08-16-2014, 10:36 PM
Nice work on the photographic parts, a subject near and dear to my heart. What material did you use and do you have a way of getting it to a flat black color? Shiny bits inside a camera can easily cause flare in the image (loss of contrast) at the least, and at worst a ghost image of the ring.
If I was threading that I wouldn't hesitate to make it from a single piece and finally get some use out of my drop-head threading insert holders. These are holders that can be used upside down and thread from left to right to avoid crashing into the shoulder. For a 0.5mm thread you would need a thread relief groove of no more than 0.3mm width at the shoulder to start the tool.
If I was threading that I wouldn't hesitate to make it from a single piece and finally get some use out of my drop-head threading insert holders. These are holders that can be used upside down and thread from left to right to avoid crashing into the shoulder. For a 0.5mm thread you would need a thread relief groove of no more than 0.3mm width at the shoulder to start the tool.