122GHz Feedhorn machining

Time to turn the CAD design into something physical. Brass rod and my ancient Colchester 1800 and Bridgeport have come up with this as a first try. The barrel adjuster permits positioning the back of the waveguide flush with the inner end of the 8mm cavity, and up to about 6mm inside the reamed 4mm tube. Normal setting will probably be around 1.6mm

Complete horn assembly
Fusion360 model
Small, isn’t it!
Horn and 2mm waveguide with threaded barrel
Mounting detail

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