the sherline designs aren't particularly notable, and they're pretty easy to replicate if you have working machine tools that are larger. any machinist could make a sherline mill or lathe, but without that floorspace and capex and skill, one really can't.

I spent overly long trying to learn on sherline tools and once I gave up and bought a Bridgeport and an old Logan, I realized that I was just banging my head against the limitations of the tools.

the value they had was that they were cheaper than the smaller version of the standard toolroom machines, and they were a way to bootstrap yourself without having the heavy power and the floorspace. so pretty much the storefront, not the IP. I still have their 4" rotary, and its actually not bad. the mill had a huge amount of flex in the column that made it pretty unusable for me unless you took really really tiny passes.

I had an old Unimat for a couple years, and while that was even _more_ dodgy than the sherline the fact that it was all steel and a combined mill/lathe made it a lot more interesting. would rather see some community standards for tooling on a platform like that. maybe a 50% larger so setup isn't so fiddly.