#linuxcnc | Logs for 2019-05-26
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[02:51:06] <PL7icnc> CMorley, are you sir here online ?
[02:51:44] <CMorley> yes for a few mintes
[02:52:30] <PL7icnc> CMorley, the new Female on the forum seams to be buscan as he tries to get his system the hardway
[02:52:41] <PL7icnc> only 2 posts per tred
[02:52:54] <PL7icnc> no information on the system itself
[02:53:04] <PL7icnc> no ini or hal
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[02:53:51] <Deejay> moin
[02:54:01] <CMorley> pretty hard to help that way hey :)
[02:54:39] <PL7icnc> Deejay, Guten Morgen Wahltag
[02:54:56] <PL7icnc> CMorley, you say it
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[02:55:47] <PL7icnc> Thanks for providing the System its Sunday im Off
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[02:56:34] <CMorley> ok see ya
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[05:06:31] <XXCoder> https://youtu.be cool
[05:18:04] <XXCoder> that vuideo is pretty good so far.
[05:30:29] <XXCoder> https://www.youtube.com epoxy granite. by same guy
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[06:34:51] <Tom_L> morning
[06:34:56] <XXCoder> yo
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[07:08:30] <jthornton> morning
[07:10:16] <XXCoder> yo
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[08:43:55] <pink_vampire> morning
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[09:56:57] * jthornton is writing a C program to calculate sunrise and sunset
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[10:14:57] <rmu> jthornton: don't reinvent the wheel, there are proven libraries for that. https://midcdmz.nrel.gov
[10:16:34] <JT-Shop> he is studying C
[10:17:33] <JT-Shop> and I will study that program too!
[10:17:37] <JT-Shop> thanks for the link
[10:19:18] <rmu> np
[10:20:59] <rmu> also, http://soltrack.sourceforge.net
[10:22:02] <JT-Shop> that's cool
[10:22:23] <rmu> if your application is chicken door automation, correction for atmospheric abberation may be overkill ;)
[10:22:32] <JT-Shop> lol yea
[10:38:09] <perry_j1987> morning
[10:38:20] <perry_j1987> everybody got their coffee?
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[11:51:35] <JT-Shop> it's nap time here
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[12:51:27] <flyback> https://www.youtube.com
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[13:24:59] <perry_j1987> little 3in milling vise arrived
[13:31:48] <pink_vampire> take a pic how it fit on the mill
[13:32:14] <pink_vampire> (if we can say mill on 6040) lol
[13:32:23] <perry_j1987> lol
[13:32:30] <perry_j1987> its "cute" for sure hah
[13:32:58] <perry_j1987> took the rotating plate off for it to fit etc
[13:34:24] <pink_vampire> it is a very good base for a lamp
[13:35:36] <pink_vampire> those are my emco vise next to 123 block https://i.imgur.com
[13:36:11] <pink_vampire> here is my desk lamp https://i.imgur.com
[13:36:25] <perry_j1987> hah you wernt joking
[13:37:06] <perry_j1987> now i need to finish this vise stop
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[14:34:22] <perry_j1987> i do believe the new vise is swept in with my crapy dial indicator heh
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[14:54:37] <JT-Shop> double check it with a wooden yardstick and a tape measure
[14:57:04] <pink_vampire> LOLLL!!
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[15:06:50] <perry_j1987> JT-Shop i was using the scale on the back of my leatherman of course
[15:07:07] <perry_j1987> :P
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[16:42:28] <Deejay> gn8
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[16:55:36] <andypugh> Crikey, I just sold a 9-year-old, broken, PC on eBay for £176,
[16:59:00] <jthornton> wow!
[16:59:17] <jthornton> was it a collectors item and you failed to notice that?
[17:02:33] <perry_j1987> did it have a parallel port ? :P
[17:05:06] <andypugh> No. Not even any PCI slots: https://www.ebay.co.uk
[17:06:25] <andypugh> Did you see my 5120 x 2880 tkLinuxCNC screenshot? :-)
[17:07:04] <andypugh> I could do that because I bought a 5k resolution iMac to replace the broken one.
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[17:16:23] <sync> andypugh: I tried that before, all the linuxcnc stuff does badly with hidpi
[17:18:15] <andypugh> Well, it works but looks a little lost: https://forum.linuxcnc.org
[17:18:55] <sync> yes, I had the same issue on 4k
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[17:53:55] <XXCoder> andypugh: did you hard wipe hard drive?
[17:54:21] <XXCoder> sometimes people buy shit pcs in order to harvest data off formatted but not hard erased drive
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[18:07:43] <perry_j1987> hmm
[18:07:58] <perry_j1987> so playing with this bit of brass plate
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[18:13:22] <jthornton> on a noaa spreadsheet for sunrise and sunset they have a column Sunrise Time (LST) which has a span of 0-1 anyone know what (LST) means in that sense?
[18:16:04] <roycroft> probably local sidreal time
[18:16:28] <Tom_L> local standard time
[18:17:16] <Tom_L> "LST/LDT" (Local Time with adjustment to Daylight Saving Time as appropriate)
[18:17:41] <Tom_L> LST (Local Standard Time, no adjustment for Daylight Saving)
[18:19:06] <jthornton> the range is 0 - 1
[18:19:57] <Tom_L> maybe 0 is LST and 1 is LDT?
[18:20:02] <Tom_L> not sure
[18:21:05] <jthornton> yep looks like Local Sidereal Time
[18:23:46] <jthornton> whatever the heck that is lol
[18:25:36] <Tom_L> with respect to the distant stars (i.e. the constellations or fixed stars, not the sun or planets).
[18:26:33] <Tom_L> gettin a bit far fetched for a chicken coop door :D
[18:27:13] <jthornton> lol, just using that as excuse to refresh me in C programming
[18:27:17] <andypugh> XXCoder: In fact I took out my SSD, put back in the oriiginal splinning-rust drive then erased that at level 3. “Security Option 3 - This option is a DOE-compliant 3-pass secure erase. It writes 2 passes of random data followed by a single pass of known data over the entire disk. It erases the information used to access your files and writes over the data 3 times.”
[18:27:41] <XXCoder> nice :)
[18:27:56] <jthornton> wow
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[18:30:58] <jthornton> trying to write a C program you can supply the date and latitude and longitude and get the sunrise and sunset
[18:31:42] <SpeedEvil> Easy apart from timezones.
[18:32:04] <SpeedEvil> You basically need to look it up in a database that is no older than several weeks to be accurate.
[18:32:20] <SpeedEvil> (as it can undergo unpredictable legislative change)
[18:32:30] <jthornton> and how would you put the database in the chicken coop?
[18:33:05] <jthornton> easy to calculate sunrise and sunset for any given day and place?
[18:34:27] <jym> They call it an almanac
[18:34:28] <XXCoder> jthornton: maybe just get entire year worth of sunrises/sunsets graph it to get equation
[18:34:45] <XXCoder> then use that equation to calculate. it probably will have small error but dont matter
[18:34:56] <XXCoder> regression process
[18:35:39] <jthornton> I don't think a micro processor can read an almanac...
[18:35:54] <XXCoder> nah finding equation you find it on computer
[18:36:08] <jthornton> XXCoder: it needs to be able to calculate the sunrise and sunset based on location and date for years to come
[18:36:27] <jym> ts = 2/15 arccos (–tan φ tan δ)
[18:36:41] <XXCoder> yeah but then earth dont suddenly change times
[18:36:54] <jym> jthornton: https://aa.usno.navy.mil
[18:37:51] <XXCoder> right! not linear regression but least squares
[18:38:17] <XXCoder> power of 2 is plenty to match curve of sunlight hours.
[18:39:04] <SpeedEvil> Or just +-128 minutes of correction in a 32 element table.
[18:39:24] <SpeedEvil> (every 12 days or so)
[18:39:34] <jym> jthornton: https://aa.usno.navy.mil
[18:39:45] <XXCoder> how to use excel to do it: https://math.slu.edu
[18:40:14] <jym> cradek: You might like this https://aa.usno.navy.mil
[18:40:34] <jthornton> jym: https://aa.usno.navy.mil
[18:41:11] <XXCoder> looks like someone already did work for you
[18:41:44] <jthornton> that's pretty close to another paper I found
[18:41:56] <jym> jthornton: Do you think the chickens would might the slight deviation?
[18:42:04] <jym> mind*
[18:43:18] <jthornton> the key thing is to open the door at a time you want relative to sunrise and close the door at the time you want relative to sunset or dusk
[18:43:48] <XXCoder> yeah thats why I was talking about finding equations for sunrise and equation for sunsets
[18:43:57] <XXCoder> that way you can just calculate times
[18:44:00] <jthornton> chickens can't see in the dark so without supplemental lighting after dusk they don't move.
[18:44:10] <XXCoder> so no database at all, just 2 equations.
[18:44:37] <jym> chicken coop runway lights?
[18:44:39] <jthornton> not sure I know what you mean, it's different at different locations
[18:45:05] <XXCoder> yyou make equations from data for your location
[18:45:29] <jthornton> no, it has to be for any location not just where I'm at
[18:45:43] <jym> jthornton: (was kidding about the "...accurate to within 200 year deviation"
[18:45:55] <XXCoder> your link does just that which is nice
[18:48:32] <XXCoder> erm I meant jym's lol
[18:48:51] <XXCoder> no yours jt i cant read worth shit
[18:48:55] <jthornton> which link
[18:48:58] <jthornton> lol
[18:49:00] <jym> XXCoder: Nah, jthornton found that one
[18:49:28] <XXCoder> its good for 400 years
[18:49:31] <XXCoder> plenty of life
[18:54:06] <jthornton> dang ; is a pia with C lol
[18:54:42] <XXCoder> nahh you love it ;)
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[18:59:40] <jthornton> yea I do actually, I think this is the first time I had an actual project to do in C
[19:00:06] <XXCoder> c is so simple, but its also so easy to shoot your foot with it
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[19:00:14] <XXCoder> remember to releqase any malloc and stuff
[19:01:34] <jthornton> I've not done any malloc yet, I know it has something to do with memory but that's all
[19:01:59] <XXCoder> its way to get memory space to store whatever you need
[19:02:09] <XXCoder> but honestly your project dont need em at all
[19:02:28] <jthornton> yea it's pretty simple
[19:03:00] <XXCoder> one difference about malloc is it does NOT release at any time even after closing program. thats memory leak
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[19:03:13] <XXCoder> so if you use it, you have to release it at some point before closing,.
[19:03:16] <jthornton> ah
[19:03:22] <jthornton> thanks for that info
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[19:04:07] <jthornton> this is what I have so far https://paste.ubuntu.com
[19:05:10] <jthornton> the last few lines are not finished
[19:05:16] <jthornton> as in no ;
[19:05:19] <XXCoder> looks fine so far
[19:05:30] <XXCoder> you do comments very good
[19:06:25] <XXCoder> only difference between your style and mine is I really like to make order of ops very explict
[19:06:32] <XXCoder> ie use more ( )
[19:06:43] <XXCoder> its just style differences however
[19:07:23] <perry_j1987> hmm i need to mill a bunch of 5mm holes 1 inch deep. or should i only think about doing this with twist drills
[19:07:33] <jthornton> yea if I'm making the equation I am more specific but I'm copying equations
[19:07:43] <perry_j1987> 1/8 endmills vs twist drills for this i mean
[19:07:57] <XXCoder> why not both?
[19:07:58] <jthornton> drills are for holes, endmills are for milling shapes
[19:08:13] <XXCoder> drill to slightly bigger than endmill, use endmill to finish to precise size
[19:08:23] <XXCoder> very common at work
[19:08:28] <jthornton> if I need a metric hole I drill it just undersize then mill it to size
[19:09:16] <XXCoder> really comes down to this - whats your holes tolence?
[19:09:26] <XXCoder> +- .03" or even larger just use drill
[19:09:28] <perry_j1987> less tool change if could just helix down with 1/8 endmill though?
[19:09:43] <XXCoder> does your part depend on inside finish? need to be very smooth? either reamer or mill it
[19:09:48] <XXCoder> then lap
[19:10:29] <XXCoder> toolchanging if manual can be a concern yeah. helix can be done, but smaller diameter than final, then do final pass
[19:10:40] <XXCoder> assuming your endmill has 1" flute or more
[19:11:04] <perry_j1987> ya i was just peeking on amazon for 1/8 endmills with 1" flute
[19:11:14] <perry_j1987> thats not for wood and plastics heh
[19:11:33] <XXCoder> i work as metal cnc machinist, never wood and only rarely plastics lol
[19:12:12] <perry_j1987> ah nice.
[19:12:35] <perry_j1987> I just got a 6040 cnc router and forcing it to cut some metals :)
[19:13:08] <XXCoder> it can be strong enough for alum I think? i have one cnc router but my use for those is for wood artworks onlky, (home use)
[19:13:16] <XXCoder> work is all big machines heh
[19:13:36] <perry_j1987> i just got a little 3 inch milling vise in the mail today
[19:13:43] <perry_j1987> its installed on the 6040 now
[19:13:44] <andypugh> jthornton: Import Astral?
[19:13:56] <jthornton> in C?
[19:14:06] <jthornton> I use Astral in python now
[19:14:10] <andypugh> That part might need a shim layer
[19:14:50] <andypugh> https://people.sc.fsu.edu
[19:15:17] <perry_j1987> hoping to one day see an endmill through to its end of useful life and not see it fly off into oblivion haha
[19:15:23] <andypugh> May not actually be what you need.
[19:15:45] <andypugh> perry_j1987: I never have.
[19:16:55] <jthornton> doesn't look like what I'm trying to do
[19:17:57] <perry_j1987> i'll see if I have any er collets that are right size to hold the drillbits and try that route first
[19:27:15] <XXCoder> cool
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[19:49:53] <andypugh> Working on muy next youtube video. I fear it is going to be _much_ too long for anyone to bother watching.
[19:50:18] <XXCoder> like `10 whole minutes? your videos tend to be short ;)
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[20:02:45] <perry_j1987> this 6040 is severely lacking in z height heh
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[20:36:46] <Tom_L> andypugh, just make it uber cool and we will
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[20:56:13] <cgi> are any of the desktop CNCs good these days? I am looking to cut carbon fiber + aluminium?
[21:04:53] <Tom_L> i took the route of diy
[21:08:21] <cgi> Tom_L, I dont mind paying a bit for getting something decent - unless its exorbitant
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[21:40:58] <SpeedEvil> cgi: https://www.pocketnc.com
[21:41:13] <SpeedEvil> Don't know what you think exhorbitant is, and how robust your desk is.
[21:41:31] <cgi> SpeedEvil, those dont cut CF if i am not mistaken?
[21:41:57] <andypugh> They cut aluminium. CF is just a matter of the right tooling.
[21:42:10] <andypugh> (I think)
[21:42:36] <gregcnc> they cut anything, it's just how fast you need it done
[21:42:37] <andypugh> Why is “desktop” important?
[21:43:02] <cgi> andypugh, cf also needs a waterbath - unless I want to die sooner :)
[21:43:34] <cgi> andypugh, I just need something compact, not the current 6 ft ^3 I am using in the house.
[21:43:35] <andypugh> That’s the problem with desktop. Get a non-desktop and it can live in an enclosure.
[21:43:38] <SpeedEvil> Strong extraction may be a reasonable alternative.
[21:44:07] <SpeedEvil> Ah - well - if you think 6ft^3 is big, that's your first problem with machine tools.
[21:44:31] <SpeedEvil> More seriously - what are you trying to make, at what speed?
[21:44:54] <SpeedEvil> 100mm quadcopter frames, or carbon carbon composite reentry nosecones?
[21:44:56] <cgi> SpeedEvil, I need to cut CF - to put in a diy fixed wing plane
[21:45:26] <SpeedEvil> Of what scale?
[21:45:46] <cgi> 3ft x 2ft cut area
[21:46:01] <andypugh> Waterjet?
[21:46:28] <SpeedEvil> Is there such a thing as a non-exhorbitant waterjet?
[21:46:29] <cgi> andypugh, I've never used waterjet - are they accessible?
[21:46:41] <cgi> SpeedEvil, exactly.
[21:46:53] <SpeedEvil> $50K+ AIuI
[21:47:02] <SpeedEvil> And I don't know if small ones exist.
[21:47:08] <gregcnc> airplanes aren't exactly cheap either?
[21:47:14] <andypugh> https://shop.wazer.com
[21:47:20] <cgi> My budget is < 10k for sure
[21:47:31] <SpeedEvil> Is that teh kickstarter one?
[21:47:31] <gregcnc> unless we're talking toy planes
[21:47:49] <SpeedEvil> If it's that one, it's comedically slow cutting, and the abrasive cost is murderous for that reason
[21:47:57] <cgi> I was just looking at that
[21:48:08] <andypugh> Yes. Do _not_ take me mentioning it as a recommendation. I know it exists, and that’s all I know.
[21:48:57] <andypugh> Also, “Reservations placed today are expected to ship April 2019.” isn’t a good sign.
[21:49:00] <SpeedEvil> - I was looking at it at the time it was kickstarted, and the performance at that point was terrible for anything other than a machine to sit on your desk and make the very, very occasional cut
[21:50:00] <andypugh> Anyway…
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[21:50:52] <cgi> What is a good machine to cut CF today?
[21:51:09] <cgi> Make - > Gave it an editor's choice! Wazer
[21:51:39] <SpeedEvil> What sorts of CF cutting are you doing? Purely cutting sheet?
[21:52:12] <cgi> SpeedEvil, yes, sheets only for now
[21:53:39] <SpeedEvil> may interest https://blog.patshead.com
[21:53:46] <cgi> SpeedEvil, https://protomax.com - here is another waterjet
[21:54:42] <SpeedEvil> The pump size looks light.
[21:55:05] <SpeedEvil> Take that .25lb/minute abrasive requirement, and look up the cutting speed, and convert to $abrasive/in of cut
[21:58:36] <SpeedEvil> I can't see cut speeds broken out
[22:00:00] <cgi> could not find the pricing
[22:01:00] <SpeedEvil> Garnet is not particlarly expensive - $1/kg. But if you're doing an inch a minute, that rapidly adds up.
[22:02:35] <ziper> cgi, sandwich laminate?
[22:03:05] <cgi> ziper, laminate
[22:04:37] <ziper> any core?
[22:08:21] <cgi> ziper, probably not - but not sure
[22:09:56] <cgi> ziper, do you play with CF? cnc?
[22:25:31] <XXCoder> whew
[22:25:34] <XXCoder> so much yard work
[22:28:32] <roycroft> it was supposed to be sunny and warm today
[22:28:36] <roycroft> it was rainy and cool
[22:28:38] <roycroft> so no yard wark
[22:28:40] <roycroft> work
[22:29:01] <XXCoder> you got lucky lol
[22:29:07] <XXCoder> here it was supposed to rain but sunny
[22:29:10] <roycroft> my belt grinder stand is in primer now, and i've finished assembling the drawers for my lathe stand cabinets
[22:29:17] <ziper> cgi, CF yes, but not machining it, yet
[22:29:27] <roycroft> and my main shop is somewhat less cluttered than it was
[22:29:47] <roycroft> i'm brewing next weekend for the country fair, and have a lot of shop cleanup to do before i can do that
[22:30:19] <roycroft> so i took the inclement weather as an opportunity to do some catching up on other things
[22:30:40] <cgi> ziper, did you make some CF yourself yet?
[22:30:49] <ziper> yes
[22:31:08] <ziper> well, mostly repairs
[22:31:10] <ziper> a few parts
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