<Noxz>
looked into differential screws a little bit more.. my small tap&die set has 0.7mm and 0.8mm (M4 & M5) thread pitches, which would mean 100um per rev - hook that up to a 200s/rev stepper and you got half a micron stepping resolution.. likely stick&slip is the greatest issue at that point - but super neat to rig together two screws together and a nut on ea platform to achieve such a th ing
<Noxz>
bed time &
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<pie_>
i want to tak one of my materials science textbooks with me because maaaaybe ill study, but i have to and thy are heavy and idk which to take :<
<pie_>
* /me will be away from home a couple months
<pie_>
otoh theres almost never a point to doing that because im busy doing other things...
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<jesseg>
odd, every time my internet takes a dump, my client cannot rejoin this channel automatically. It rejoins others automatically.
<jesseg>
well I don't know what I mussed.
<jesseg>
missed.
<jesseg>
but Noxz the last thing I saw you talking about was trying to get a finer pitched screw, or something.
<jesseg>
Differential screws are definitely what is used for really fine adjustments
<jesseg>
and I may have some differential screws I'd be willing to donate to the cause if you'd either use them or if never used them, send them back if you decided to not use them. Not a big deal. I just have too much junk that I'm never going to use :P
<john_cephalopoda>
It would be cool if people who get some process working could write a small outline about their set-up and steps and create a pull request for it in the wiki.
<jesseg>
I think I have only two axes though,
<jesseg>
.
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<Noxz>
jesseg, what style are they? micrometer heads?
<Noxz>
I also spent like 4 hrs last night, not sleeping, instead, designing in my head a differential rotational stage
<Noxz>
the issue I was trying to figure w/ the differential screw (linear not rotational) was how each endpoint will move in relation to how much screw, and at some point you may run out of screw for minimal movement, or rather, have such a large screw to get the distance you want
<Noxz>
ie, a 0.7 & 0.8 metric thread pitch would yield 100um displacement between the two endpoints.. and let's say you want a total travel of 10mm, so you would need 100 turns - or a 70 & 80mm screw to achieve this
<Noxz>
and not just a length of the screw, but a clear path for that nut to slide on that screw (hard to really say, btter with pictures.. the first one on wiki actually shows it well I think, the animated one
<Noxz>
I think my biggest issue is tracking location.. for this initial project huge accuracy isnt needed, but the idea of precision movement is useful elsewhere
<Noxz>
finally got some notebooks to, well, note stuff
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