IRC log for #qi-hardware on 20141202

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03:08.32whitequarkwpwrak: DocScrutinizer05: so I machined some glass on my CNC mill
03:08.34whitequarkturns out to be very easy
03:09.05DocScrutinizer05duh!
03:28.14*** join/#qi-hardware rejon (~rejon@42-3-203-137.static.netvigator.com)
03:30.15wpwrakpictures or it's a lie ! :)
03:35.20whitequarkhttps://i.imgur.com/DJEeDbt.jpg
03:40.16whitequark4k rpm, 120 mm/min, helical milling with .2mm step
03:42.50DocScrutinizer05WOW°
03:43.19DocScrutinizer05you're sure that's not been a diamond mill?
03:44.24DocScrutinizer05what type of glass is this?
03:44.56whitequarki'm sure it IS a diamond mill, I paid $15 for it!
03:45.06DocScrutinizer05aaah, ok
03:45.33whitequarkactually more like a diamond crown
03:45.37whitequarkcan work as both mill and drill
03:45.44DocScrutinizer05how did you dig in to the material?
03:45.53DocScrutinizer05aaah
03:46.18whitequarkhelical milling
03:46.23whitequarkI did no vertical plunge
03:46.33DocScrutinizer05I can see how to go X,Y, but Z axis is quite a bit problematic
03:46.51DocScrutinizer05ok
03:46.54whitequarkbut I could in fact just plunge it in slowly, helical is just much easier to code
03:47.01whitequarkand also I don't need to slot in *glass* if I do helical
03:47.16whitequarkheck, deep slotting is bad enough in acrylic, much less glass
03:47.25DocScrutinizer05yep, indeed
03:48.05DocScrutinizer05well, the milling speed obviously approaches zero in center of milling tool
03:48.32whitequarkit has no center in fact
03:48.41whitequarkas I've said, it's like a crown. a hollow cylinder
03:48.41DocScrutinizer05oooh!
03:49.02DocScrutinizer05weird shit
03:49.04whitequarkit's some expensive dremel thing
03:49.29whitequarkwell, not really that expensive as endmills go
03:49.39whitequarkbut expensive for a typical consumer :D
03:50.50whitequarkthe glass is a bathroom mirror shelf
03:50.59whitequarkthey go for about forty cents each
03:51.08whitequarkand you don't even have to cut them to size
03:51.10DocScrutinizer05I'd like to see what a CNC and rubber with abrasive tool can do for glas polishing
03:51.25whitequarkit'll work well, why not
03:51.38whitequarkalthough I would go for green chrome siht
03:51.40whitequark*shit
03:52.01whitequarkwith conventional abrasives like sandpaper you need to go down many sizes
03:52.14whitequarkwith green chrome shit you can take like five last steps and do it in one
03:52.58DocScrutinizer05there's such rubber dremel tool with dunnowhat abrasive embedded
03:53.05whitequarkmeh
03:53.23DocScrutinizer05never heard of chrome shit ;-)
03:53.41whitequarkhard green paste made out of CrO3 and paraffine
03:53.47DocScrutinizer05ooh
03:53.52whitequarkit's ... very soviet
03:54.10whitequarkI'm fairly sure they don't even make it in civilized world anymore
03:54.32whitequarkbut it worked way better for me at polishing acrylic than increasing sandpaper grit
03:54.35whitequarkmuch less hassle
03:55.09whitequarkalso my coolant pump has been very handy for this, naturally
03:56.23wpwrakneat :) and i see that the victim boards are having a busy time ;-)
03:56.55whitequarkit's a solid chunk of HDPE
03:57.26whitequarkI'm not gentle with it, after all I can always mill off a top layer
03:57.30whitequarkor just throw it out entirely
03:59.49DocScrutinizer05ok, that rubber thing cannot do +anything* to glass
04:00.04whitequarkoh? is it softer?
04:00.24DocScrutinizer05seems so
04:00.39DocScrutinizer05maybe there's no abrasive embedded
04:01.02DocScrutinizer05I always just thought there must be, since pure rubber wouldn't make too mucj sense
04:01.14whitequarkmmm
04:01.27whitequarkyou can polish with like, just cloth
04:01.44DocScrutinizer05andway the "huge" cylindrical thing didn't scratch a dent into glass during 30s at 22k
04:01.51whitequarklike for example, I reassembled my rotary vane vacuum pump
04:02.01whitequarkand the actual pumping thing was made of cast iron
04:02.11whitequarkwhich I cleaned in the ultrasonic cleaner, naturally filled with water
04:23.21wpwrakoh, water ? funny. i normally use boiling nitrofluoric acid ;-)
04:23.40whitequarkoh, I forgot about this window
04:23.54whitequarkso the end of the story is that cast iron, it turns out, rusts literally as you gaze upon it
04:28.35wpwrakhmm. so that pump wasn't intended for liquids ?
04:29.07whitequark>vacuum pump
04:29.24wpwrakah :)
04:29.35wpwrakdry vacuum ;-)
04:33.18whitequarkum, is there any other kind
04:36.21wpwrakyou'd be surprised what google will find ;-)
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06:22.27arhuacoHi there. Anybody has experience with RC planes? I liked the design here. https://www.youtube.com/watch?v=gNKO1RhmkMM
07:55.25DocScrutinizer05arhuaco: well, with a strong motor you can make your TV sofa fly
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07:57.39DocScrutinizer05think of this thing as a helicopter in unusual flight position
07:58.07DocScrutinizer05it's not actually what you'd call a airplane
08:09.22arhuacoDocScrutinizer05: :-)
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08:13.12arhuacoDocScrutinizer05: It doesn't seem that bad :-P
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11:56.35*** topic/#qi-hardware is Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs and http://irclog.whitequark.org/qi-hardware
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21:08.47kristianpauli blame usb hubs that dont let powercycle by /sys..
21:08.48kristianpaul:(
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