Showing posts with label threading. Show all posts
Showing posts with label threading. Show all posts

Wednesday, May 24, 2023

Watchmaking: First Screw Made

 Watchmaking: First Screw Made


Taking a 3mm O1 (cool hardening) steel rod and making a very tiny screw from it. Here is what will be the threaded portion still on the lathe next to the screw die plate I threaded it with.

The plate can thread screws  down to 0.7mm up to 2.0mm.





Here is the screw (red arrow) held in a pin vise; the pin vise is in a larger vise.

The thin "string" is actually a jeweler's saw that I used to cut the slot on the screw's head for use with a flat bladed screwdriver.





A container of brass shavings used to even out the heat treatment. I heat blued this screw to give it a dark blue layer that protects and looks nice.





Here is the screw on a tiny USA 10 cent dime coin.





"I'm tiny too!" -Otto the Littlest Opossum.