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<superkuh>
Do you think such a thing as a 3/4" NPT to KF-40 adapter exists? So far I cannot find one.
<superkuh>
Closest find was a 1/4" NPT to KF-16.
<superkuh>
Or 1" NPT to KF-40.
<superkuh>
I suppose given that spread one likely exists.
<superkuh>
Oh. lesker has them. How did I miss that before...
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<Noxz>
so, interested in the direct laser exposure system.. looks like the smallest ball screw (I know leadscrew is listed) that I can find has a 1mm pitch.. combined with a 0.9deg (400 step) stepper would give a resolution of 2.5micron.. curious if that is enough.. I would think it would certainly be better than the leadscrew alternative, also much more expensive ($100+ for each axis)
<Noxz>
and maybe if the controller has microstepping then you should be able to get somewhat better resolution
<Noxz>
would probably come down to the resolution of the laser point, and how fast on/off can be
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<diginet>
Noxz: I highly doubt you could get to 2.5micron with open loop
<diginet>
you'd probably need closed loop linear motors to get that kind of resolution
<SpeedEvil>
Resolution - great.
<SpeedEvil>
accuracy is a whole different thing
<diginet>
yeah, that too
<Noxz>
which is why I was looking at ballscres instead of leadscrews
<diginet>
Noxz: even stil
<diginet>
*still
<Noxz>
going in the right direction?
<diginet>
Noxz: maybe, I still think that ballscrews even would have too much backlash
<diginet>
IIRC most micro-positioning stages use linear motors or voice coils
<Noxz>
even with an anti backlash screw?
<diginet>
(or even piezos if you want to get really expensive)
<diginet>
probably yes
<Noxz>
what should the working area be? probably no more than 20mm ?
<diginet>
sounds about right I suppose
<diginet>
I still think you'd have more luck with film photomasks, though I can can certainly understand the appeal of a direct write laser system
<diginet>
another option that I've seen is used a projector through a microscope
<diginet>
you can get about 10micron with that
<Noxz>
hrm
<diginet>
another problem is drift, since a direct write system is going to be slow
<Noxz>
define drift in this context, please?
* SpeedEvil
would really like a 100:1 pair of hands
<Noxz>
heh
<SpeedEvil>
To be able to directly screw with small stuff
<diginet>
As I understand it, it's hard to get absolute positioning over a long period of time because the substrate will shift around due to things like vibrations
<diginet>
(sorry for the poor/imprecise definition)
<Noxz>
so, use some kinda glue?
<SpeedEvil>
duct tape
<Noxz>
double sided scotch tape
<diginet>
Noxz: at the sizes we're talking about, walking near it softly could be enough
<diginet>
(maybe, could be wrong on that)
<Noxz>
I wonder how silicon valley handles the occaisional earthwuake
<diginet>
keep in mind it's less of an issue for photomasks, since it exposes very quickly
<diginet>
also you can get vibration damping tables
<diginet>
(like for optics)
<diginet>
but they're expensive
<diginet>
some holographers have built sand tables before, which supposedly help
<Noxz>
CNCs sometimes have an epoxy/granite base to reduce vibrations
<Noxz>
big routers
<diginet>
Noxz: yeah those would probably work too
<diginet>
I've also seen people use tires
<Noxz>
they use recycled tired under the trolley tracks
<Noxz>
smigin': an extremely small unit of measure
<Noxz>
a quick search landed me here: http://search.newport.com/?q=*&x2=sku&q2=8302 .. I guess if you have the money.. it all depends what you want out of it
<diginet>
keep in mind, that only has 1in travel
<diginet>
which might be find for your needs, but can be limiting
<Noxz>
right, my needs are to make a tiny mechanical watch
<Noxz>
not MEMS
<Noxz>
but, using similar techniques
<Noxz>
also, need vs want
<Noxz>
having a vacuum would be more important for a photomask, to get good exposure and not have any artifacts, correct?