Photo 11 — Close up view of the internal threads cut into the gas cap. The lathe head was turned manually (in reverse) several times to achieve these threads.
Photo 12 — Another example of a part machined on the 1220 XL machine. This threaded radiator cap is a plain cap or a touring cap if an owner does not want to use the more valuable grey hound radiator ornament while on a car tour or left overnight at a hotel. The plain cap can be further machined to bore a hole to accept the grey hound.
Photo 13 — The plain radiator cap threaded onto the mandrel used to machine this cap. The mandrel is solid stock of 12L14, an alloy which gives a smooth, machined surface and because of its low friction component allows for increased tool life. 12L14 is commonly referred to by the trade name Ledloyâ„¢ The mandrel would be needed if the center were to be bored out or the edge knurled.
Photo 14 — Automobiles of the 1920's and 1930's used a cigar lighter with a pull cord tip. The tip could removed and fitted with a work light, useful when changing a tire in the dark. These tips are often broken or missing and replacements were machined on the 1220 XL machine.
Photo 15 — Cigar lighter parts: Jamb-locking nuts, threaded bezels, lighter main body, and threaded tip (which holds the heating element). Parts like these are small and require a mandrel to chuck the work piece as part of the machining process.
Photo 16 — Closer view of the cigar lighter parts, all requiring turning on the lathe or precision drilling and all required some sort of mandrel, both with male and female threads.