The Lie Group Structure of Cool.

That's 3 arc seconds shift, but I'd like better! More resolution! Bigger lens! Bigger everything! Make it the size of a bus!

Ghetto #autocollimator made out of the junk the neuroscience nerds leave around. Now that I have it working I'll try a lens with a huge focal length.

Very pretty and slightly maddening little stainless part for neuroscience with lots of angles and precise little dowel pin holes and shoulder screws slip fits etc

Oh dear God this is tiring "work".

I'm gonna start scraping with very very modest aims and try to get a feel for it but I'd like to scrape some square stuff and some dovetails hopefully.

#machinescraping

It's pretty fun.

Relapsed the OD and base of this magnetic eBay cylinder square to +/-0.0001" (2.5 micron) after work today. Much improved over the initial half-thou error. Absolutely incredible what OD laps can do for circularity and surface finish. The main issue starting were the weird non-circularities...

Maintain a phlegmatic temperament when possible for optimal machine scraping.

Wave compression springs and garter springs in the smaller ID's both make excellent jewelry for the dandy machinist.