#linuxcnc Logs

May 30 2021

#linuxcnc Calendar

01:53 AM Deejay: moin
02:21 AM -!- #linuxcnc mode set to +v by ChanServ
05:31 AM JT-Cave: morning
06:22 AM Tom_L: morning
06:39 AM Tom_L: rain this afternoon, hi 64F
06:50 AM JT-Cave: nice day for a bike ride here
06:51 AM Vq: 17°C and sun here, almost perfect.
07:11 AM JT-Cave: hmm there was something I wanted to do to my facing routine but forget what it was...
08:51 AM Tom_L: JT-Cave, you ever get that seat part figured out?
08:53 AM JT-Cave: no, I got side tracked with other things
09:01 AM Tom_L: did you still wanna try that software?
09:02 AM JT-Cave: yes, but not today I have a bunch of stuff to do then it's ice cream cone time at the Dairy Shack
09:02 AM Tom_L: np, i pulled it is why i asked
09:03 AM Tom_L: i didn'
09:03 AM Tom_L: t know if you got it
09:03 AM Tom_L: her sis is flying in anyway
09:03 AM JT-Cave: I don't think I have it...
09:04 AM Tom_L: you get ready, lemme know and i'll post it again
09:04 AM JT-Cave: I have 2 days to burn 5.1 GB lol
09:05 AM Tom_L: wanna grab it now?
09:05 AM JT-Cave: sure
09:05 AM Tom_L: one sec
09:05 AM JT-Cave: k
09:05 AM * Tom_L winds up ole betsy to see if she still works
09:07 AM Tom_L: there you go
11:16 AM -!- #linuxcnc mode set to +v by ChanServ
11:23 AM jymmmm: Morning
12:07 PM mrec_ is now known as mrec
12:33 PM Tom_L: hi jymmmm
12:34 PM jymmmm: Hey Tom_L, how's it going?
12:34 PM Tom_L: it's going
12:35 PM Tom_L: rain is starting
01:21 PM drdoc: roycroft: why not put a bogus gateway in the Win10 VM?
01:22 PM drdoc: that gives it access to everything on your local net, and nothing at all outside
01:59 PM roycroft: i usually turn off the network adapter on the vm, but sometimes i forget
01:59 PM roycroft: i can do the file shares and printing via the host machine, which does not require a network connection to the vm
02:00 PM roycroft: and i use a bogus gateway on other machines that i don't want to accidently connect to the internet
02:01 PM roycroft: woo hoo!
02:01 PM roycroft: a non-lakut coalition has been formed in israel!
02:01 PM roycroft: bibi's days are numbered
02:01 PM roycroft: as in maybe on one hand
02:26 PM CaptHindsight: will cheese replace bio-lubricants for organic machining applications anytime soon?
02:27 PM CaptHindsight: is Bibi pro LCNC or more the GRBL type of leader?
02:47 PM veegee_: Speaking of GRBL, what are some alternatives?
02:47 PM veegee_: I know smoothstepper is one, any others?
02:52 PM CaptHindsight: what are you comparing?
02:52 PM CaptHindsight: GRBL to Smoothstepper is like LCNC to Mesa
02:53 PM CaptHindsight: (please reply in SAT format)
03:02 PM veegee_: LOL!
03:02 PM veegee_: Exactly
03:02 PM veegee_: Different mechanisms of motion control
03:02 PM veegee_: parallel port vs dedicated microcontroller directly pulsing steppers vs ethernet connected controller vs FPGA hardware controlled from linuxcnc
03:03 PM veegee_: pcw_home Are the PCIE cards operating at PCIe v1 signalling rates?
03:03 PM CaptHindsight: * this is left as an exercise for the reader
03:03 PM veegee_: pcw_home I'm going to be running it externally and using a redriver, or over oculink or thunderbolt
03:04 PM veegee_: But if it's operating at v1 signalling rates, I may be able to get away with a passive cable
03:08 PM pcw_home: v1, you could probably get away with CAT6 for a short distance
03:08 PM veegee_: Yeah like less then 3m
03:11 PM veegee_: pcw_home is the FPGA interfacing to the bus via its GTP transceivers?
03:12 PM veegee_: Or is there a separate transceiver chip you're using?
03:12 PM pcw_home: No, there's a PCIE bridge
03:18 PM veegee_: pcw_home Ok cool thanks. FYI the Artix 7 chips have an integrated PCIe block for direct interface
03:19 PM pcw_home: But no open source interface to the transceivers AFAIK
03:40 PM CaptHindsight: pcw_home: do you get people that want you to remake your boards using lower cost FPGA's?
03:40 PM pcw_home: Not really, until the recent troubles we were using very cheap FPGAs
03:41 PM CaptHindsight: I proposed a design few years ago using 6i25 or similar and they wanted to use some Lattice device instead
03:41 PM CaptHindsight: but they were nuts
03:41 PM pcw_home: Glad we are not using Artix currently (unobtanium)
03:41 PM CaptHindsight: trade $2 in parts for thousands in software time
03:42 PM pcw_home: Not really enough volume for the tradeoffs involved
03:42 PM CaptHindsight: how is Xilinx now that AMD has control of them?
03:43 PM CaptHindsight: these were people that don't value their time
03:43 PM CaptHindsight: only their cash
03:44 PM pcw_home: Not sure, the current chip shortage means everything is hard to get or expensive
03:45 PM CaptHindsight: complicates new designs
03:45 PM CaptHindsight: howto design something new with currently available parts
03:45 PM pcw_home: going through purchasing for a BOM is like a minefield, you never know what part is going to get you
03:46 PM CaptHindsight: yea, and doesn't matter if you are willing to pay 2-3x the usual prices since they are not even available at 10x the price
03:47 PM CaptHindsight: I even looked at pulling parts off boards that are already built
03:48 PM pcw_home: I have had better luck buying direct from manufacturers than grey market
03:49 PM CaptHindsight: having the same problem with car parts
03:50 PM CaptHindsight: doing some restorations and mods for family
03:50 PM CaptHindsight: used engines were hard to find
03:50 PM CaptHindsight: and parts at time had doubled
03:51 PM CaptHindsight: one day a set of gaskets, pistons, bearings etc is $450, the next is $1k
03:52 PM CaptHindsight: even paint, called around to find a gallon of base (without tint) and out of stock or down to their last can
03:53 PM CaptHindsight: CL is usually flooded with old parts, not lately or 2-3X the prices
04:09 PM pcw_home: Can't help think some shortages are created
05:33 PM _unreal_: just started a burn... looking at designing something else
05:33 PM _unreal_: pcw_home, https://photos.app.goo.gl/1ejmwQjHGskbBvob9
05:36 PM roycroft: it's raw materials that account for most of the shortages
05:36 PM roycroft: not the manufactured goods, per se
05:36 PM roycroft: and a lot of that has to do with interruptions of foreign shipments during the pandemic
05:37 PM Tom_L: that thing i ordered from Ca i didn't expect tuesday? moved out of our distribution center to the local office today already
05:37 PM roycroft: so you'll get it on tuesday, as scheduled
05:37 PM Tom_L: surprised
05:37 PM roycroft: i just did a glueup
05:38 PM roycroft: and i had other work to do, so i was still out in the shop for about an hour, and the vacuum press did not cycle once
05:38 PM roycroft: i'm impressed
05:38 PM Tom_L: no leaks
05:38 PM roycroft: that, and there's enough vacuum to really suck it down
05:38 PM roycroft: this all changed after i emptied all that water out of my compressor tank
05:39 PM roycroft: before that, i'd be able to pull 20in or so of vacuum, and the pump would cycle almost constantly
05:39 PM roycroft: now i'm pulling 22-1/2in, and it doesn't cycle at all
05:40 PM roycroft: i think the key is evacuating the air fast
05:40 PM roycroft: the cauls probably seal better when they're sucked down really quickly
09:11 PM veegee: So annoying, digital calipers and micrometers, pretty much anything with a shitty LCD ends up being super low contrast and unreadable at 1.4V
09:12 PM veegee: End up throwing away button cell alkaline with 75% charge left
09:13 PM veegee: At least alkaline can be recharged if you do it very very slowly at like 0.01C
09:13 PM veegee: I don't know why these things just don't have a solar cell or something. Or a capacitor charge pump to boost LCD bias voltage
09:16 PM veegee: And silver oxide cells are multiple times the cost of alkaline
09:17 PM roycroft: maybe buy better quality metrology instruments?
09:18 PM veegee: roycroft they're all Mitutoyo
09:18 PM roycroft: then i don't know what your problem is
09:18 PM veegee: I literally described above clearly
09:18 PM roycroft: my mitutoyo calipers are about 3 years old now and still on the original battery
09:19 PM roycroft: which seems to be the experience of everyone else who's spoken about mitutoyo calipers, except you
09:19 PM W1N9Zr0: sliver oxide costs multiple times lithium because they last longer in this application. mitutoyo caliper manual says 5 years on silver oxide cell
09:20 PM Tom_L: veegee, good ones last several years
09:20 PM roycroft: i don't know what kind of battery is in mine
09:20 PM roycroft: it's the one that it came wiht
09:20 PM veegee: W1N9Zr0 I never said lithium
09:20 PM W1N9Zr0: sorry, alkaline
09:20 PM veegee: And in this case it's the micrometer
09:21 PM roycroft: if you're not using the type that they specify then don't complain
09:21 PM veegee: The display on the caliper seems to be better
09:21 PM roycroft: if you are using the type that they specify then complain to mitutoyo
09:21 PM roycroft: because your instruments would be defective
09:21 PM veegee: It's the one that it came with as well
09:22 PM roycroft: then complain to mitutoyo
09:22 PM veegee: It _works_, but the display loses contrast significantly
09:22 PM roycroft: i've seen that on harbor freight class calipers, but not on mitutoyo
09:22 PM roycroft: maybe the contacts are oxidized?
09:23 PM veegee: That wouldn't make any difference
09:23 PM roycroft: or there's non-conductive grease on the battery?
09:23 PM veegee: Also wouldn't make any difference
09:23 PM roycroft: well you're describing something nobody else has ever described
09:24 PM roycroft: so contact mitutoyo and let them fix it
09:24 PM roycroft: they'll probably send you a brand new battery that is tested to their specifications
11:10 PM veegee: https://ecatalog.mitutoyo.com/Outside-Micrometers-Series-103-METRIC-C1571.aspx What's the difference between 103-130 and 103-138?
11:13 PM synfinatic: 130 has 0.001mm graduations. 138 0.01mm.
11:18 PM veegee: synfinatic where does it say that?
11:18 PM synfinatic: google
11:18 PM veegee: Odd that it's not shown on their website
11:18 PM synfinatic: the mitytoyo website is... lame
11:18 PM veegee: Indeed
11:19 PM veegee: It shows it for the 0-25mm one though
11:19 PM veegee: What's the standard graduations for analog micrometers?
11:19 PM veegee: I've only ever had digital ones and they have a 1µm resolution
11:20 PM veegee: But now I need a 25-50mm one and the digital ones are more than twice the cost and I don't need digital _that_ badly
11:24 PM CaptHindsight: https://en.wikipedia.org/wiki/Nuclear_power_in_space#Radioisotope_systems could power the calipers even in space for a good while
11:24 PM CaptHindsight: they have enough output to drive a very bright display that you can read in direct sunlight
11:25 PM CaptHindsight: https://www.xenarc.com/Sunlight-Readable/
11:28 PM CaptHindsight: https://www.ebay.com/itm/265112882139 Generac 100KW Natural Gas Generator US $6,000.00
11:28 PM veegee: that might be worth the price for the alternator alone