#emc-devel | Logs for 2007-10-15

[00:02:57] <cradek> good evening
[00:04:09] <cradek> if cutting 1/4" steel plate with coolant on top of the cut, don't assume there's coolant at the bottom of the cut
[00:04:32] <jmkasunich> oops
[00:04:42] <cradek> the fireworks were neat
[00:04:45] <jmkasunich> wow
[00:04:56] <jmkasunich> you must have been using carbide?
[00:05:13] <cradek> nope just HSS
[00:05:23] <jmkasunich> what SFPM were you running?
[00:05:24] <cradek> it was fine when the coolant was right
[00:05:55] <jmkasunich> the speeds I use with HSS would give blue chips but not fireworks
[00:06:06] <cradek> about 200sfm
[00:06:49] <cradek> maybe it was a little more
[00:06:58] <cradek> not sure what the rpm is
[00:07:09] <cradek> it was a junk cutter anyway, no big deal
[00:07:16] <jmkasunich> what happened exactly?
[00:07:22] <jmkasunich> glowing chips?
[00:07:31] <cradek> yes
[00:08:04] <cradek> the tool is fine where it was at the top half of the cut, but burnt up (missing) at the bottom half where it didn't stay cool
[00:08:24] <jmkasunich> hard to believe it was just lack of coolant
[00:08:51] <cradek> it was .3" deep on .25" plate, so the points are still there but there's a notch missing on each flute, up a bit from the end
[00:09:03] <jmkasunich> you were milling along the edge?
[00:09:13] <cradek> no, through
[00:09:20] <cradek> along the edge it was fine
[00:09:35] <jmkasunich> through = along 2 edges at once ;-)
[00:09:47] <cradek> one BIG edge
[00:09:58] <jmkasunich> or did you have some kind of backing underneath that kept chips and coolant from flowing thru?
[00:10:13] <cradek> nope, nothing under it
[00:10:29] <jmkasunich> I could see milling 0.24 deep in a 0.25 plage being a problem, since the bottom of the slot is blind
[00:10:39] <cradek> the cutter may have been crap, it's unknown and marked china
[00:10:42] <jmkasunich> but if its a thru slot, why didn't stuff flow donw into it
[00:10:42] <jmkasunich> down
[00:10:55] <cradek> I guess I had it aimed wrong
[00:11:19] <cradek> may have been too low, and mostly hitting the plate and not the cutter
[00:13:13] <jmkasunich> jepler: you around?
[00:16:08] <cradek> I'm not used to dark at 7pm yet... it seems so late
[00:16:17] <cradek> any progress on your cnc conversion?
[00:16:23] <jmkasunich> sucks doesn't it
[00:16:26] <jmkasunich> no
[00:16:31] <cradek> yep, sucks.
[00:16:33] <jmkasunich> I went out shooting ducks today
[00:16:38] <cradek> but, we'll get used to it
[00:16:49] <cradek> do you eat ducks?
[00:16:58] <jmkasunich> shooting pixels
[00:17:20] <cradek> ?
[00:17:26] <cradek> oh a video game?
[00:18:32] <jmkasunich> http://jmkasunich.com/pics/wood-duck-male-1058.JPG
[00:18:49] <cradek> oh, I get it
[00:19:00] <cradek> that's good, because ducks are cool
[00:19:22] <cradek> wow you sure caught his colors
[00:19:56] <jmkasunich> I spent about 2-1/2 hours in the park today, shot a couple hundred pics
[00:20:06] <jmkasunich> sorting thru them now
[00:21:11] <jmkasunich> there were 6-8 _serious_ photographers shooting them too
[00:21:29] <jmkasunich> serious = lenses that cost as much as a nice used car
[00:22:13] <cradek> ha
[00:22:40] <jmkasunich> not snobby though (which was a bit of a surprise)
[00:22:54] <jmkasunich> got a bit of usefull advice from one of them
[00:23:08] <cradek> that is a little surprising
[00:24:02] <jmkasunich> it was
[00:24:25] <jmkasunich> the advice was - get as low as possible when shooting birds on water
[00:24:55] <cradek> that does sound like good advice, I never thought about it
[00:25:11] <jmkasunich> there's a footbridge over the pond, I was crouched down on it
[00:25:20] <jmkasunich> would up laying on my belly instead
[00:25:28] <DanielFalck> cradek: what was the steel like to begin with? was it saw cut?
[00:25:32] <jmkasunich> lens maybe 16" above the water
[00:25:56] <cradek> DanielFalck: CR bar, not cut
[00:26:24] <DanielFalck> so not flame cut or anything real rough
[00:26:27] <cradek> not sure if it was sheared off something
[00:26:29] <cradek> nope
[00:26:34] <DanielFalck> that's good
[00:26:40] <jmkasunich> and not hot rolled with scale
[00:29:56] <DanielFalck> cradek: your sfm might have been too high for HSS. I'm seeing around 110 fpm in a table I have here
[00:30:11] <DanielFalck> for plain carbon steel
[00:30:14] <jmkasunich> http://jmkasunich.com/pics/mallard-head-1109.JPG
[00:30:35] <jmkasunich> I usually use 100 fpm for HSS on steel
[00:30:49] <cradek> DanielFalck: yeah it was too high. I switched from 375 to 625 endmill and didn't reduce the rpm
[00:30:54] <DanielFalck> moltrecht 'machine shop practice vol 2'
[00:31:35] <cradek> I have been looking for a wall chart that has all those magic numbers
[00:31:50] <cradek> if it would show dia vs rpm, even better
[00:32:17] <DanielFalck> http://its.fvtc.edu/MachShop3/SpeedCalc/feedratecalc.htm
[00:32:31] <jmkasunich> if you're mostly using HSS, there are only a few surface speeds to remember
[00:32:43] <jmkasunich> 100 = HSS on (mild) steel
[00:32:57] <cradek> jmkasunich: I use some carbide too, but that's easy, maybe 3x the hss value
[00:33:04] <jmkasunich> 200 = HSS on aluminum (can sometimes go a bit higher)
[00:33:12] <jmkasunich> 50 = HSS on tough steel
[00:33:23] <DanielFalck> this one's a better chart than the last:
[00:33:24] <DanielFalck> http://its.fvtc.edu/MachShop3/SpeedCalc/SpeedRPM.htm
[00:33:29] <jmkasunich> its not like you're trying to shave a few seconds/pennies off of each part
[00:35:01] <DanielFalck> wikipedia:
[00:35:06] <DanielFalck> http://en.wikipedia.org/wiki/Cutting_speed
[00:35:53] <jmkasunich> drat - got a beautiful pic of a male wood duck, with his reflection in the water
[00:35:53] <DanielFalck> I know what I can program for you for Christmas now : )
[00:36:15] <jmkasunich> but the head is missing from the reflection - I framed it poorly
[00:36:31] <cradek> ah, darn
[00:36:53] <jmkasunich> lol, caught another one scratching his chin with his foot
[00:38:07] <cradek> thanks guys, I'll remember 100 and 250
[00:38:53] <jmkasunich> its trivial to make a spreadsheet with cutter dia in one column, and three more columns with the RPM for 50, 100, and 250 SFPM
[00:38:59] <jmkasunich> print and hang
[00:39:45] <jmkasunich> http://jmkasunich.com/pics/wood-duck-scratching-1118.JPG
[00:42:43] <jmkasunich> http://jmkasunich.com/pics/wood-duck-flapping-1136.JPG
[00:44:37] <cradek> seems like I could make a graph with rpm vs dia. a particular SFM would be a diagonal line on it
[00:44:49] <cradek> it could be that log/log would be best
[00:44:59] <jmkasunich> yep, I've seen charts like that
[00:46:09] <cradek> I have no idea what software to use to make that :-/
[00:46:35] <DanielFalck> tkinter of course!
[00:46:38] <jmkasunich> thats why I've just done the spreadsheet one
[00:46:51] <cradek> DanielFalck: autocad!
[00:46:55] <fenn> gnuplot
[00:47:31] <cradek> fenn: I was afraid of that
[00:48:26] <DanielFalck> use Axis and write a gcode program to engrave the numbers and the graph
[00:49:00] <DanielFalck> using apt360 to generate the g-code of course : )
[00:49:01] <jmkasunich> I wish all the shots were focused this well: http://jmkasunich.com/pics/duckeye-1149.JPG
[00:49:10] <jmkasunich> you can see the railing of the footbridge reflected in its eye
[00:51:14] <cradek> jmkasunich: you must have a lot of pixels...
[00:51:22] <jmkasunich> 10M
[00:51:29] <DanielFalck> nice phots
[00:51:33] <DanielFalck> photos
[00:51:33] <jmkasunich> bout the same as Jeff's camera I think
[00:51:51] <jmkasunich> I'm only showing you guys the good ones
[00:52:42] <jmkasunich> nice thing about digital is that you can throw away a hundred and not waste money
[00:52:52] <cradek> yep
[00:53:06] <cradek> best thing to happen to photography since ... ?
[01:06:18] <fenn> well this isnt too hard: import Gnuplot; g = Gnuplot.Gnuplot(); g.plot(Gnuplot.Func('x**2'))
[01:06:45] <cradek> fenn: I've mostly got it, just trying to get the labels I want, etc
[01:07:19] <fenn> i was messing around trying to figure out why i couldnt do 'from Gnuplot import *'
[01:08:18] <fenn> "because the module and the main class have the same name"
[01:08:22] <fenn> d'eaux!
[01:08:39] <fenn> they should make the module lowercase then
[01:15:53] <jepler> jmkasunich: just saw your photos .. nice
[01:17:14] <jepler> bbl
[01:17:29] <SWPadnos> make M3.1 be "set spindle speed in SFM for the current tool"
[01:17:37] <SWPadnos> or S3.1 or whatever
[01:18:01] <SWPadnos> no, wait - you know what I mean (even if I don't)
[01:53:38] <jepler> * jepler remembers to try his "developer edition" CD .. and it is finally getting to the live cd desktop..
[02:03:16] <jmkasunich> jepler: did you see my macro shot? http://jmkasunich.com/pics/duckeye-1149.JPG
[02:03:30] <jepler> jmkasunich: yeah
[02:04:50] <jepler> though I think the composition of the other shots was better :-P
[02:05:03] <jmkasunich> heh
[02:06:29] <jepler> here's my favorite recent image (or remove -medium for more pixels): http://emergent.unpy.net/files/sandbox/img_7102-medium.jpg
[02:07:39] <jmkasunich> neat
[02:07:52] <jmkasunich> thats with the ring flash and natural light?
[02:08:08] <jepler> if it was with any flash, it was the built-in flash
[02:08:55] <jepler> EXIF Flash (Short): No
[02:09:12] <jmkasunich> must have just been good light then
[02:09:14] <jepler> I guess
[02:09:27] <jmkasunich> the smaller (farther away) bug is well lit for being under the flower
[02:09:28] <jepler> I barely remembered shooting this particular image, so I don't know what I "did"
[02:10:02] <jepler> which is too bad because obviously I did something right
[02:11:20] <jmkasunich> today was duck day, but one of my favorites from today isn't a duck or even a bird
[02:11:20] <jmkasunich> http://jmkasunich.com/pics/waterfall-leaves-0977m.JPG
[02:12:40] <jepler> yeah I like flowing water photos
[02:14:59] <jmkasunich> couple other water photos from a couple weeks ago:
[02:15:00] <jmkasunich> http://jmkasunich.com/pics/sunset-wave-0925m.JPG
[02:15:08] <jmkasunich> http://jmkasunich.com/pics/rock-waves-0949m.JPG
[02:15:52] <jmkasunich> that was a windy evening
[02:16:23] <jmkasunich> not as windy as this evening tho: http://jmkasunich.com/pics/waves-0759.JPG
[02:16:33] <jmkasunich> http://jmkasunich.com/pics/waves-0767.JPG
[02:16:46] <jepler> any idea what the blue thing is on the rocks in rock-waves ?
[02:17:24] <jmkasunich> no
[02:17:28] <jmkasunich> probably trash
[02:17:46] <jmkasunich> this is only a few miles east of downtown cleveland
[02:18:15] <jmkasunich> the sand on the beach has all kinds of crap in it
[02:18:37] <jepler> ah
[02:19:36] <jepler> http://emergent.unpy.net/index.cgi-files/sandbox/img_7687-medium.jpg -- near denver a few weeks ago
[02:19:39] <jmkasunich> unfortunately parts of the sewer system are still very old, and when a storm hits, rainwater overflows the storm sewers into the sanitary sewers, which overloads the treatment plant and winds up overflowing untreated stuff into the lake
[02:20:03] <jmkasunich> ohh, pretty
[02:20:34] <jmkasunich> leaf season is coming soon here
[04:11:22] <steves_logging> steves_logging is now known as stevestallings
[05:01:04] <stevestallings> stevestallings is now known as steves_logging
[14:09:53] <Guest635> Guest635 is now known as skunkworks
[14:38:34] <skunkworks> logger_dev: bookmark
[14:38:34] <skunkworks> Just this once .. here's the log: http://www.linuxcnc.org/irc/irc.freenode.net:6667/emcdevel/2007-10-15.txt
[17:12:45] <Guest233> Guest233 is now known as skunkworks
[18:55:53] <skunkworks> SWPadnos: laser is working great. Now I need to mount it on my telescope.
[18:56:10] <SWPadnos> cool
[18:56:33] <skunkworks> the beam seems pretty tight also.
[18:56:34] <SWPadnos> if you have night vision goggles, laser pointers are even more fun
[18:56:44] <SWPadnos> you can see the point several miles away
[20:22:14] <alex_joni> http://www.linuxcnc.org/c_f/
[20:22:57] <skunkworks> sweeeet :)
[20:24:01] <alex_joni> now, then next thing will be to make the page resizable
[20:24:07] <alex_joni> not fixed-width
[20:25:33] <alex_joni> SWPadnos: around?
[20:29:09] <SWPadnos> sorta
[20:35:01] <jepler> in the 'stylish' extension for firefox, this widens the page to 100% browser width: http://pastebin.ca/737895
[20:35:52] <alex_joni> jepler: was thinking about fixing it right
[20:36:08] <alex_joni> (e.g. new/modified template)
[20:45:51] <jepler> or if you prefer a little space at the edges: #main { width: auto !important; margin-left: 10ex; margin-right: 10ex;}
[20:46:25] <jepler> I am not saying everyone should install an extension to tweak the linuxcnc layout .. but that maybe a few small modifications to the current css suffice
[20:48:18] <alex_joni> right
[20:51:19] <alex_joni> * alex_joni goes to bed
[20:51:21] <alex_joni> good night all
[20:51:28] <jepler> see you