Hm
So
An AFM / STM isn't that hard to build, right?
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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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Ohhh I can build it in a way that the CTEs cancel each other out perfectly(ish)
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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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The basic kinematic coupling is already soooo satisfying to play with!
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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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This feels like it shouldn't work as well as it does
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This will be very interesting under the SEM
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Well that's disappointing, the tungsten has cracked on most of them, and the tip radii are on the order of a few 100 nm
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Just missing a few milling steps on the other side (two V-Grooves for the balls) and then I can try and case harden this thing!
Worst part was getting the blanks round, the lasercut edge was hard enough to ruin a few inserts :(
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Workholding adventures!
I've had a whoopsie or two, but it's functional, doesn't have to be pretty 😉
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@gigabecquerel At least there's evidence that you still have a minimum of one remaining hand. Major oopsie averted.
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@basil_hare Oh no, just "slipping out of the chuck" kind of whoopsies!
I keep fleshy parts far away from things that spin quickly, I've learned that lession on my small lathe.
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@gigabecquerel Very good. One must always protect the flesh.
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