#robotics Logs

Apr 11 2014

09:01 rue_more 10 Apr 20:31:00 ntpdate[14309]: step time server 206.108.0.132 offset 327033671.748713 sec
09:08 rue_more 10 years out
11:22 cinvoke anyone in here ever recover from some type of ROM flashing failure?
11:24 robopal have you asked in ##electronics?
11:24 robopal (more people, more people active, better odds)
11:27 cinvoke robopal nope. thanks!
13:35 SlaveToTheSauce https://www.youtube.com/watch?v=0lHltWN_RgY
13:35 SlaveToTheSauce man i wish mecanum wheels weren't so expensive
13:41 Hyratel you could use Omni wheels in an X configuration
13:42 SlaveToTheSauce yeah i know
13:42 SlaveToTheSauce they're definitely not as cool though!
13:43 SlaveToTheSauce (and not all that much cheaper really)
23:04 rue_bed a steam engine running at 3600 rpm, with a 10cm crank, with a 10cm dia piston, takes about 5 psi to output 10kw
23:08 rue_bed 1570cc
23:09 Jak_o_Shadows Do steam engines do the regular cams to let in steam and exhaust it?
23:10 GargantuaSauce the ports need to have pretty big cross sections so they usually have big slidey valves
23:10 rue_bed 5.7m^3 of steam/min
23:10 GargantuaSauce sort of a like a 2 cycle engine
23:11 GargantuaSauce but a separate slidey bit from the piston
23:12 rue_bed 1:1700
23:12 rue_bed 3.9 liters of water boiled/min
23:12 GargantuaSauce so i guess my shitty hexapod is going to end up on hackaday.
23:12 rue_bed :) sweet!
23:15 GargantuaSauce are closed steam systems ever used for reciprocating steam engines?
23:15 rue_bed in modern stuff
23:15 rue_bed means the water is just under vap temp going in!
23:16 rue_bed and a condensing chamber causes a vacume on the engine exhaust
23:16 GargantuaSauce well ok, are there modern reciprocating steam engines or are they always turbines
23:16 rue_bed so your DIFF pressure needs to be 5psi, not absolute pressure
23:16 rue_bed I think its all turbine now
23:19 rue_bed the temp difference can come from the boiler and go into the house
23:21 Jak_o_Shadows Generally you avoid a phase change across the turbine.
23:21 GargantuaSauce yeah i can see that being bad.
23:21 rue_bed yea, you have a conderser after
23:22 Jak_o_Shadows Gotta reject heat somewhere.
23:23 Jak_o_Shadows Phase change isn't bad from basic thermodynamics, but it's bad when you get to the real world
23:23 rue_bed it starts to become a stirrling engine
23:23 rue_bed yea, the condensor tank
23:23 rue_bed a tank where the steam cools to turn back into water, in the process developing a vacuum
23:24 rue_bed of 1700:1
23:38 Jak_o_Shadows oh yuck, you use imperial units don't you.
23:42 GargantuaSauce looks like a delicious mix to me
23:42 GargantuaSauce psi, L, m^3
23:43 Jak_o_Shadows the only ugly bit there is psi
23:43 Jak_o_Shadows slugs/pound mass/pound force suck
23:49 rue_more its a real number to me
23:49 rue_more I know I can almost blow that hard
23:49 rue_more http://paste.debian.net/93299/
23:51 rue_more its from my library that simplifies serial communication on linux
23:59 GargantuaSauce i hate serial comms in linux so much
23:59 GargantuaSauce if you want a custom bitrate aka anything over 500-whatever kbaud you have to alias one of the other baud rates