Ancestors

Written by gigabecquerel on 2024-11-18 at 20:09

Hm

So

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

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Written by gigabecquerel on 2024-11-19 at 16:00

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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Written by gigabecquerel on 2024-11-19 at 17:42

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

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Written by gigabecquerel on 2024-11-19 at 21:20

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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Written by gigabecquerel on 2024-11-19 at 21:32

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

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Written by gigabecquerel on 2024-11-20 at 11:04

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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Written by ftg on 2024-11-20 at 22:59

@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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Written by gigabecquerel on 2024-11-21 at 07:58

@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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Toot

Written by ftg on 2024-11-24 at 14:58

@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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Descendants

Written by gigabecquerel on 2024-11-28 at 17:30

@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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Written by gigabecquerel on 2024-11-28 at 17:32

@ftg Also: The shaft isn't hardened, which saves me a lot of work, not having to grind the mitutoyo!

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Written by ftg on 2024-11-30 at 00:54

@gigabecquerel

Excellent. Threw one into the alibasket for the next order.

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