#robotics Logs

Nov 11 2014

00:21 rue_shop2 ohm -r 0.1 -i 5.0
00:21 rue_shop2 Wattage is: 2.500000
00:21 rue_shop2 Current is: 5.000000
00:21 rue_shop2 Voltage is: 0.500000
00:21 rue_shop2 Resistance is : 0.100000
00:21 rue_shop2 I guess I need some 5W 1% 0.1R resistors
00:27 rue_shop2 think I can get away with 3W?
00:27 mrdata depends
00:28 mrdata power = V^2 / R
00:29 mrdata so, 3W seems okay
01:54 rue_house your not that good with overrating thigns are you?
02:20 rue_house "IM AN ALIEN GIVE ME THE DAMN CHOCOLATE BAR!!!"
02:31 mrdata rue, if your rule of thumb is always over-rate your parts, then you create a market for fake components
02:43 rue_house already is, did you not know that a china amp is different than a north-american amp?
02:43 rue_house I think there is about a 30% difference
02:43 rue_house as such, if you take a part of china rated for 3A(china) and load it to 3A(north-america) it will blow up
03:49 Tom_itx rue_house, good lead screws use double roller bearings
09:54 erodeer Hello people
09:54 erodeer anyone wants to suggest some interesting automated industrial robots??
09:55 erodeer need to write a paper and wanted some alternative opinions
11:55 rue_bed ABB IRB1400
20:46 rue_shop2 hmmmmmmmmmmm
20:46 rue_shop2 I just heard the unmisatable sound of a capacitor venting somewhere
20:46 rue_shop2 but I cant tell where it came from...
21:18 rue_shop2 having to turn the design of the voltage regulator on its head to make it work
21:18 rue_shop2 when does an op-amp not equalize the votlage between its inputs when in closed loop?
21:18 rue_shop2 when its oscillating!
21:18 rue_shop2 there it is again
21:19 rue_shop2 if soemthing just lots 2 caps I should be able to smell it
21:20 Tom_itx on your power supply?
21:20 Tom_itx too much ripple?
21:20 rue_shop2 about 10V too much
21:21 rue_shop2 so I changed the design
21:21 rue_shop2 a few times
21:21 rue_shop2 I'm temp. building it with a linear regulator
21:21 rue_shop2 a P channel fet
21:26 rue_shop2 hmmm when it heats up the fet starts leaking like a siv
21:28 Hyratel http://www.carbuildersolutions.com/uk/control-cables
21:30 rue_shop2 ah, no I was up agsinst the limit on the op-amp again
21:30 rue_shop2 ooo
21:31 rue_shop2 bowden, I have to remmeber that nama
21:31 rue_shop2 e
21:31 rue_shop2 Hyratel, this is an awesome catalog of things I can make when I need them!
21:32 Hyratel http://www.carbuildersolutions.com/uk/bowden-cable-outer
21:40 Hyratel why am I only turning up bowden cable suppliers in the UK
21:41 Hyratel http://www.aircraftspruce.com/categories/aircraft_parts/ap/menus/ap/controls_ycable.html
21:46 rue_shop2 I'm a bit worried that my refernce signal is 0-2.5V and its controlling 0-30V output
21:47 rue_shop2 so, 1mv noise...
21:47 rue_shop2 is 12mv out
21:48 rue_shop2 I suppose thats ok
21:48 Hyratel what's the ref from?
21:48 rue_shop2 16 bit dac
21:53 rue_shop2 I thoguht it was 5V out, they make it 2.5V +-1.25V
21:54 rue_shop2 there it is again, maybe the battery I'm charging is farting
21:56 rue_shop2 keeping the loop gain down would be nice
21:58 rue_shop2 I suppose 12 isn't that bad
22:22 rue_shop2 dozing off again
23:17 mrdata join ##politics
23:17 mrdata oops
23:17 mrdata dont
23:47 MjrTom no you