#garfield Logs

Apr 28 2024

02:35 AM rue_shop3: 51mm OD
02:50 AM rue_shop3: no
02:50 AM rue_shop3: 51mmid
02:50 AM rue_shop3: 56mm od
02:50 AM rue_shop3: 1.5mm z
12:46 PM aandrew: polprog: you could do that with two-sided flex -- same alternating pattern on top and bottom but offset by half the conductive pad width... I think the difference in capacitance would be bigger since the thickness is so much less, but I bet it'd be a lot cheaper
12:47 PM aandrew: I wonder if you could do it cheap with just a piece of paper and soft pencil
12:47 PM aandrew: maybe not
12:48 PM aandrew: no I don't think it will becuase the conductive pads aren't actually moving relative to each other
12:48 PM aandrew: maybe two pieces of paper that can slide relative to each other as they bend
12:49 PM aandrew: the flex idea might work then too and be cheaper since it's just two single sided pieces of flex. with the right geometry they'd be identical just flipped
12:50 PM aandrew: and a mounting that is fixed at one end but lets the other end slide a bit... the top side would be fixed-mounted on the left (for example) and the bottom one would be fixed-mounted on the right
12:50 PM aandrew: damn I don't need another project
12:51 PM aandrew: but yeah, exciting the capacitor with a few tens of MHz would be trivial, as would measuring the amount of coupling
12:51 PM aandrew: I still really like LVDTs that rue_mohr built a couple years ago
12:59 PM rue_mohr: hi
01:02 PM Tom_L: mhi
01:20 PM rue_mohr: on call, so I'm sitting at home by a cell phone not doin much
01:28 PM Tom_L: cell phones are portable. you don't have to just sit
01:28 PM Tom_L: but yeah, it's a lazy day here too
01:30 PM rue_mohr: I should do things in the garden, but its raining
01:30 PM rue_mohr: pondering robot body design
01:40 PM Tom_L: may do a test run on this GUI for the mill
01:44 PM rue_mohr: ? test?
01:46 PM aandrew: I was at legoland all day yesterday, going back today for the marine park
01:46 PM aandrew: definitely not lazy days here
01:47 PM rue_mohr: cool!!!
01:48 PM Tom_L: dumped all the pics of it or i'd post one
01:49 PM Tom_L: yeah we've been working on a diy gui for linuxcnc
01:49 PM Tom_L: drop a widget on the screen and the supporting code is magically there
01:50 PM Tom_L: https://github.com/jethornton/flexgui
01:50 PM Tom_L: https://www.gnipsel.com/linuxcnc/flexgui/index.html
01:54 PM rue_mohr: cool!
02:06 PM Tom_L: pyqt
02:06 PM Tom_L: https://realpython.com/qt-designer-python/
02:41 PM rue_mohr: the QT code is unstable, every release, every one who uses it has to completely rewrite their softwre
02:45 PM rue_mohr: I think your ok casue the python team has to do the rewrite
02:46 PM rue_mohr: but, often python just forwards the methods, so if the call arguments change (which they do between QT versions) you still might have to rewrite your python code
02:46 PM rue_mohr: EVERY qt release