2014-02-01 00:06 arielenter has quit [Quit: Leaving.] 2014-02-01 00:11 wpwrak DocScrutinizer05: will take a picture of the "brackets for power supply" when I get back from fosdem, maybe you'll have an idea by seeing it 2014-02-01 00:17 wej has quit [Ping timeout: 260 seconds] 2014-02-01 00:18 wej has joined #qi-hardware 2014-02-01 00:22 Nuernberg gingerbread and cookies are yummy :) 2014-02-01 00:25 yup 2014-02-01 00:25 but stricly a xmas thing 2014-02-01 00:53 wolfspra1l has joined #qi-hardware 2014-02-01 00:54 wolfspraul has quit [Read error: Operation timed out] 2014-02-01 01:55 dos1: the rest of the year, they're highly toxic 2014-02-01 02:02 :o 2014-02-01 02:17 dos1 has quit [Ping timeout: 252 seconds] 2014-02-01 04:21 rather not available. Those which *are* nevertheless actually might not be that tasty, dunno if they even are toxic. Maybe, at least for germs etc 2014-02-01 04:22 ok, I know one place where you get fresh juicy stuff during the whole year 2014-02-01 04:23 maybe even a second, though that might have changed years ago and I wouldn't have noticed 2014-02-01 04:27 I also dunno how much of the cinnamon is Cassia which has cumarin 2014-02-01 04:31 cumarin itself is obviously highly controversial and interesting a substance 2014-02-01 04:34 from medicine to toxin it has everything, broad range from carcinogen to healing cancer to killing rats to derivative warfarin (4-hydro-cumarin) blood thinner, to same substance killing kettle 2014-02-01 04:36 kettle? dang! 2014-02-01 04:36 cattle 2014-02-01 04:41 probably the best widely available mass product: http://www.haeberlein-metzger.de/ (of course you can find better stuff when you know where to ask for it) 2014-02-01 04:44 OMG! 2014-02-01 04:45 Aachener Printen- und Schokoladenfabrik 2014-02-01 04:45 Henry Lambertz GmbH & Co. KG 2014-02-01 04:45 Borchersstr. 18 2014-02-01 04:45 D-52072 Aachen 2014-02-01 04:45 LOL 2014-02-01 04:51 meh, as usual 2014-02-01 04:51 anyway, get "Elisen-Lebkucjen". Those are no fake 2014-02-01 04:51 s/j/h 2014-02-01 04:51 DocScrutinizer05 meant: "anyway, get "Elisen-Lebkuchen". Those are no fake" 2014-02-01 04:58 managed to solder ATTiny13 now want to test continuity test....this is the pinout http://circuits.datasheetdir.com/18/ATTINY13-pinout.jpg ..... should it beep when i place the multimeter red cable to Pin 8 (VCC) and black cable of the multimeter to Pin 4 (GND) ? 2014-02-01 05:16 no 2014-02-01 05:19 actually you should be very careful with probing. You can even destroy components when the meter is cheap and poor quality or the component very delicate 2014-02-01 05:20 particularly with continuity test which applies unknown voltage to the Device Under Test 2014-02-01 05:21 some of the better multimeters have a continuity test and a diode test. The continuity test is usually safe in this case, and the diode test is less safe but still mostly safe 2014-02-01 05:22 xiangfu has joined #qi-hardware 2014-02-01 05:22 cheap multimeters however may not have 0.3V for continuity and 0.9V high impedance for diode test, but I seen even 9V(!) on continuity 2014-02-01 05:26 from V+ to GND of your ATtiny anyway there shouln't flow more than maybe 1uA when not active (running program). This is definitely not enough for any continuity tester to start beeping 2014-02-01 05:28 continuity tests should get done along traces and across solder points, but usually *not* across components 2014-02-01 05:30 and you might want to think twice when deciding where to place red and black probe. E.G. when you test if pin4 is correctly connected to the PCB, you rather place red to the PCB and black to pin4, so the GND pin of chip is actually minus wrt any other point on PCB when it's NOT connected correctly 2014-02-01 05:32 on a general note: I guess there are fewer people living on this planet that know how to probe correctly that those who really know c++ 2014-02-01 05:32 than thaose* 2014-02-01 05:32 probing is a really high art 2014-02-01 05:37 >>Only those who have measured a lot of rubbish will learn how to measure what's important with few measurements. << 2014-02-01 05:45 make sure your multimeter has no "high" voltage on the probe tips when in continuity test! easy way when you have no second meter: taste both tips same time. You can taste voltage that is dangerous for chips 2014-02-01 05:45 (no, I'm not kidding you :-D ) 2014-02-01 05:45 xiangfu has quit [Ping timeout: 264 seconds] 2014-02-01 05:46 9V battery is already slightly achy, but still perfectly harmless. and you can easily detect even 1.2V 2014-02-01 05:46 with your tongue 2014-02-01 05:47 if you never before done it, practice with a 1.5V battery to get an idea how it "tastes" 2014-02-01 05:48 an age old very accurate and sensible way to test for low voltages. Make damn sure you don't use this method on 220V! ;-P 2014-02-01 05:49 actually I'd recommend to stay away from 12V already 2014-02-01 05:52 ooh, and another iron rule (maybe too obvious but I don't want to have missed mentioning it): NEVER probe power sources of any kind for Ampere! 2014-02-01 05:54 you wouldn't believe how many users try to not only probe for the 220V in the mains outlet but also for the 16A written on the fuse in their fuse box. They actually switch the meter to Ampere and plug it into the mains outlet 2014-02-01 05:56 there's a reason why better multimeters have a common ground jack but distinct Ampere jack and Volt/Ohm/blabla jack. 2014-02-01 05:57 and the cheaper meters actually make it very easy to accidentally switch the meter range to Ampere from volt when turning the selector knob to "off" position. I've seen several meters explode because of exactly that 2014-02-01 05:59 as a general rule you probe for ampere only where you have CUT UP a wire or trace or the like, and place the probes to both open ends of that cut wire 2014-02-01 06:01 test points that are not supposed to normally touch each other are usually not suited for Ampere measurements between them 2014-02-01 06:49 DocScrutinizer05: just came back and saw your message :) 2014-02-01 06:50 DocScrutinizer05: hope I didn't fry the MCU as I tried earlier with continuity test and it didn't beep as you said 2014-02-01 06:50 DocScrutinizer05: what's the best thing to do to check if the MCU is ok ? 2014-02-01 06:51 operate it 2014-02-01 06:51 DocScrutinizer05: when you say "operate it" .. you mean program it ? 2014-02-01 06:51 like try to flash a program into it ? 2014-02-01 06:51 for example, yes 2014-02-01 06:51 ahh ok 2014-02-01 06:52 so it's not like testing a 555 when you can test with multimeter 2014-02-01 06:52 hardly, since this chip has no special pins 2014-02-01 06:53 I don't know what it's supposed to behave like when you power it up with no user program flashed. Does it come with a factory program that wiggles all pins? does it come with empty program storage and does nothing at all? I dunno 2014-02-01 06:54 and I guess there's no "simple" special signal like a clock or sth that you can probe, that is supposed to always show sth recognizable 2014-02-01 06:55 understood..ok be right back 2014-02-01 07:03 I'd think for safety reasons all pins will be in high-Z input state and nothing will happen. the chip should "act dead" 2014-02-01 07:05 maybe Atmel shipped it with a factory test program though, that listens for a certain challenge on one pin and then runs some test program taht would wiggle pins or echo state of one pin to another, or sth like that 2014-02-01 07:07 nah don't think so...but let me read the datasheet 2014-02-01 07:08 DocScrutinizer05: this is the board http://ctrlv.in/289870 2014-02-01 07:09 I guess it's same like yesterday? 2014-02-01 07:10 http://ctrlv.in/289871 2014-02-01 07:10 it's populated now with MCU :) 2014-02-01 07:10 haha 2014-02-01 07:10 it looks like your solder oxidized due to too high soldering temperature 2014-02-01 07:11 wish that MCU vendors should upload some test program so that we can know whether MCU is working fine or not 2014-02-01 07:11 yeah still need to stabilise my soldering skills...it's still very rough 2014-02-01 07:11 not as smooth as wpwrak's 2014-02-01 07:15 http://www.youtube.com/watch?v=b9FC9fAlfQE&noredirect=1 2014-02-01 07:16 i've see that video...i think the problem is my soldering tip is not that good...as i notice sometimes the solder 'sticks' to it 2014-02-01 07:17 your iron is too hot 2014-02-01 07:21 "add some more flux here, as you can never have too much" 2014-02-01 07:22 i put flux and it become too much :) 2014-02-01 07:26 do you also think that the 2nd from right pin at 25:00 isn't soldered? 2014-02-01 07:27 24:30 2014-02-01 07:38 how do you know it's too much flux? 2014-02-01 07:39 did it act as cooling liquid for your iron, lowering the temperature so much that you can't melt the solder anymore? 2014-02-01 07:39 ;-) 2014-02-01 07:43 39:45 ! 2014-02-01 07:44 :50 2014-02-01 07:46 http://www.youtube.com/watch?feature=player_detailpage&v=b9FC9fAlfQE#t=2389 2014-02-01 07:49 http://www.youtube.com/watch?list=PL2862BF3631A5C1AA&feature=player_detailpage&v=J5Sb21qbpEQ !! 2014-02-01 08:24 nicksydney: http://www.youtube.com/watch?list=PL2862BF3631A5C1AA&feature=player_detailpage&v=fYz5nIHH0iY#t=326 2014-02-01 09:12 Ornotermes has quit [Ping timeout: 265 seconds] 2014-02-01 09:12 Ornotermes has joined #qi-hardware 2014-02-01 09:13 wej has quit [Ping timeout: 252 seconds] 2014-02-01 09:14 wej has joined #qi-hardware 2014-02-01 09:30 porchao has quit [*.net *.split] 2014-02-01 09:30 uwe_ has quit [*.net *.split] 2014-02-01 09:34 porchao has joined #qi-hardware 2014-02-01 09:34 uwe_ has joined #qi-hardware 2014-02-01 10:06 DocScrutinizer05: so I bought a new NE555N and fixed the spindle control board 2014-02-01 10:06 works? 2014-02-01 10:06 it works, except there's a weird quirk: it works exactly in reverse 2014-02-01 10:07 huh? 2014-02-01 10:07 when the speed control pot is on the min position, it spins at maximal speed 2014-02-01 10:07 and vice versa 2014-02-01 10:07 you swapped upper and lower end of poti 2014-02-01 10:07 I'm pretty sure I connected it the right way, because the cable has remembered the way it was twisted 2014-02-01 10:07 obviously not 2014-02-01 10:08 moreover, if I reverse the pot connector, it stops working properly, more specifically 2014-02-01 10:08 or your chip has inverted logic ;-) 2014-02-01 10:08 it spins at min speed in min position, but when I start to adjust it to the max, it spins faster for some time 2014-02-01 10:08 then at a certain position it stops spinning at all and the motor makes funny noises 2014-02-01 10:08 errr 2014-02-01 10:08 weird 2014-02-01 10:08 the consumed current also drops to almost zero at that point 2014-02-01 10:08 EXACTLY 2014-02-01 10:09 (inverted logic) I've desoldered an ST NE555N from there. I soldered an ST NE555N there. 2014-02-01 10:09 are you sure you didn't mix up the 555 component with some other technology? 2014-02-01 10:09 chips look exactly same except for lot number 2014-02-01 10:09 wtf?! 2014-02-01 10:10 exactly 2014-02-01 10:10 lemme think a while about it 2014-02-01 10:10 antoniodariush has joined #qi-hardware 2014-02-01 10:12 antoniodariush has left #qi-hardware [#qi-hardware] 2014-02-01 10:15 do you have a scope? 2014-02-01 10:15 no :( 2014-02-01 10:15 it's practically impossible to import and I don't have spare $1200 to buy $200 scope locally 2014-02-01 10:16 I may have some friends with a scope though 2014-02-01 10:16 recheck all your solder points and the connectors 2014-02-01 10:16 mhm 2014-02-01 10:19 honestly when you swap left and right end of poti, it MUST work in inverse way. Logarithmic potis may behave unpleasant regarding huge spreading at one end and extreme sensitivity at other end, but the baisc function can't change by swapping left and right end *only* 2014-02-01 10:20 actually I think the cable is not symmetrical 2014-02-01 10:20 for me however that sounds like you swapped completely and when you try to swap back, you actually swap middle with one end 2014-02-01 10:21 see, the poti has a 3-pin molex connector on its wires. I can't mix it up completely, there are only 2 ways to plug it in 2014-02-01 10:21 and the cable is bent in a particular way which demonstrates how it's been installed before, apart from my recordings 2014-02-01 10:22 (solder joints) rechecked, no faults I can observe. retouched them all with a bit of flux, let me check the behavior. 2014-02-01 10:22 actually, hm, can RMA resistance lead to this weird effect? I can't see how 2014-02-01 10:22 I told you to swap upper and lower end of poti, not to turn around connector 2014-02-01 10:22 er 2014-02-01 10:22 what's RMA? 2014-02-01 10:22 rosin mildly activated 2014-02-01 10:23 (swap upper and lower end) ok, I'll do that, but why? obviously that won't correspond to original schematics? 2014-02-01 10:24 sorry, I can't diagnose stuff from remote without eyes and without schematics and without a layout of PCB 2014-02-01 10:24 oh, schematics and layout is easy, sec 2014-02-01 10:26 DocScrutinizer05: layout: http://i.imgur.com/6Wf0Az3.jpg 2014-02-01 10:28 hmm, and where is your poti plug? 2014-02-01 10:28 Rp1 2014-02-01 10:29 how many pins are unused between plug and LED? 2014-02-01 10:30 what do you mean? 2014-02-01 10:30 the must be a lot of unused posts 2014-02-01 10:31 how many of them between poti plug and LED? 2014-02-01 10:31 sorry, this is a systematic question 2014-02-01 10:32 none? PWM and STOP are unused, SW1 has a jumper between pins 2&3, LED is a LED, Rp1 is completely used by 3-pin poti plug. 2014-02-01 10:32 none is correct 2014-02-01 10:32 the plug is sym 2014-02-01 10:32 turning it 180° mustn't change a thing 2014-02-01 10:32 except the orientation of poti action 2014-02-01 10:33 ok, well, it does. -_- 2014-02-01 10:33 jumper is in "lower" position, next to poti plug? 2014-02-01 10:34 next to poti plug, yes 2014-02-01 10:34 I have NFC 2014-02-01 10:35 if it helps, I took a few pictures of the board: http://imgur.com/a/wWSIO 2014-02-01 10:35 NE555 open collector output defect 2014-02-01 10:35 sorry for quality, only have a webcam 2014-02-01 10:35 hm 2014-02-01 10:36 DocScrutinizer05: http://www.st.com/web/en/resource/technical/document/datasheet/CD00000479.pdf 2014-02-01 10:36 "The circuit may be triggered and reset on falling 2014-02-01 10:36 waveforms, and the output structure can source 2014-02-01 10:36 or sink up to 200 mA. 2014-02-01 10:36 "source or sink" doesn't sound like OC to me 2014-02-01 10:37 or just look at its schematics on page 2 2014-02-01 10:37 it is clearly push-pull 2014-02-01 10:38 that's absolutely mad shit 2014-02-01 10:39 but honestly, when your circuit doesn't work anymore when you turn poti plug 180° then poti is defect 2014-02-01 10:40 ooo, that can actually be true somehow 2014-02-01 10:40 since 555 was killed by 110V breakdown from the transformer 2014-02-01 10:40 a poti is an absolutely symmetric compnent, particularly when linear 2014-02-01 10:41 there might be a short between middle and one end 2014-02-01 10:42 or a break 2014-02-01 10:42 what size is poti? 2014-02-01 10:42 you got a DMM? 2014-02-01 10:42 DMM sure 2014-02-01 10:42 probe end to end 2014-02-01 10:43 or can you read what's written on poti? 2014-02-01 10:43 poti is this: http://www.openobject.org/physicalprogramming/images/b/b5/Potentiometer.jpg 2014-02-01 10:43 no markings on it 2014-02-01 10:43 wrong side 2014-02-01 10:43 ok, lemme look if I can unscrew 2014-02-01 10:43 value engraved into shielding pot 2014-02-01 10:44 usually other side of contacts 2014-02-01 10:44 #s/other/opposite 2014-02-01 10:44 unscrewed, it's B10K 2014-02-01 10:44 10k, makes sense 2014-02-01 10:44 probe if it has 10k between ends 2014-02-01 10:45 unplug for probing 2014-02-01 10:45 yep, unplugged. end to end is 12.2k 2014-02-01 10:45 o.O 2014-02-01 10:45 WTF NOW 2014-02-01 10:45 probe from middle to one end, turn poti slowly 2014-02-01 10:46 watch resistivity 2014-02-01 10:46 should be ~5k in middle pos 2014-02-01 10:46 doing it now 2014-02-01 10:46 either I'm doing it wrong or values make no sense, lemme recheck 2014-02-01 10:46 2.5k at 9o'clock pos and 7.5 at 15:00 pos 2014-02-01 10:48 looking at DMM while adjusting it. according to my DMM it's sometimes open and sometimes in 0-50k range seemingly randomly 2014-02-01 10:48 defect 2014-02-01 10:49 open the shield pot (has 4 latches) 2014-02-01 10:49 you'll find scortch marks on the carbon trace 2014-02-01 10:49 oops, yours has 5 latches 2014-02-01 10:50 4 latches actually, the image is a bit different 2014-02-01 10:51 anyway, opened it 2014-02-01 10:51 there are indeed some scratch marks, lemme photo it 2014-02-01 10:52 scorch 2014-02-01 10:52 scorch? 2014-02-01 10:52 burns 2014-02-01 10:53 oh, burn 2014-02-01 10:53 hm, no, nothing of kind 2014-02-01 10:53 http://imgur.com/a/rVY9h 2014-02-01 10:53 see that trace-like things on carbon? the entire surface is like that. but no, no burns 2014-02-01 10:54 those are from moving contact, normal 2014-02-01 10:54 check the 3 connector rivets, closely 2014-02-01 10:55 often when they burn, they do there 2014-02-01 10:56 rivets seem fine 2014-02-01 10:56 you could connect a 5V series 1kR to both outer contacts, and a LED between outer and middle 2014-02-01 10:56 better control than a DMM 2014-02-01 10:56 acoustic would be even better still 2014-02-01 10:57 ok, will do LED 2014-02-01 10:57 you can connect line out to both outer, and line in of next device (amp) to outer GND and middle 2014-02-01 10:58 should work perfectly to adjust audio volume between 0% (almost), and 100% (also almost) 2014-02-01 10:58 without any noise 2014-02-01 11:05 ok, there's a lot of noise 2014-02-01 11:07 appears to be shitty soldered rivets 2014-02-01 11:07 er 2014-02-01 11:07 no, they burned 2014-02-01 11:07 shitty riveted rivets or shitty soldered contacts 2014-02-01 11:07 hm 2014-02-01 11:08 why is stuff inside intact then? 2014-02-01 11:08 rather the carbon trace (there actually metal, I guess) burned under the rivet 2014-02-01 11:08 metal, yes 2014-02-01 11:09 it's usual failure pattern for poti which seen too high current 2014-02-01 11:10 the rivets are the weakest part, the contacts of them to the carbon tace element 2014-02-01 11:11 *sometimes* you can fix by using a pair of pliers to fasten the rivet and spread it a little bit 2014-02-01 11:11 DocScrutinizer05: http://i.imgur.com/INOf6Ya.jpg 2014-02-01 11:12 I can't see anything. But the problem is under the metal latches 2014-02-01 11:12 around the rivet 2014-02-01 11:13 the carbon trace element is basically a simple PCB 2014-02-01 11:13 coated with a special "copper" layer 2014-02-01 11:16 I see 2014-02-01 11:17 ok, so I wanted to make it PWM anyway 2014-02-01 11:17 let me see if that even works on the stepper control board 2014-02-01 11:26 I need vodka or something 2014-02-01 11:26 for cleaning the PCBs of course 2014-02-01 11:27 they passed the law that you can't buy pure ethanol in >50ml quantities... 2014-02-01 11:31 whitequark: (flux) yes, flux very be nicely conductive. easily a few ten kOhm, maybe even more 2014-02-01 11:33 whitequark: i found out about that then i put a nice external 100 kOhm pull-up on an nRESET input of atusb. when i tried to turn on the still flux-loaded board, the damn chip wouldn't come out of reset ... took me a while to realize that the chip was perfectly healthy ... 2014-02-01 11:35 wpwrak: what flux wsa that? 2014-02-01 11:38 i think that was with a "water soluble" flux. but i guess they all can do that to a larger or smaller extent. 2014-02-01 11:38 "water soluble" ones are apparently much worse at this... 2014-02-01 11:38 maybe 2014-02-01 11:39 that makes total sense, they must be polar if they need to be soluble in water 2014-02-01 11:39 => mobile charge carriers 2014-02-01 11:40 this RMA residue doesn't have any resistance my DMM can measure 2014-02-01 11:41 (polar) yes, but there may be other fun things in the formula 2014-02-01 11:43 btw, i found a ""No Clean Water Washable Tack Flux": Chipquik SMD4300TF10. at digi-key as SMD4300TF10-ND 2014-02-01 11:43 works quite nicely. but a bit too tacky - you feel dirty working with it rather quickly 2014-02-01 11:55 mldr has quit [Remote host closed the connection] 2014-02-01 12:12 ok, I think I'm dumb 2014-02-01 12:12 this board has a component installed, it's a DC-DC converter 2014-02-01 12:12 from 5VDC to 5VDC 2014-02-01 12:12 what. 2014-02-01 12:12 oh, it's isolating, nevermind 2014-02-01 12:22 cool, the board has properly populated and connected ports for limit switches, probe, pwm and charge pump 2014-02-01 12:22 oh and spindle direction 2014-02-01 12:46 FDCX has quit [Remote host closed the connection] 2014-02-01 12:55 dos1 has joined #qi-hardware 2014-02-01 13:04 lekernel has joined #qi-hardware 2014-02-01 13:20 awesome. I now have a working machine and it even can do more than before 2014-02-01 13:20 at 24V my adjustable PSU has enough beef to drive 2 steppers and spindle at 100% 2014-02-01 13:22 and I now even have control of spindle via EMC2! 2014-02-01 13:35 ;-) 2014-02-01 13:36 in a way, they sent you exactly what you really wanted - a CNC mill you could modify at your heart's content without any remorse 2014-02-01 13:39 word. 2014-02-01 14:02 wpwrak: by the way, do you have any idea how to measure spindle speed? 2014-02-01 14:03 to calibrate it 2014-02-01 14:05 whitequark: optocouple 2014-02-01 14:08 roh: gotcha 2014-02-01 14:11 https://trac.raumfahrtagentur.org/wiki/Maschinen/CncFr%C3%A4se/SpindleMeter 2014-02-01 14:39 wej has quit [Ping timeout: 245 seconds] 2014-02-01 14:42 wej has joined #qi-hardware 2014-02-01 14:42 wpwrak: there are no unmodded mills... everybody mods 2014-02-01 14:42 nice you got speed control. we only have a pot on a box 2014-02-01 14:43 but the motor also eats 800W dc at something between 100 and 250V 2014-02-01 14:55 roh: (pot on a box) I had it too. but turns out that motor PCB has PWM in, and control PCB has PWM out 2014-02-01 14:56 so it was a matter of two wires and correct emc2 config 2014-02-01 15:36 rz2k has joined #qi-hardware 2014-02-01 15:37 whitequark: yeah. nice. 2014-02-01 15:50 lekernel has quit [Quit: Leaving] 2014-02-01 16:10 arielenter has joined #qi-hardware 2014-02-01 19:34 wej has quit [Read error: Connection reset by peer] 2014-02-01 19:36 wej has joined #qi-hardware 2014-02-01 21:23 valhalla_ has joined #qi-hardware 2014-02-01 21:24 valhalla has quit [Ping timeout: 272 seconds] 2014-02-01 21:36 rz2k has quit [] 2014-02-01 22:08 wej_ has joined #qi-hardware 2014-02-01 22:11 wej has quit [Ping timeout: 252 seconds] 2014-02-01 22:51 [commit] Werner Almesberger: ircstat/mlabs: not very smart script to download monthly log of #m-labs (master) http://qi-hw.com/p/wernermisc/62bd73e 2014-02-01 22:51 [commit] Werner Almesberger: ircstat/README: change date format from MMYY to YYMM (master) http://qi-hw.com/p/wernermisc/ebb0d27 2014-02-01 22:51 [commit] Werner Almesberger: ircstat/mlstat, stat: add the new year (2014) (master) http://qi-hw.com/p/wernermisc/037d65c 2014-02-01 22:51 [commit] Werner Almesberger: ircstat/ML: update for 2014-01 (master) http://qi-hw.com/p/wernermisc/57b53c6 2014-02-01 22:54 wpwrak: seq -f '%02.f' 1 12 2014-02-01 22:54 :) 2014-02-01 22:54 whitequark: (calibrate spindle speed) use a magnet in spindle - as "tool". and a coil you get near to the rotating magnet. Then listen to the audio output of that coil and compare to your piano ;-) 2014-02-01 22:55 DocScrutinizer05: I actually rather like roh's suggestion 2014-02-01 22:55 because it means emc2 will maintain spindle speed regardless of load 2014-02-01 22:55 err that suggestion is basically identical, just it uses more complicated sensor 2014-02-01 22:56 oooh, you want to permanently control spindle speed, not calibrate it? 2014-02-01 22:56 .s/control/meter/ 2014-02-01 22:57 I actually think measuring it permanently is better 2014-02-01 22:58 then go for the principle "scope across the 2 pcs 1R on" 2014-02-01 22:58 though I think a feedback loop to regulate spindle speed is massive overkill 2014-02-01 22:59 that feedback look is basically free 2014-02-01 22:59 because emc2 already implements it 2014-02-01 22:59 nfc what's emc2 2014-02-01 22:59 aka linuxcnc 2014-02-01 23:00 oh lol, no, that won't fly 2014-02-01 23:00 why? 2014-02-01 23:00 implementing a PID-regulator in software is sort of.... a PITA, given your hw limitations 2014-02-01 23:01 your loop turnaround time is way too high 2014-02-01 23:01 IOW the phaseshift is way too huge 2014-02-01 23:02 and it's definitely not 2for free" 2014-02-01 23:02 you can implement a dynamic calibration 2014-02-01 23:02 wait, why is turnaround time too high? 2014-02-01 23:03 which is sort of a PID with ultralong integral and zero differential component 2014-02-01 23:03 (seq) duh. new-fangled stuff ... 2014-02-01 23:05 http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Closed_Loop_Spindle_Speed_Control 2014-02-01 23:05 anyway I'd use voltage from electromotoric effect of spindle motor during PWM power off periods to conclude the current spindle speed 2014-02-01 23:07 or, even better, the inevitable noise in motor current from the motor switching coils while spinning 2014-02-01 23:09 actually some automotive components (cassette player, radio) use same effect from car generator to get engine RPM and thus background noise and adjust volume automatically 2014-02-01 23:10 in the end, your spindle turns at the RPM you've set it to via your PWM 2014-02-01 23:10 you don't really need any regulator loop 2014-02-01 23:10 hm 2014-02-01 23:10 that may well be true 2014-02-01 23:19 arielenter has quit [Ping timeout: 240 seconds]