<Degi>
I think the ECP5 would be a good fit, has fully working open source toolchain and is pretty fast
<Degi>
Hmh, sure that heating the water would help?
<Degi>
Unless you pressurize it a lot, you have a high heat of vaporization (around 2 kJ per ml?)
<Degi>
Nice paper
<fltrz>
not heating the water, just lowering pressure so room temp but soft vacuum, just to bring it close to boiling point so more liquid is converted to steam blowing away the metal swarf
<fltrz>
what is the ECPS?
<fltrz>
*ECP5?
<Degi>
An FPGA
<fltrz>
but your right the liquid electrode idea is probably bad, because it would evaporate and put all the negative salt ions over the positively charged metal workpiece
<fltrz>
ah yeah the FPGA
<Degi>
Use evaporating ions
<fltrz>
not familiar, what are evaporating ions?
<Degi>
Maybe dissolved CO2 which turns to HCO3+
<fltrz>
it will be a surplus of negative ions on the tool, that gets splattered over the workpiece
<fltrz>
so in case of CO2 in water I presume OH-
<fltrz>
btw, this starts to look like ECM which is also used for micro machining
<fltrz>
electro chemical machining
<Degi>
Oh
<Degi>
Can you just electrolyze it away haha
<Degi>
Hm, would that not destroy the working electrode
<fltrz>
the techniques are often combined
<Degi>
The plating products
<Degi>
The OH- should react with the HCO3+ I think
<fltrz>
what I meant is that if you use a liquid conducting electrode, say OH- and HCO3+ ions in water, then charging the tool electrode negatively will cause a surplus of negative OH- at the tool tip, and a surplus of HCO3+ at the solid electrode inside the tool used to charge the tool
<Degi>
HM yes
<Degi>
Would the electrode be like a glass tube?
<fltrz>
but now that I think of it, with liquid wearless electrode, you could swap around the voltages since one is essentially wearless
<fltrz>
yes was thinking micro pipette
<fltrz>
do you know of a cheap source of miniature polarizing beam splitters?
<fltrz>
I know a cheap source of QWP's
<Degi>
No idea
<Degi>
Arent all splitters polarizing? At least somewhat?
<fltrz>
so the paper for the homodyne wavelength stabilizing interferometer uses some idealized components like beamsplitters and polarizing beam splitters
<fltrz>
Degi, was thinking the same, reproduce the optical layout in an optics simulator, and calculate the ray expressions on paper, then use the parasitic polarization of float glass at an angle to effectively get the same results but perhaps different angles than simple cubic ideal non-polarizing and ideal polarizing BS's
<fltrz>
to further empcheapen their design
<Degi>
How do you differentiate between nonpolarizing and polarizing?
<Degi>
Different kinds of glass?
<fltrz>
possibly, but I think using brewster angle might suffice
<Degi>
Oh right, that is polarization dependent rgith
<fltrz>
so it might be possible to make the optical layout even less clear on first sight, but be perfectly equivalent functionally
<fltrz>
and shitloads cheaper
<Degi>
Thatd be nice
<Degi>
Can it be partially 3D printed with resin printer and clear resin?
<fltrz>
not sure, but scoring microscope slides is not that difficult?
<Degi>
Hm yes
<Degi>
Though printing a monolithic optical assembly could be neat
<fltrz>
like how they make super sharp glass blades for microtomes
<fltrz>
that would be neat, but not sure how to get optical flats, also worried about unintentional birefringence from stretched unevenly cooled plastic
<Degi>
Hm, the plastic stays at the same temperature
<fltrz>
I mean while printing
<Degi>
Well, should, if you don't put a 1 kW UV lamp into the printer
<fltrz>
or anneal after printing or smth?
<Degi>
I mean the printer should be at room temperature
<fltrz>
hmm, it would be nice to see someone test that
<Degi>
Though the 100 W UV lamps might somewhat heat it
<fltrz>
you know the typical "drafting triangle" with polarized light photograph?
<Degi>
Hm no
<fltrz>
oh I understood 3d printer, you mean resin yes
<fltrz>
my bad
<Degi>
Ah you mean one of those traingles for drawing under a polarizer? Yeah
<Degi>
Nah, the resin printers *should* be near room temperature if you don't go all the way with UV
<fltrz>
woops forgetting to put the trash out, just a few minutes
<fltrz>
I think I will just use the poor man float glass at 45 deg interferometer, but between the laser and interferometer add another 45 degree piece of glass and just replicate the the wavelength sensing arm: drop on diffraction grating (probably piece of CD-ROM) and measure the 0th and 1st order reflections
<fltrz>
essentially what I asked at 20<fltrz> I was also just thinking, what about temperature stabilization (a bit above temperature) and optionally a diffraction grating for selecting a precise wavelength? " followed by your "<Degi> The grating reflecting approach might be worth a try xD" especially since that seems what the wavelength stabilization arm is doing in the paper
<fltrz>
but they use a transmission grating, but that can also be made from a CD rom, but I prefer the reflection mode on CD romm
<fltrz>
anyway time to sleep
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<Degi>
Hm
<Degi>
Re: Transmission Grating
<Degi>
Get a surface reflective grating from Ebay and press it into some hot plastic
<fltrz>
Degi, better than CD ROM?
<fltrz>
err, meant CD-RW
<fltrz>
because those are unpatterned
<fltrz>
but I see what you say, like the chocolate trick
<fltrz>
or haw mass production of holograms happen
<fltrz>
I'm wondering if theres some kind of reversal method I can use to take into account thermal expansion of the grating and possibly also a reversal method for change of index of refraction of air
<fltrz>
the wavelength stabilization paper monitors the temperature of the grating by attaching a thermistor to it
<fltrz>
machining the grating out of invar should work
<fltrz>
or at least improve frequency response because thermistor and grating may have slightly diff temperatures
<fltrz>
but I still don't like how acoustic compression of air is ignored...
<fltrz>
I don't want wavelength to be overcompensated because of some low level noise near the wavelength regulator
<fltrz>
if a reversal method can be devised making it out of plastic would be fine for me