#linuxcnc Logs

Oct 17 2021

01:05 AM Deejay: moin
04:55 AM JT-Cave: morning
05:14 AM Tom_L: morning
05:56 AM JT-Cave: 42°F in Coop Deux
09:57 AM unterhaus: putting drywall up on the ceiling isn't much fun, even if it's only 16 inches wide
10:27 AM bjorkintosh: unterhaus, make someone else do it, perhaps for a favor or a small fee?
10:27 AM bjorkintosh: while you get to do the fun thing you want.
10:28 AM unterhaus: pretty hard to find anyone to do any construction around here right now, much less a little job like this. But I like the way you think
10:29 AM Tom_L: i'd rather hang it than sand it overhead
10:30 AM bjorkintosh: hazmat suit, Tom_L.
10:34 AM unterhaus: I'm a firm believer in my no-sand technique of additive compound until it's flat
10:35 AM unterhaus: and this is a repair in my shop, which was previously done by a diy that didn't understand what they were doing
10:36 AM unterhaus: I just took down a 16" inch strip so I could insulate the rim joist and use up all of my remaining 5/8 sheetrock
11:01 AM * JT-Shop has ran out of rounds to split...
11:01 AM JT-Shop: must be nap time
11:10 AM JT-Cave: roycroft, I just downloaded the linuxcnc image http://www.linuxcnc.org/iso/linuxcnc-2.8.1-pi4.zip and flashed it to the sd card with etcher
11:10 AM JT-Cave: latency 60ish but I want to try this 64 bit that has better latency https://forum.linuxcnc.org/9-installing-linuxcnc/39779-rpi4-raspbian-64-bit-linuxcnc#178299
11:11 AM JT-Cave: 30ish with that one
11:11 AM Tom_L: better
11:12 AM JT-Cave: you could do software stepping with that one
11:13 AM roycroft: building a preempt-rt kernel according to your guide did not work for me with raspbian 10.11, jt-cave
11:13 AM roycroft: i think you omitted a step in the guide
11:14 AM JT-Cave: that would have been for an older version of the os I'm sure, it's been a while
11:15 AM JT-Cave: something might have changed since I wrote it
11:15 AM roycroft: i reinstalled raspbian last night, updated it to 10.11, and did my local customizations, and then made an iso so i can easily get back to that point without having to redo that stuff
11:15 AM roycroft: i'm about to try the rt kernel build again now
11:16 AM roycroft: if i get it working i'll let you know what to change in that doc
11:17 AM roycroft: oh, i didn't update to 10.11 yet
11:17 AM roycroft: i guess i'll do that first
11:17 AM Tom_L: so 64bit seems better on the rpi4
11:18 AM roycroft: a 64 bit kernel might be nice, and 11.1 might be nice, but i don't want to go to either of those places right now
11:19 AM Tom_L: or 11 :)
11:19 AM Tom_L: scroll bites again
11:20 AM roycroft: i tried his guide with 10.11, not 11.1
11:20 AM Tom_L: got some new specs yesterday, at least now i can see the monitor
11:21 AM JT-Cave: hmm browser does not launch in the lcnc rpi os
11:23 AM JT-Cave: something in the kernel is blocking the sandbox whatever that is
11:28 AM JT-Cave: scratch that 64 bit Andy says there is not a 64 bit armf linuxcnc
11:28 AM Tom_L: huh
11:28 AM JT-Cave: https://forum.linuxcnc.org/9-installing-linuxcnc/39779-rpi4-raspbian-64-bit-linuxcnc-gmoccapy-problem?start=0
11:28 AM roycroft: my actual goal is to get a robust, fully functional linuxcnc install on an rpi
11:28 AM JT-Cave: but this page says you can install it
11:28 AM roycroft: it's not to play with raspbian and build kernels
11:29 AM roycroft: i have a relay hat coming for the pi, btw
11:30 AM JT-Cave: well crumb my tool is 64 bit and won't run on the 32 bit rpi
11:30 AM roycroft: the usps slowdown has officially begun, and i don't want to wait until i do the gpio testing before ordering it
11:30 AM JT-Cave: with that thought I'm cooled down and time for a nap
11:30 AM roycroft: all my parcels that were supposed to be delivered yesterday, and that arrived in portland on friday, are now scheduled to be delivered on wednesday
12:28 PM JT-Shop: my rpi tutorial was done with the lite version, no other versions were tested
12:38 PM roycroft: for building a kernel that should not matter
12:38 PM roycroft: anyway, i have to go to work now, but i'll get back to the kernel build later on
02:27 PM * JT-Shop ponders how he wants to build a shelf with 2x2 corners and plywood shelves
02:27 PM Tom_L: lightweight shelf?
02:30 PM JT-Shop: just a set of shelves for auto stuff and fits between the garage doors
02:31 PM JT-Shop: 2x2 corners so the safety eye can see around it
02:33 PM Tom_L: i got some from sams for that
02:34 PM Tom_L: metal with wood shelves long time ago
02:34 PM JT-Shop: none of the pre made are the correct size
02:35 PM Tom_L: you should find somebody with a well equiped metal/wood shop then :)
02:36 PM JT-Shop: needs to be 20w 12d and 42h
02:36 PM JT-Shop: yep if I only knew someone with a well equipped metal and wood shop...
02:38 PM Tom_L: chilly mornings but nice days
02:39 PM JT-Shop: yes, very nice here too... back to stacking firewood for me
02:40 PM Tom_L: that chore should be getting close to done
02:40 PM Tom_L: well, it's never done... but
02:45 PM JT-Shop: I have the new bins full to the top and the old bins are full except one
02:46 PM Tom_L: you ever get the new one covered?
02:46 PM Tom_L: back when prices were outrageous you held off
02:49 PM JT-Shop: no, need to frame up the roof... well there is some tin up there but it's just laying flat
02:52 PM JT-Shop: new bin holds 363 cubic feet or 2.8 chords
02:53 PM Tom_L: should last a while
03:02 PM roguish[m]: JT-Shop: Are you still around?
03:03 PM JT-Shop: in and out... burning trash
03:04 PM roguish[m]: are you total python, or can you code some C
03:04 PM JT-Shop: hello world in C, I can do a little
03:05 PM roguish[m]: there is a comp, vfdb_vfd, which is for Delta VFD-B. I actually used it to run my delta VFD-E, as the modbus commands are mostly the same
03:05 PM roguish[m]: Seb wrote it.
03:06 PM roguish[m]: I want to extend it a bit to include JOG and ORIENT
03:06 PM Tom_L: learn by example?
03:06 PM Tom_L: i used to dabble a little in c but it's been quite a while
03:07 PM roguish[m]: I will probably need some coding assistance...... that goes for you too Tom_L
03:07 PM Tom_L: is it c or c++?
03:07 PM roguish[m]: and since Seb is back a bit, I'll ask him also.....
03:07 PM Tom_L: comp is probably c
03:08 PM roguish[m]: I had a beginning C class years ago.
03:08 PM JT-Shop: total covered firewood storage is 820 cubic feet or 6.4 chords
03:08 PM Tom_L: i've got K&R online if you want it
03:09 PM JT-Shop: I've never went to class for programming
03:09 PM Tom_L: me either
03:09 PM roguish[m]: JT-Shop: burning garbage? hell, that's totally illegal out here........
03:09 PM JT-Shop: no, boxes
03:09 PM JT-Shop: everything is illegal out there
03:09 PM roguish[m]: pretty much.
03:10 PM JT-Shop: smoke timer going on the pellet grill...
03:10 PM roguish[m]: CAL just passed a law making it illegal to remove your rubber in the middle of fucking.....
03:10 PM JT-Shop: lol
03:11 PM roguish[m]: what da ya do if ya have a blow out?
03:12 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/pdf/K&R_C_2nd.pdf
03:12 PM roguish[m]: the C class I had was an online community college class...
03:13 PM Tom_L: you should be better at it than me then :)
03:13 PM roguish[m]: Tom_L: thanks. I may have a printed 1st edition somewherer
03:13 PM JT-Shop: actually did a bit of C with ardunio's
03:13 PM Tom_L: yeah
03:14 PM Tom_L: well before arduino was a thing
03:14 PM Tom_L: did a little bit on the pc prior
03:14 PM roguish[m]: anyway, i think i'll give it a go. can't hurt anything, i don't think.
03:15 PM roguish[m]: The comp was pretty darn easy to use.
03:17 PM JT-Shop: ha that was one of the comps that had me as author...
03:17 PM roguish[m]: ok, gotta go outside and check around the house. we might actually get some rain late in the week. not holding my breath though......... a La Nina is in the Pacific. usually means the storms are pushed north and we go thirsty
03:17 PM roguish[m]: JT-Shop: yes. you are in the list.
03:17 PM JT-Shop: I removed it
03:28 PM JT-Shop: wow 28% humidity... time to open doors
03:42 PM CloudEvil: https://www.youtube.com/watch?v=mhJRzQsLZGg - they're doing rigging on the launch tower Z axis
03:45 PM CloudEvil: All four of the bearing carriages onthe nearside of the tower. (black skates)
04:22 PM * JT-Shop thinks someone was trying to get me to whitewash their fence
05:10 PM Tom_L: JT-Shop, bug sprayer
06:11 PM roycroft: well that was not fun at all
06:11 PM roycroft: i had some elections work to do downtown, then i had to drive down to the office to deal with an ethernet switch that did not come back online when there was a power outage there last nigh
06:11 PM roycroft: t
06:12 PM roycroft: i took care of that, and was almost all the way home when i realized that i had left my backpack, containing my cell phone, laptop, ipad, etc. at the office, and had to drive all the way back to get it
06:12 PM roycroft: it's about 50 minutes from my house
06:13 PM roycroft: but the good part is that had other things i needed to do at the office, and i was able to get them done while i was down there today, so my boss won't be able to try to get me to show up when he is there
06:18 PM enleth: finally, the grinder is alive: https://i.imgur.com/7H9aQPV.jpg
06:18 PM roycroft: that looks like a jeremy schmidt grinder
06:19 PM enleth: yes, it is, gen2 metric with elongated body for 2000mm belts
06:19 PM roycroft: and it looks like a rev 2
06:19 PM roycroft: i have a rev 1, but i'm almost certain i'm going to build a rev 2
06:20 PM roycroft: i really think it's the best design out there for a belt grinder
06:20 PM enleth: same, that's why I built it
06:20 PM roycroft: i recently made an extra long table for mine
06:20 PM enleth: although I can see a bunch of changes I'll probably make to a second one, if I get around to making a second one
06:21 PM roycroft: i had a big stationary edge sander in my wood shop, and i sold it to make some room
06:21 PM roycroft: i figured i could do my edge sanding on the belt grinder if i had a long table
06:22 PM enleth: for one, making the tensioner post taller so I can shorten the body - the thing is uncomfortably long, it'll be hard to fit it into the space I have
06:22 PM roycroft: did you make a contact wheel arm for yours?
06:22 PM enleth: it can't be too tall, but there's definitely a sweet spot that the stock dimensions don't reach
06:22 PM enleth: no, not yet
06:23 PM enleth: it literally ran for the very first time 15 minutes ago
06:23 PM roycroft: make that before you decide on that modification
06:23 PM roycroft: as designed, there's barely enough room for a 250mm contact wheel
06:23 PM enleth: room, as in spare belt length?
06:23 PM roycroft: if you raise the tensioner you might not be able to fit a contact wheel that larg in front
06:24 PM roycroft: yes
06:24 PM roycroft: and most folks like to use 300mm contact wheels
06:24 PM roycroft: but you're using longer belts, right?
06:24 PM enleth: yep, 50x2000
06:24 PM enleth: and the whole grinder is longer to accomodate them
06:24 PM roycroft: so yeah, that's an extra 200mm
06:25 PM enleth: anyway, there has to be *something* that can be done to make the thing shorter
06:25 PM roycroft: so you could shorten it by 100mm and still have clearance for the contact wheel
06:25 PM roycroft: i'm fine with the length of mine, but i built a stand very similar to the one jeremy build for mine
06:26 PM enleth: also, the leg bases should extend to the right a bit more for stability when not bolted to the bench
06:26 PM enleth: a bit of a corner case
06:26 PM roycroft: in fact, when i ordered the rev 2 plans from him, i wrote him and asked if he had any advise on making it fit well on the stand
06:26 PM enleth: but it's not going to be bolted down as long as I'm working on it
06:26 PM roycroft: because rev 2 is a lot taller than rev 1
06:26 PM enleth: and it's right on the verge of tipping to the right when horizontal and not bolted down
06:27 PM roycroft: he emailed me back some sketchup files he quickly did to lower the rev 2 enough that everything would still work, yet was still almost the same height as rev 1
06:27 PM enleth: also, the weight of the motor actually makes it quite difficult to turn it back to vertical and lock it there
06:27 PM roycroft: it's intended to be bolted down
06:27 PM roycroft: yes, that can be a bit of a problem
06:28 PM roycroft: my first motor was much heavier than the second one
06:28 PM roycroft: and it was a real hassle
06:28 PM enleth: I'm considering a positive locking detent for the vertical position instead of the friction lock
06:28 PM roycroft: perhaps a strut to help handle the weight?
06:28 PM roycroft: or a spring of some sort?
06:29 PM enleth: a torsion spring could work
06:29 PM roycroft: my first motor i bought used, and it lasted a couple years
06:29 PM roycroft: it was 2hp
06:29 PM roycroft: i replaced it with a 3hp motor, and i'm much happier with that
06:29 PM enleth: the motor I used now is 3 phase 2.5kW
06:29 PM roycroft: 3hp is 2.2kw
06:29 PM roycroft: so almost the same
06:30 PM roycroft: but the new motor weighs less than the old one
06:30 PM roycroft: and is much shorter
06:30 PM roycroft: it's a lot easier to pivot the drivetrain now
06:30 PM enleth: mine is ISO/IEC frame, they're not known for being light
06:30 PM enleth: on the other hand, they're effectively immortal
06:31 PM enleth: oh, right
06:31 PM roycroft: building that belt grinder was one of the best additions to my shop ever
06:31 PM enleth: it probably doesn't help that I made the motor and tensioner pulleys out of cast iron, with no lightening cuts
06:32 PM roycroft: i'm not sure if i have any pics of mine
06:32 PM roycroft: but it looks like a jeremy schmidt grinder
06:32 PM enleth: that's what I had on the scrap pile, if I wanted to make aluminum pulleys I'd have to cast blanks
06:33 PM enleth: and for that I'd have to fix or replace the contactor on the furnace
06:34 PM enleth: it was easier to grab the chunk of cast iron that was right there and turn it into the pulleys
06:34 PM roycroft: it's fine
06:34 PM roycroft: the added mass will make it run more smoothly
06:37 PM enleth: for now I'm happy it tracks properly right off the bat
06:39 PM enleth: if only the welds were a bit prettier
06:40 PM roycroft: paint will help with that
06:40 PM roycroft: the welds on mine are not very pretty either
06:41 PM roycroft: my gmaw welder is a bit underpowered for steel as thick as the grinder uses
06:42 PM roycroft: but it is welded solidily, even though it's a bit ugly
06:42 PM roycroft: but i promise, paint will help a lot
06:42 PM enleth: I wish I had switched over to double pulse spray transfer immediately, but I wasn't really familliar with the new welder back then
06:43 PM enleth: this mode turns that welder into a literal glue gun for metal
06:43 PM roycroft: i also did not have a rotary table for my mill when i built mine
06:44 PM roycroft: which made the arc slots a lot of work
06:44 PM enleth: you have to actively try to make bad welds, the thing compensates for all but the most egregious torch position mistakes
06:44 PM roycroft: i do have a rotary table now, so if i build the new version it will look neater and be less work
06:45 PM enleth: oh, for the slots I actually cheated, ordered the parts laser cut
06:45 PM enleth: I admire Jeremy's determination to show that it is, in fact, possible to drill and file them, but I'm nowhere that patient
06:48 PM enleth: and it was still cheap
06:49 PM enleth: total cost of lasercut parts, shipped, was slightly more than 2x the cost of raw stock
06:51 PM roycroft: yes, i think it's great that he both designed and demonstrated that it can be built using just hand tools, but a little help from some bigger machines is always good
06:52 PM roycroft: btw, i think i spent about 20 minutes filing the slot after drilling it out
06:53 PM roycroft: it was 20 not fun at all minutes, but it wasn't excruciatingly long
08:06 PM Contract_Pilot: Wow...
08:06 PM Contract_Pilot is now known as Rhine_Labs
08:57 PM roycroft: i guess i should get back to work on the pi
09:04 PM skunkworks: https://www.youtube.com/watch?v=D0jmbho4Hmo
09:05 PM XXCoder: insert fun picture
09:08 PM skunkworks: yah - that was supposed to be at the beginning - didn't check the video and just uploaded. Still cute. Daughter sung that in the kitchen..
09:08 PM XXCoder: so you got some lathe?
09:10 PM skunkworks: an old cincinnati milacron we have had for a long time.
09:10 PM skunkworks: Finally getting back to it.
09:19 PM Tom_L: getting inspired again ehh?
09:20 PM Tom_L: damn that's a bunch of belts on the back of that thing
09:29 PM skunkworks: a couple...
09:29 PM skunkworks: we had a good year of crazy.. Hope now things will settle down
09:30 PM XXCoder: good question
09:35 PM skunkworks: there - fixed it.
09:35 PM skunkworks: https://www.youtube.com/watch?v=-J7EmnRZXjw
09:38 PM skunkworks: Tom_L: it was 50hp...
09:40 PM Tom_L: certainly wouldn't wanna get wrapped up in that
09:42 PM Tom_L: those new brittan i ran had big motors on them as well.. 30hp at least
09:43 PM skunkworks: we sold the 50hp dc motors.. We have a 20?hp dc that was off of a similar lathe. We could use that - or go with a vfd and 3 phase.
09:43 PM skunkworks: we don't know yet
09:44 PM skunkworks: the gearbox has a 4:1 reduction in it
09:44 PM skunkworks: also
09:44 PM Tom_L: man there would be no stoppin that thing
09:44 PM Rab: That vintage panel with the jog wheels is a cool thing to preserve. Are the controls all electrical, or are there hydraulics behind the panel?
09:47 PM skunkworks: the jog wheels are resolver.
09:47 PM skunkworks: fly by wire? lol
09:47 PM solarwind: I just realized I inhaled some asbestos a while ago
09:48 PM solarwind: handling new old stock engine head gaskets
09:48 PM Rab: Haha @ switching resolvers
09:49 PM skunkworks: Rab: right!? crazy..
09:49 PM skunkworks: I will take a video of one of the resover gearboxes... 2 resolvers hooked to 2 different gear ratios..
09:50 PM XXCoder: hope to see it running sometime
09:51 PM skunkworks: XXCoder: me too :)
09:51 PM skunkworks: it shouldn't be too bad..
09:54 PM XXCoder: yeah
09:54 PM XXCoder: it seems reasonable shape just need maintance and maybe some repairs
10:00 PM skunkworks: The K&T conversion was the most complicated.. Everything else is a cake walk..