How To: Harmonograph For Light Painting

A few posts ago I shared some light painting images that were created using a harmonograph. One of those pictures made it to explore on Flickr so I decided it would be a good idea to show people how I made the harmonograph and took the photograph. It’s somewhat ad-libbed, but I will let the video above do the talking.

Rolling A Large ACME Thread

Let’s get serious…about thread rolling. This video from Tesker Manufacturing Corporation shows a thread rolling machine that is capable of rolling threads in stock up to 12″ in diameter. The thread they roll in this video is a 4.5″ x 1 TPI single start ACME in 1045 Cold Drawn Steel. Now THAT is a serious thread.