Our Antonie Van Leeuwenhoek Single Lens Microscope Reproduction on Sale at eBay:

Made with tools and methods Leeuwenhoek might have used in the seventeenth century. The threads were swaged, not cut, with screw plates we made in our shop. The lens was shaped and polished with crude home made laps and abrasives. The silver was bought by my silversmith Grampa over a hundred years ago. Each part was made to fit one at a time, and constantly with the purpose in mind of building a useful, working microscope.

https://www.ebay.com/itm/332739492488?           Sold!

A Double Knurl Nut:

An owner of a Brashear telescope needed a nut with a double, straight, convex knurl with a particular pitch and diameter. He provided a photograph of an original knurled screw:

Here is the partially finished nut :

And on display at NEAF 2018:

A Brass Gear for an Orrery:

Orrery gears need unusual tooth counts and diameters to give the planet motions the best approximations. They are not available off the shelf, and so must be custom made. This gear has a Gothic Arch shaped cycloidal tooth form familiar from traditional clockworks. The machining process creates the epicycloidal curve by coordinating several motions. The tool not only follows this curve, but also remains tangent to it, resulting in a very smooth surface. The bore and the teeth are cut in one setup, providing nearly perfect concentricity. These teeth run together perfectly.

A John Brashear Refractor Missing a Screw:

The tailpiece clamping screw was lost:

Here is an example screw from another Brashear:

The screw part on the lathe; single point threading and knurling done, parting-off in progress:

Finished! The knurls were cut rather than swaged, so they could be matched exactly to the example:

The proud owner, Bart Fried, pointing to the shiny screw:

Pillars for an Orrery:

We made a follower rest and tried it out making pillars for a clockwork frame for an orrery.

A Dovetail Case for an Alvan Clark & Sons Lens:

Custom made black walnut case for the 8″ Gustavus Wynne Cook telescope lens. Made from lumber that has been with our family for a hundred years. The dovetails were cut by hand. Our family learned to carve from our Great Uncle Thorsten Sigstedt. He was a professional Swedish wood carver:

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