Motor Cover Handle

In this video we make an accurate reproduction motor cover handle for the Kearney and Trecker horizontal mill. My 2HL was missing one of the handles so I measured it up and here we are. I use an interesting technique to generate the spherical part of the handle. It is the exact same process that was used to machine the impressive bearing in the thumbnail image. That picture is the 167 ton spherical bearing for the 140 foot diameter Green Bank telescope in West Virginia. The process uses two intersecting rotations identical to the process of spherical lens manufacturing to geometrically generate a spherical surface. The process can be used for external or internal features. If you are interested in trying the technique yourself or want additional technical information there is a section in my book going over the process in detail, Metalworking Doing it better. https://www.amazon.com/Metalworking-D...