#qi-hardware IRC log for Tuesday, 2014-12-02

whitequarkwpwrak: DocScrutinizer05: so I machined some glass on my CNC mill03:08
whitequarkturns out to be very easy03:08
wpwrakpictures or it's a lie ! :)03:30
whitequark4k rpm, 120 mm/min, helical milling with .2mm step03:40
DocScrutinizer05you're sure that's not been a diamond mill?03:43
DocScrutinizer05what type of glass is this?03:44
whitequarki'm sure it IS a diamond mill, I paid $15 for it!03:44
DocScrutinizer05aaah, ok03:45
whitequarkactually more like a diamond crown03:45
whitequarkcan work as both mill and drill03:45
DocScrutinizer05how did you dig in to the material?03:45
whitequarkhelical milling03:46
whitequarkI did no vertical plunge03:46
DocScrutinizer05I can see how to go X,Y, but Z axis is quite a bit problematic03:46
whitequarkbut I could in fact just plunge it in slowly, helical is just much easier to code03:46
whitequarkand also I don't need to slot in *glass* if I do helical03:47
whitequarkheck, deep slotting is bad enough in acrylic, much less glass03:47
DocScrutinizer05yep, indeed03:47
DocScrutinizer05well, the milling speed obviously approaches zero in center of milling tool03:48
whitequarkit has no center in fact03:48
whitequarkas I've said, it's like a crown. a hollow cylinder03:48
DocScrutinizer05weird shit03:49
whitequarkit's some expensive dremel thing03:49
whitequarkwell, not really that expensive as endmills go03:49
whitequarkbut expensive for a typical consumer :D03:49
whitequarkthe glass is a bathroom mirror shelf03:50
whitequarkthey go for about forty cents each03:50
whitequarkand you don't even have to cut them to size03:51
DocScrutinizer05I'd like to see what a CNC and rubber with abrasive tool can do for glas polishing03:51
whitequarkit'll work well, why not03:51
whitequarkalthough I would go for green chrome siht03:51
whitequarkwith conventional abrasives like sandpaper you need to go down many sizes03:52
whitequarkwith green chrome shit you can take like five last steps and do it in one03:52
DocScrutinizer05there's such rubber dremel tool with dunnowhat abrasive embedded03:52
DocScrutinizer05never heard of chrome shit ;-)03:53
whitequarkhard green paste made out of CrO3 and paraffine03:53
whitequarkit's ... very soviet03:53
whitequarkI'm fairly sure they don't even make it in civilized world anymore03:54
whitequarkbut it worked way better for me at polishing acrylic than increasing sandpaper grit03:54
whitequarkmuch less hassle03:54
whitequarkalso my coolant pump has been very handy for this, naturally03:55
wpwrakneat :) and i see that the victim boards are having a busy time ;-)03:56
whitequarkit's a solid chunk of HDPE03:56
whitequarkI'm not gentle with it, after all I can always mill off a top layer03:57
whitequarkor just throw it out entirely03:57
DocScrutinizer05ok, that rubber thing cannot do +anything* to glass03:59
whitequarkoh? is it softer?04:00
DocScrutinizer05seems so04:00
DocScrutinizer05maybe there's no abrasive embedded04:00
DocScrutinizer05I always just thought there must be, since pure rubber wouldn't make too mucj sense04:01
whitequarkyou can polish with like, just cloth04:01
DocScrutinizer05andway the "huge" cylindrical thing didn't scratch a dent into glass during 30s at 22k04:01
whitequarklike for example, I reassembled my rotary vane vacuum pump04:01
whitequarkand the actual pumping thing was made of cast iron04:02
whitequarkwhich I cleaned in the ultrasonic cleaner, naturally filled with water04:02
wpwrakoh, water ? funny. i normally use boiling nitrofluoric acid ;-)04:23
whitequarkoh, I forgot about this window04:23
whitequarkso the end of the story is that cast iron, it turns out, rusts literally as you gaze upon it04:23
wpwrakhmm. so that pump wasn't intended for liquids ?04:28
whitequark>vacuum pump04:29
wpwrakah :)04:29
wpwrakdry vacuum ;-)04:29
whitequarkum, is there any other kind04:33
wpwrakyou'd be surprised what google will find ;-)04:36
arhuacoHi there. Anybody has experience with RC planes? I liked the design here. https://www.youtube.com/watch?v=gNKO1RhmkMM06:22
DocScrutinizer05arhuaco: well, with a strong motor you can make your TV sofa fly07:55
DocScrutinizer05think of this thing as a helicopter in unusual flight position07:57
DocScrutinizer05it's not actually what you'd call a airplane07:58
arhuacoDocScrutinizer05: :-)08:09
arhuacoDocScrutinizer05: It doesn't seem that bad :-P 08:13
kristianpauli blame usb hubs that dont let powercycle by /sys..21:08
--- Wed Dec 3 201400:00

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