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   gigabecquerel (gigabecquerel@chaos.social)'s status on Saturday, 30-Nov-2024 05:56:52 JST gigabecquerel

   in reply to

   • ftg

   @ftg They're... ok!
   Not great, but for around 5€ a pop you really can't complain.
   The grease they're packed with was a bit thick for my liking, so I swapped it for something thinner (the prusa lube that comes with the printers), which revealed some wiggle room and a few rough spots on the threads. Nothing deal breaking at all!
   I'm happy with them.

   https://de.aliexpress.com/item/32883962660.html?

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     ftg (ftg@mastodon.radio)'s status on Saturday, 30-Nov-2024 05:56:54 JST ftg

     in reply to

     @gigabecquerel
     Excellent, thank you!
     My potential use a little bit different. As I want them for fine tuning some mmW Gunndiode oscillators I plan on building at some point in the future.
     When I get better at machining.

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Saturday, 30-Nov-2024 05:56:55 JST gigabecquerel

     in reply to

     • ftg

     @ftg This one is an original one from mitutoyo, I think I found it at a flea market?
     But there are similar ones on aliexpress for around 5 €, I've ordered a few and will report back!

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     ftg (ftg@mastodon.radio)'s status on Saturday, 30-Nov-2024 05:56:56 JST ftg

     in reply to

     @gigabecquerel
     Where did you buy the micrometer mechanism?
     I might have a use for a few small one's and I'm interested in what they usually cost.

     Well, what the one's that are not from Puuilo or Lidl.

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Saturday, 30-Nov-2024 05:56:58 JST gigabecquerel

     in reply to

     Hmmmnice.
     It works as expected, and the kinematics reduce the mvement by a factor of ~3, so every Division moves the center by ~3 um.
     Should be just about ok, meaning that the piezo can do the rest of the Z travel.
     Issue is that I now need to constrain the ball on the micrometer, which means that I either have to grind a cup in the micrometer shaft or buy a different micrometer with a rounded tip to take the ball out entirely.

     ...maybe I should build a dremel tool mount for the lathe.

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Saturday, 30-Nov-2024 05:56:59 JST gigabecquerel

     in reply to

     The basic kinematic coupling is already soooo satisfying to play with!

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Saturday, 30-Nov-2024 05:57:00 JST gigabecquerel

     in reply to

     This looks... ok?
     Provided I can cut the glass, that V-Groove is going to be fun. I have an idea or two.

     Tests to be done!
     The Piezo (why does fusion render brass blue??) does X/Y/Z for the actual raster, the micrometer provides rough (maybe too rough?) Z travel and the kinematic coupling between both plates in combination with the right material choices *should* cancel out most of my thermal expansion to keep it all stable.
     Piezo - Glass rod - Needle are one replacable assembly.

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Saturday, 30-Nov-2024 05:57:01 JST gigabecquerel

     in reply to

     Ohhh I can build it in a way that the CTEs cancel each other out perfectly(ish)

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Saturday, 30-Nov-2024 05:57:02 JST gigabecquerel

     in reply to

     Dang why does everything have such a high CTE

     50 nm per K in Z.... maybe that can be compensated with the right materials to even out... kinda.

     Maybe I just build everything out of fused silica and invar

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Saturday, 30-Nov-2024 05:57:03 JST gigabecquerel

     Hm

     So

     An AFM / STM isn't *that* hard to build, right?