--- Log opened Sat Nov 06 00:00:24 2021
01:18 < muurkha> happy J. S. Bach day!  on this day in 01717 Bach was imprisoned
01:57 < maaku> I made a hole-puncher on a lathe & mill once. Yay for machine shop.
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04:08 < abetusk> .title http://www.tobias-elze.de/pdfsandwich/
04:08 < saxo> pdfsandwich
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08:16 < nsh> ty muurkha 
08:16 < muurkha> np
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18:00 < muurkha> so there are these US$7 150mm digital calipers that are supposedly carbon fiber and have 10-micron resolution and repeatability
18:00 < muurkha> has anyone tried using them for positional feedback control?  done any measurements of tempco?
18:04 < muurkha> in theory a UD carbon-fiber or fused-quartz-fiber composite body should be capable of invar-like temperature insensitivity, and rumor has it that most such digital calipers use a pretty simple SPI-like BCD protocol internally
18:07 < muurkha> however, I am wary of the possibility that they're actually just shitty plastic, have some kind of ridiculous analog drift, etc.
18:19 < L29Ah> it is just plastic
18:20 < L29Ah> i recall there are reviews of the "carbon fiber" calipers on yt
18:41 < muurkha> bummer
18:42 < muurkha> I feel like non-fake ones would be super useful
18:43 < muurkha> though I guess one of the advantages claimed for zirconia joe blocks is that their TCE is matched to that of iron, so if they're the same temperature as the thing you're measuring or calibrating, and it's made of steel, the expansion of the joe blocks and the micrometer or workpiece or whatever will cancel each other out
18:44 < muurkha> (over other ceramic joe blocks, I mean, not over the usual steel joe blocks)
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22:14 < fenn> digital calipers often have a slow update rate, but it is possible to use them as a digital readout for position on a manual mill
22:15 < fenn> the actual measurement device is a circuit board, presumably fiberglass, with small capacitive rectangles on it
22:15 < fenn> there's no analog drift
22:16 < fenn> a carbon fiber circuit board would be conductive and the capacitance would be all messed up
22:53  * fenn mumbles something about daylight savings time
--- Log closed Sun Nov 07 00:00:25 2021