with a specially designed gearmotor drive.


The Holdridge Spherical Tool is a newer addition to our line of lathe mounted radius-turning tools. The Spherical Tool mounts on standard lathe toolposts, and is also available in six different models. Featuring a smooth hand crank operation with a worm gear drive, the Spherical Tool is excellent for turning balls and sockets. The largest Spherical Tool can also turn a maximum ball of 12 inches in diameter.

Spherical Tools

About Us

Holdridge Mfg. Co. was founded in 1956 by Warren Holdridge, following his development of the Holdridge Radii-Cutter. To this day, The Holdridge Radii-Cutter is the easiest and most accurate means of turning spherical shapes on a manually operated lathe. Still family owned, Holdridge Mfg. Co. offers premium tools at affordable prices, and of the utmost quality. The combination of your lathe and our tools opens a new spectrum of parts which you will be able to fabricate.

Additonal Information
3S3D Parts List
4S4D Parts List
8D Parts List
Speherical Tool
Model 4S and 4D Information
Model 3S and 3D Information
12D Parts list
Indexable Tool

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Call us for our affordably priced premium tools.

(844) 878-4591


Thank you for your interest. For questions or comments, please use the information listed here. We look forward to hearing from you soon.

(323) 321-4937

(310) 329-3854

Hours of Operation
Monday - Friday:
8:00 a.m. - 5:00 p.m.

15224 S Figueroa Street
Gardena, CA 90248-1726

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NFIB Member