Useful Techniques for the Hobby Workshop

摘要

Long before I ordered the cast iron for the pulley, I designed the pulley using CAD. As part of the design process, I figured out the sequence of machining and the work holding. The pulley was designed to minimize the amount of metal to cut away. It was also designed to be easy to make and just fit within the limits of my lathe. I began by facing and surfacing the cast iron pulley blank without adjusting the angle of the top slide. This provided two reference surfaces I used later for alignment for each setup. The first stage was to machine the tapered bore. With tight tolerances and plenty of opportunity to get it wrong, I wanted to minimize time invested if it turned into a failure. With the reference surfaces defined, I then set about making the tapered bore.