Mirrors made with spinning resin

[Paul Ferguson]

"For the telescope build in question, [Unnecessary Automation] needed a concave mirror. Trying to get that sort of shape with glass can be difficult. However, there’s such a thing as a “liquid mirror” where spinning fluid forms into a parabolic-like shape. Thus came the idea to spin liquid resin during curing to try and create a mirror with the right shape."


https://hackaday.com/2025/06/03/spin-cas...o-to-plan/