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[00:11:37] <skunkworks___> http://www.youtube.com/watch?v=PdrqdW4Miao
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[00:17:51] <andypugh> Wow! Love it.
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[00:46:28] <JT-Shop> Tom_itx:
http://www.youtube.com/watch?v=wfmvkO5x6Ng
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[01:31:47] <L33TG33KG34R> so
[01:32:19] <L33TG33KG34R> http://www.leetgeekgear.ca/IMAGES/GDADAHRS/EDF%20thrust%20Pitot-Static%20Tube.png and
http://www.leetgeekgear.ca/IMAGES/GDADAHRS/EDF%20thrust%20pitot-static%20tube%201.png is what I have so far. what do you guys think?
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[01:40:25] <mikegg> cool, whats the application?
[01:42:42] <toastyde1th> how are you going to make it
[02:03:46] <mikegg> is PCW lurking?
[02:04:19] <mikegg> I'm wondering If I could drive two of these
http://servo2go.com/support/downloads/AB34000.pdf with a 7i39
[02:05:16] <mikegg> right now I'm driving them at line voltage and the speed is ample. I don't think it would be a problem to cut the speed in half
[02:06:35] <mikegg> the 8i20 is tempting, but I will never need to drive them at 325VDC
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[03:44:54] <L33TG33KG34R> its going to be 3d printed from ponoko. its a pitot-static tube for measuring airspeed
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[07:02:41] <The_Ball> Does Dewey Garrett hang around here?
[07:04:39] <awallin_> very windows-ish background/desktop on this one ??
http://hackaday.com/2011/06/16/tripod-cnc-plotter/
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[13:24:30] <skunkworks_> http://cnczone.com/forums/emc_linux_enhanced_machine_control/130342-mori_mv_35_40_retrofit.html\
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[13:46:17] <skunkworks_> so - does anyone know how they machine a valve stem to accept a valve?
[13:47:11] <archivist_emc> er arse about face, can you improve the question
[13:47:35] <skunkworks_> heh
[13:48:11] <archivist_emc> did you spot the spam retrofit advert at the bottom of that cnczone page
[13:48:14] <skunkworks_> tire valve stem - for filling them. I think I can use the actual valve assembly as a snifter valve.
[13:48:19] <skunkworks_> archivist_emc: yes
[13:48:21] <skunkworks_> sadd
[13:48:23] <skunkworks_> sad
[13:48:53] <skunkworks_> I suppose that doesn't make much more sense...
[13:49:27] <archivist_emc> looked like indians, but site and address is chinese
[13:53:41] <skunkworks_> these valves
[13:53:42] <skunkworks_> http://www.amazon.com/Slime-20088-4-Way-Tool-Valve/dp/B0020T17J2%3FSubscriptionId%3DAKIAIRRBQMN4FFDY2U7Q%26tag%3Dnileprops-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB0020T17J2?__router=6jbfs6bam8nd5k2p2dimh99281
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[13:55:12] <archivist_emc> I see a blister pack with standard tire valves
[13:55:43] <skunkworks_> hmm - kinda looks like it is just 2 different size holes. the tap size hole and then a smaller hole that creates the ledge that the valve seals on
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[13:56:35] <skunkworks_> I got some of the same stye valves - but they seem to have a very very weak spring in them - I can blow air through them.
[13:57:17] <archivist_emc> the internal pressure is the main closing force probably
[13:57:50] <skunkworks_> sure - I need them to equalize the cylinder and crank case pressure of my stirling engine.
[13:58:21] <archivist_emc> I probably have the SAE drawing/standard here
[13:58:49] <archivist_emc> hmm stirling...I want
[14:07:44] <archivist_emc> was IAE notSAE and not enough info and one of the needed standards is missing here
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[14:20:16] <Guest84334> Never used IRC before. alright, I've got a problem with EMC2. the mayor part is working as it should be, but I can't get the limit and homing switches to work. emc2 doesn't respond to them. so, I downloaded the paralell port test program (with which I can monitor the inputs and outputs of the parallel port, and it turns out my pc doesn't respond to the inputs at all! I can activate some outputs, turn for example the spindle on, but the inputs al
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[14:21:50] <jdhNC> are they wired correctly?
[14:23:44] <Guest84334> yes, if I use a multimeter to check the inputs (I measure the pins on the cable, without a PC connected), then I can see the switches toggle. but the PC doesn't see it!
[14:24:22] <archivist_emc> have you got a pull up to 5v
[14:24:26] <jdhNC> you are seeing 5V go high/low, not just conductivity?
[14:24:42] <Guest84334> yes, I see 5V/0V
[14:25:04] <archivist_emc> have you set that pin as an input
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[14:26:24] <Guest84334> almost forgot to tell: Mach3 on windows has the exact same problem on this PC, so it should be a hardware/BIOS problem. archivist, how do you mean? aren't parallel pins fixed to input/output, or can I change it somewhere?
[14:29:52] <archivist_emc> you do need to configure which are in and which are output pins have you looked at stepconf
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[14:31:25] <Guest84334> yes, but that is the software setting, where you assign a function to an input/output. I have assigned the inputs to the corresponding limit switch functions, but even with an external program (the port tester), I don't see any activity on the inputs.
[14:37:55] <archivist_emc> have you seen
http://www.linuxcnc.org/docview/html/hal_parallel_port.html
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[14:43:28] <Guest84334> thanks, I'm looking into it now
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[14:51:42] <syyl> moin
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[15:38:42] <FinboySlick> How much does chip load and fsm(?) vary between carbide endmills? I have a few AlTiN ones with no clue who the manufacturer is and I'd like to avoid ruining them.
[15:39:50] <FinboySlick> I found pretty charts from Niagara cutters that match mine, but I think those are pretty fancy and might be much better than my cheap stuff.
[15:40:28] <archivist_emc> I think you have to read the real spec for an insert to know its geometry and purpose
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[15:41:40] <FinboySlick> archivist_emc: Yeah, that's sort of what I expected. There's a big USA on the side of the cutter... Is that a brand?
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[15:42:03] <archivist_emc> not one I know
[15:42:14] <ssi> FinboySlick: is it a big pro machine or a home machine
[15:42:38] <FinboySlick> ssi: It's a somewhat fancy 'home' machine.
[15:43:16] <ssi> you likely can't run it hard enough to ruin it (other than flat breaking it)
[15:43:23] <ssi> but you can run it SLOW enough to ruin it :P
[15:43:32] <FinboySlick> I wouldn't worry too much for conventional spindle speeds, but this thing won't go lower than 8000 rpm. So I can't just go slow and careful.
[15:43:51] <ssi> hrm
[15:44:16] <FinboySlick> It can move pretty fast.
[15:44:22] <archivist_emc> your cooling can crack the cutters, can be better off dry
[15:44:31] <FinboySlick> Yeah, that's what I'm planning.
[15:45:54] <FinboySlick> I plan on taking light cuts too, but I don't want to just wear the cutter instead of the part so finding that sweet spot between going too slow and going too fast is a bit of an insecurity for me. Lack of experience is making me pretty insecure.
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[15:47:39] <Jymmm> Eh, you're still green till you've broken a cutter. Just avoid running a cutter into the table =)
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[15:48:50] <FinboySlick> I've also been told I ought to be pretty careful with aluminium because it sticks.
[15:49:20] <FinboySlick> (that and stainless apparently)
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[15:50:27] <Jymmm> Just be aware that aluminum can be sticky. And SS can just be a bitch!
[15:55:07] <JT-Shop> if you take light cuts at 8k you might not remove enough material to pull the heat out and real fast your cutter will be gummed up with melted aluminum
[15:55:09] * FinboySlick goes to buy a face shield and first aid kit ;)
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[15:58:16] <JT-Shop> the carbide endmills I use for a 3/8" diameter two flute one at 8000rpm would be 80 IPM and have 785 SFM
[15:59:10] <JT-Shop> and the same endmill will go 20,000 rpm @ 200 IPM
[15:59:18] <FinboySlick> I'm limited to 1/4" maximum size but your previous statement makes me understand why sometimes less flutes is better.
[15:59:21] <JT-Shop> YMMV
[16:00:34] <JT-Shop> a 1/4" will go up to 30,000 RPM @ 300 IPM to get the SFM up to max of 2000
[16:01:17] <JT-Shop> the same endmill with 4 flutes will have to go 600IPM to have the same chip load
[16:02:05] <FinboySlick> JT-Shop: Wow... I don't think my mill can move that fast (reliably) with steppers.
[16:02:53] <JT-Shop> a 1/4" 2 flute at 8000 RPM shows 48 IPM and 524 SFM
[16:03:03] <JT-Shop> with a chip load of 0.003"
[16:03:33] <JT-Shop> the 30k example is flawed as I left the chip load for 3/8"
[16:03:43] <FinboySlick> Ok.
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[16:03:58] <FinboySlick> I'll try to figure all of this out, now I'm being called out for lunch.
[16:04:01] <FinboySlick> Thanks :)
[16:04:11] <JT-Shop> ok, I have a spreadsheet if you like
[16:07:50] <alex4nder> JT-Shop: what kind of machines do you use/own?
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[16:22:48] <JT-Shop> I own a small VMC, a Hardinge Chucker lathe, BP Series 1 with Anilam 3 axis CNC conversion, a CNC plasma cutter (my design), a Samson 14x40 manual lathe, and last but not least my Enco manual mill
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[16:24:23] <Tom_itx> skunkworks, i think the seal on those is all in the valve assembly. You probably just need to thread the inside of the tube for it
[16:25:03] <Tom_itx> i used to machine check valves and you need a leakage tester to make sure they seal properly
[16:29:53] <Tom_itx> it was actually a 2 part valve one side had the check ball and the other side had a screw tight seat
[16:30:45] <skunkworks_> looks like all I need is a 2 step hole - the thread size hole and then a smaller hole that the seal tightens against
[16:31:25] <Tom_itx> we used a flat flute drill to cut the seats
[16:31:55] <skunkworks_> the seal area is tapered
[16:32:26] <Tom_itx> i'm sure most of you have either used or seen the product. I made the pump base and valve for the coleman 220 lantern amongst other things
[16:32:46] <Tom_itx> did some things for the propane line as well
[16:32:58] <Tom_itx> that was years ago though
[16:33:20] <Tom_itx> do you need alot of them?
[16:33:33] <Tom_itx> i'd get a drill ground for the whole thing
[16:35:53] <skunkworks_> well - I bought 50 - I need about 8 in the engine ;)
[16:36:21] <Tom_itx> oh, this is that sterling engine project?
[16:37:40] <skunkworks_> yes
[16:56:06] <ssi> I need to fire up my plasma cutter this wkd
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[17:25:11] <skunkworks_> http://www.electronicsam.com/images/IMG_1703.JPG
[17:25:17] <skunkworks_> easy enough
[17:27:36] <ssi> cute
[17:29:14] <FinboySlick> skunkworks: Is it a wood grain optical illusion or does this look crooked?
[17:29:48] <skunkworks_> must be an illusion
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[18:02:48] <Jymmm> LOL (work safe)
http://bitsandpieces.us/wp-content/uploads/2011/06/imagessunbathe-nude.jpeg
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[18:38:10] <ve7it> Jymmm, is there a mens version?
[18:43:49] <Jymmm> ROTFLMAO
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[19:38:55] <skunkworks_> JT-Shop: I sent you an email!
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[19:52:25] <Aero-Tec> yo
[19:53:17] <Aero-Tec> so the IBM computer that was doing around 35K jitter is now at a tad over 10K
[19:53:33] <Aero-Tec> will use 12K for safety
[19:53:54] <Aero-Tec> all it needed was a BIOs setting changed
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[19:56:12] <JT-Shop> YEA!
[19:56:32] <cradek> what specifically did you change?
[19:57:18] <skunkworks_> I would guess though that 12k (if your going to use that for your base period) is too low. I would figure out what actual step rate you need an set the base period acordingly.
[19:57:22] <Aero-Tec> not exactly sure
[19:57:33] <Aero-Tec> made 3 maybe 4 changes
[19:58:31] <Aero-Tec> so what is channel spamming
[19:58:49] <cradek> pasting more than about 3 lines of text
[19:59:01] <Aero-Tec> I see others apologizing for doing it
[19:59:23] <cradek> typically we use a pastebin service when we have more than about 3 lines of text to share
[19:59:34] <cradek> otherwise it's obnoxious :-)
[19:59:35] <Aero-Tec> so 3 posts in a row and your spamming?
[19:59:39] <cradek> it's easy to do it mistakenly
[19:59:57] <cradek> anything you type is ok - this is talking about cut/paste big stuff
[20:00:04] <Aero-Tec> or one post with 3 lines of text?
[20:00:10] <Aero-Tec> ok
[20:00:37] <cradek> you'd have to type much faster than normal to get yelled at for spamming if it's just conversation
[20:01:01] <cradek> but with a program listing or error message, it's very easy to be accidentally obnoxious
[20:01:46] <Aero-Tec> as for the bios setting they were more specific to this machine as I have not seen them in other machines
[20:02:28] <Aero-Tec> I would have to reboot and look at the bios to see what they were
[20:03:26] <Aero-Tec> I am just happy that I got it down
[20:04:29] <Aero-Tec> skunkworks you say I should use use a higher number
[20:05:33] <Aero-Tec> I have a lathe and it has servos, I would like rapids to be as fast as possible, what sort of math should I be using?
[20:06:08] <Aero-Tec> what sorts of numbers do you use for jitter?
[20:11:17] <mikegg> timing requirements for servo systems are not as strict. strike a balance between your PC's performance and how often you think you need to do PID calculations
[20:12:12] <mikegg> ..if that helps
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[20:28:17] <Aero-Tec> what happens if you set it to say 10K and you get a 35K jitter?
[20:28:32] <Aero-Tec> crash and burn?
[20:29:11] <cradek> your step pulse timing will be poor when that happens
[20:29:12] <skunkworks_> realtime delays
[20:29:30] <cradek> that can sometimes cause a motor to stall because of its physical limitations
[20:32:26] <archivist_emc> even on servos ?
[20:32:44] <skunkworks_> I bet these are step-servos
[20:33:18] <skunkworks_> so they may error if the step change is higher than the servo/drive can handle
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[20:36:22] <mikegg> I still have my servo thread set to 100K. what are you guys running?
[20:36:45] <cradek> do you mean 1M?
[20:37:03] <mikegg> hmm, that's possible
[20:37:06] <cradek> 1 000 000 is the normal setting and I think that's what all my machines use
[20:37:33] <mikegg> that sounds right, we're talking nanosecond, right?
[20:37:39] <cradek> yes
[20:37:46] <cradek> no, usec
[20:37:59] <cradek> 1 millisec is the normal setting
[20:38:37] <cradek> er you're right, nanosec
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[22:03:42] <ds3> has anyone tried pycam?
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[22:22:21] <deed02392> When would you grind SiC and when would you sinter it?
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