#garfield Logs

Jul 25 2021

12:19 AM rue_mohr: so, I need to work out how to calculate toque generated by a crank
12:26 AM rue_mohr: seems logical it would be a sine wave
12:26 AM rue_mohr: er technically cosine I suppose
12:28 AM rue_shop3: ok! this version of the bearing holders works!
12:30 AM rue_shop3: a buddy said he was comming over today and would pick up the cylinder hone I ordered, but he didn't come over
02:11 AM rue_mohr: so
02:11 AM rue_mohr: the numbers come out crazy
02:11 AM rue_mohr: for 2HP
02:11 AM rue_mohr: 900 rpm
02:11 AM rue_mohr: the crank is .55 radius offset
02:11 AM rue_mohr: and the piston is shy of 3cm dia
02:12 AM rue_mohr: 200.000000 psi operating pressure
02:12 AM rue_mohr: 2.000000 HP
02:12 AM rue_mohr: 900.000000 RPM
02:12 AM rue_mohr: 2.000000 cylinders
02:12 AM rue_mohr: 0.550000 inch crank radius
02:12 AM rue_mohr: ------------------------
02:12 AM rue_mohr: 1.081546 liters/sec steam by power
02:12 AM rue_mohr: 64.892772 liters/min steam by power
02:13 AM rue_mohr: 11.671362 foot*lbs torque by power
02:13 AM rue_mohr: 0.072103 liters/rev steam per rotation
02:13 AM rue_mohr: 72.103080 cc steam per rotation
02:13 AM rue_mohr: 18.025770 cc cylinder size
02:13 AM rue_mohr: >>>>>> 2.866083 cm piston diameter
02:13 AM rue_mohr: 9.168392 foot*lbs peak per cylinder
02:13 AM rue_mohr: 200.037634 lbs peak cylinder force
02:13 AM rue_mohr: 0.999812 inches^2 minimum piston area
02:13 AM rue_mohr: >>>>>> 2.865813 cm minimum piston diameter
02:50 PM Tom_L: cpld controlled steam engine
03:34 PM rue_mohr: :)
03:38 PM polprog: im back
03:38 PM polprog: i started taking the printer apart
03:38 PM polprog: ill upload pics in a moment
03:39 PM polprog: color laser
03:40 PM polprog: 4 laser imager units, 6 motors with integrated drivers
03:40 PM polprog: beefy power supply
03:46 PM rue_shop2: xilinx cpld/fpga?
03:47 PM polprog: no, custom part#s and only a lattice IC
03:49 PM rue_mohr: ok, so how baout unmarked 6 pin headers by the lattice chip?
03:50 PM rue_mohr: or 10, sometimes jtag is 10
03:50 PM rue_mohr: arm or mips, probably mips
03:50 PM rue_mohr: runs a linux core
03:51 PM rue_mohr: compressed images in rom
03:51 PM rue_mohr: they get extrated to ram
03:51 PM polprog: there is a 10 pin header
03:51 PM polprog: its a 2000 era lexmark
03:51 PM rue_mohr: k, find the vcc and gnd pins
03:51 PM polprog: uploading pics
03:51 PM rue_mohr: :)
03:51 PM polprog: I cant do it now
03:51 PM polprog: its in the basement
03:51 PM rue_mohr: you do want to turn it into a hapless network appliance, right?
03:52 PM polprog: i was hoping to get the optics running
03:56 PM polprog: https://polprog.net/rozne1/ircjunk/lexmark/
03:56 PM polprog: got slide running there
03:56 PM polprog: also
03:57 PM polprog: https://polprog.net/rozne1/ircjunk/lexmark/mainboard.jpg hi res
03:59 PM polprog: ill take a better photo tomorrow
04:11 PM polprog: The motors have printed windings, the metal part is the rotor
04:11 PM polprog: the windings are done in PCB
04:12 PM rue_shop2: I really need to get more ram into this thing
04:12 PM polprog: the shop pc
04:13 PM rue_shop2: one of
04:13 PM polprog: the one that runs rue_shop2's mind
04:13 PM Tom_L: pfft
04:13 PM Tom_L: arduino would do
04:13 PM polprog: try to get rue_bed to cram some into you
04:13 PM Tom_L: :)
04:13 PM polprog: :)
04:13 PM polprog: rue net
04:13 PM rue_shop2: it didn't have a ram card?
04:13 PM polprog: nope
04:13 PM rue_shop2: where is the slideshow
04:13 PM rue_shop2: there we
04:13 PM rue_shop2: are
04:14 PM polprog: you like the slideshows
04:14 PM polprog: i like them too actually. def better than bare listing
04:14 PM rue_shop2: if you can still power it, capture the serial to that screen/keyboard
04:14 PM polprog: i could power it, i have the power supply
04:14 PM polprog: I just took it all apart
04:14 PM polprog: yeah the screen could be nice
04:14 PM rue_shop2: its a programmed controller
04:15 PM rue_shop2: no idea what the protocol is
04:15 PM rue_shop2: but its probably simple serial
04:15 PM rue_shop2: if you just capture it...
04:15 PM polprog: there were four wires
04:16 PM rue_shop2: the toner is messy as all hell, bag it up good
04:16 PM polprog: four! a ha ha ha ha
04:16 PM polprog: Yes, i havent gotten up to the waste container yet
04:17 PM rue_shop2: I suppose you dont have a reader for that rom eh?
04:17 PM rue_shop2: they have gzipped software images
04:18 PM rue_shop2: hey, there is a 6 pin header
04:18 PM rue_shop2: by the PMC chip, unpopulated
04:31 PM polprog: which rom? the tssop one?
04:31 PM polprog: K9F280xxx?
04:32 PM polprog: i have an adapter but i think my minipro does not support it
05:03 PM rue_mohr: I got the adatper
05:03 PM rue_mohr: whats the pn?
05:04 PM polprog: K9F2808UOC
05:04 PM rue_mohr: K9F2808U0A@TSOP48
05:04 PM rue_mohr: K9F2808U0B@TSOP48
05:04 PM rue_mohr: K9F2808U0C@TSOP48
05:04 PM rue_mohr: K9F2808U0M@TSOP48
05:04 PM polprog: hmm
05:04 PM rue_mohr: it does
05:04 PM rue_mohr: problem would be getting it off and back on again
05:04 PM polprog: Oh, i havent tested with the linux program
05:05 PM polprog: it was long time ago
05:05 PM rue_mohr: I have some printer controllers but have not tired it yet
05:05 PM rue_mohr: but I had one with the rom from CF
05:05 PM rue_mohr: 32M card
05:05 PM rue_mohr: so I may play with that
05:20 PM rue_shop2: I think I tried to do something about the ram in this machine before and I couldn't
05:20 PM rue_shop2: its udner the 3d printer so its a lot of trouble to work on
05:21 PM Tom_L: is that your webpack pc?
05:21 PM Tom_L: it's hungry
05:22 PM rue_shop2: time to cycle the browser
05:28 PM rue_shop2: 2691040 252972 111024
05:29 PM rue_shop2: firefox is just sitting there with a 'recover tabs' session, lets see if its memory slowly creaps up
05:33 PM polprog: hmm
05:33 PM polprog: webpack?
05:35 PM rue_shop2: for the cpld/fpga
05:35 PM rue_shop2: its a memory monster
05:36 PM rue_shop2: 2804332 256120 115576
05:36 PM polprog: ah ISE and the like
05:36 PM rue_shop2: yup
05:36 PM rue_shop2: yea, just sitting there, mozilla is leaking memory
05:46 PM Tom_L: put a bucket under it
05:48 PM rue_mohr: I dont have room for one large enough
06:11 PM polprog: my jlink is already in the country
06:11 PM polprog: just need the customs to clear and ill have it ^^
06:34 PM rue_shop2: :/
06:34 PM rue_shop2: ft232h?
07:36 PM polprog: i have one
07:36 PM polprog: i just wanted a jlink to have more
07:37 PM polprog: i should have bought another ft232hq as well
07:37 PM polprog: :/
07:50 PM polprog: gn
08:36 PM rue_mohr: gnight
08:36 PM Tom_L: oh
08:36 PM Tom_L: i thought _you_ were
08:59 PM Tom_L: looks like a .125 cutter would _just_ fit on those lobes
09:15 PM rue_shop3: ok
09:15 PM Tom_L: i saved that as iges
09:15 PM Tom_L: imported it in the new and old versions
09:15 PM Tom_L: the old version did a much better job again
09:24 PM Tom_L: no, a 1/16 cutter
09:24 PM Tom_L: odd, the scale came in right on that
09:25 PM Tom_L: oh i know why
09:25 PM Tom_L: because i did the iges from an imperial catia file
09:40 PM Tom_L: rue_shop3, how did the one you printed fit?
10:07 PM rue_shop3: good
10:07 PM rue_shop3: not tight or overly loose
10:07 PM rue_shop3: but the printer fuzzes out the sides a bit
10:07 PM rue_shop3: you can see it on the stuff I sent you
10:08 PM rue_shop3: the layers have some jitter
10:09 PM Tom_L: so the dimensions are ok
10:09 PM Tom_L: as far as a working part
10:15 PM rue_mohr: cool
10:15 PM rue_mohr: yes
10:15 PM rue_mohr: I mean, sorry
10:15 PM rue_mohr: been distracted
10:15 PM rue_mohr: mostly doing yard cleanup today
10:16 PM rue_mohr: I have the scrap metal and the old batteries loaded into the truck to take in to the scrap metal place when I go to pick up the motorbike engine
10:19 PM Tom_L: i'm not sure i have cutters long enough but i remembered i've got some 1" alum roundbar
10:20 PM Tom_L: from the tool holders i was making
11:15 PM rue_shop3: heh, you pondering doing that in alum?
11:16 PM rue_shop3: we should find a steam engine design and set you up to make one part at a time when your borred
11:49 PM rue_shop3: I was going to see if one of the hard drive controllers has a 3.3V regulator system I can scoop for the bga board
11:49 PM rue_shop3: its got 5 switching converters on it...
11:49 PM rue_shop3: I wonder how I can work out who is who