#linuxcnc Logs

Jan 18 2022

#linuxcnc Calendar

10:30 AM perry_j1987: out at the shop now with shims and measuring devices all setup
10:39 AM perry_j1987: just got the nod taken care of on the z axis i think
10:39 AM perry_j1987: needle doesnt appear to move when sweeping up and down this 4in machinist square now
10:39 AM perry_j1987: now to check tilt side to side and then i can move onto spindle tram
11:03 AM JT-Shop: hmm I have 3 2x8x8 PT I need to rip into thirds... don't really want to do it on the table saw
11:05 AM jdh: I mostly use my table saw for storage space
11:08 AM roycroft: i do a lot of ripping on the bandsaw
11:09 AM roycroft: i don't think i'd cut pt wood on a sawstop
11:09 AM pcw-home: skunkworks: Those diodes are not for flyback protection but rather part of the push-pull driver
11:09 AM roycroft: it's usually pretty wet
11:10 AM * roycroft tries to avoid pt wood generally
11:10 AM JT-Shop: on a sawstop you turn off the protection when sawing anything moist
11:10 AM roycroft: if you remember :)
11:10 AM JT-Shop: these boards are over a year old...
11:10 AM JT-Shop: you only forget once I think
11:11 AM pcw-home: (to guarantee you still have enough voltage for base drive on the bottom transistor when the bottom transistor is on)
11:11 AM JT-Shop: I'd need some kind of out feed table for the band saw but that would less kerf
11:12 AM JT-Shop: I might see if I can cobble up an out feed something or another as I'm by myself usually
11:12 AM JT-Shop: in any case it's lunch time here
11:17 AM flyback: thx for the correction
11:32 AM roycroft: that's one reason that i use the bandsaw for ripping - smaller kerf
11:33 AM roycroft: the other reason is that it's about 100 times safer than the table saw
11:34 AM roycroft: and if those 2x8s are 8' or 10' long, you should be able to handle them on the bandsaw without an outfeed table
11:34 AM roycroft: just push the board halfway through, then go around the back and pull it the rest of the way
11:39 AM skunkworks: pcw-home: Thanks - I am going to drive it with some 'power' op amps..
11:39 AM skunkworks: something like this.. https://photos.app.goo.gl/Hdq8Xq7GYgNaPGuh8
11:40 AM skunkworks: (other than offsetting the 0-5v ttl signal to +/-. (simple reistor bridge)
11:54 AM JT-Shop: roycroft, kinda hard to get behind the bandsaw https://pasteboard.co/gMiTRbFjowzN.jpg
11:55 AM JT-Shop: I'd have to stand on the sawstop :_)
12:13 PM roycroft: or rotate the bandsaw 90 degrees
12:14 PM roycroft: i have a couple good rip blades for my table saw, but i still rip on the bandsaw most of the time
12:15 PM JT-Shop: if I turn it 90 degrees then the jointer is in the way
12:15 PM roycroft: the jointer appears to be on wheels
12:15 PM JT-Shop: I have a piece of melamine 4' long so it will fit across the sawstop
12:15 PM JT-Shop: all my equipment is on wheels
12:15 PM roycroft: but if you can rig an outfeed for the band saw that works too
12:16 PM roycroft: a couple years ago i needed to rip some 16' boards
12:16 PM JT-Shop: I have a plan for the outfeed table which I need even for shorter stuff
12:16 PM roycroft: i just wheeled my band saw out onto my driveway and did the ripping there
12:17 PM roycroft: i don't think i could have ripped them on the tablesaw - iirc there's not enough clearance past the blade
12:17 PM roycroft: all my woodworking machines are on wheels
12:17 PM roycroft: my metal lathe and mill are not
12:17 PM roycroft: i plan on building a new base for the mill that has casters at some point
12:18 PM roycroft: i don't think it's worth it for the lathe,though
12:18 PM roycroft: and it would be hard to level the lathe if it were on casters
12:18 PM roycroft: it lives in a corner now, so it's not critical that i be able to move it
12:19 PM unterhaus: I need to do something about the roller base on my bandsaw, fortunately I can keep it from falling over
12:20 PM unterhaus: it's solid with the front wheel retracted though
12:29 PM miss0r: 'evening
12:31 PM JT-Shop: yo
01:02 PM unterhaus: I would like to know the coefficient of friction for a cheap amazon linear bearing
01:03 PM Tom_L: .5
01:05 PM Tom_L: 0.005 to 0.01
01:05 PM Tom_L: A significant advantage of rolling element linear guides is their low coefficient of friction, which is typically 0.005 to 0.01. Because they're made of bearing steel, they have much higher load capacities and can be preloaded for very high rigidity.
01:05 PM unterhaus: that's how much you get with one of those brass bushings from lowe's
01:06 PM unterhaus: I was thinking if I use .1 that probably is more than enough and I don't think it gives me answers I can't live with
01:06 PM Tom_L: to be most accurate contact the bearing manufacturer
01:07 PM Tom_L: and if it's china, they will just lie to you
01:07 PM unterhaus: right
01:07 PM unterhaus: probably better off loading it up and using a fish scale in a pull test
01:08 PM unterhaus: just determined that the client would rather have his machinist make something than a laser cutting place
01:13 PM roycroft: if i were a client i'd be more interested in the result than the process
01:13 PM roycroft: taking sustainability of the process into account, of course
01:25 PM perry_j1987: ok got the z axis trammed in i think
01:26 PM Tom_L: you did.. or you think you did?
01:26 PM perry_j1987: the axis itself is dialed in and then i got the spindle itself aligned
01:26 PM perry_j1987: these 123 blocks and machinist square sure made it possible lol
01:27 PM perry_j1987: i think the weakest part of this 6040 is the x axis smooth rods
01:27 PM Tom_L: now you need a set of 246 blocks
01:28 PM Tom_L: https://www.mscdirect.com/product/details/86252855
01:28 PM perry_j1987: i was playing in CAD with a model of this thing. if i took the x carriage bracket off i could mill the back with slots and then swap everything for supported smooth rods
01:28 PM perry_j1987: if i bolt a plate to the back of the uprights it would line up perfect with the bottom of the supported rails
01:30 PM perry_j1987: but i think the better bet would be to just upgrade to a more rigid mill heh
01:30 PM perry_j1987: stop messing with this thing
01:32 PM roycroft: i have made a rough sketch of my y axis rails that will protect both the linear rails and the drive screw from dust/chips generated by the router
01:32 PM roycroft: i've not drawn it in cad yet, though, but i think i have something that will work
01:34 PM roycroft: the design will solve some interference problems i might otherwise have with the conventional router table part of the machine, as well
01:37 PM perry_j1987: nice
01:38 PM diek is now known as paf-br
01:46 PM JT-Shop: that was surprisingly easy
01:52 PM JT-Shop: https://pasteboard.co/Hde4QdNSxYXU.jpg
01:53 PM JT-Shop: I need to get a new piece of melamine that one is pretty old and not very flat but it worked!
01:53 PM JT-Shop: and yes that's a 2by holding the end up on the sawstop outfeed table
02:30 PM unterhaus: I want to make a 125" transition for the floor. Never did anything like that long before
02:31 PM unterhaus: I'm practicing on the 30" transition first
02:31 PM unterhaus: might have to move the mill to get it to fit
02:54 PM roycroft: that looks like it will work fine, jt-shop
02:58 PM JT-Shop: roycroft, it did work great!
03:03 PM roycroft: isn't ripping on the bandsaw so much more relaxing than on the table saw?
03:24 PM enleth: roycroft: one is using a machine, the other is wrestling a howling banshee that wants to maim you the moment you lose your focus
03:25 PM enleth: so, yeah, pretty much
03:53 PM JT-Shop: well I don't relax around any spinning sharp objects... but less stressful to rip on the bandsaw
04:33 PM roycroft: yes
04:34 PM roycroft: the tablesaw is constantly trying to shove the part back in your face at about 200km/h
04:34 PM roycroft: the bandsaw tries to pull the workpiece straight down onto the table
04:34 PM CloudEvil: Bandsaw is fine, as long as you don't try to use not well supported slabs.
04:34 PM CloudEvil: Then it can get quite violent.
05:22 PM enleth: CloudEvil: the most violent thing a bandsaw will ever do is still tame compared to a table saw incident
05:22 PM enleth: if it doesn't just throw or snap the blade, at which point it's immediately disarmed
05:23 PM roycroft: the only time a band saw can injure a person is if the person's fingers are too close to the blade
05:23 PM roycroft: a table saw can kill a person 10m away from it
05:24 PM enleth: even then the resulting injury usually has a much better prognosis than having your fingers contact a circular saw blade
05:25 PM enleth: I can imagine a bandsaw with no covers throwing the blade being a slight risk too, but it's barely any more dangerous than having a loose bandsaw blade thrown at you by hand
05:26 PM roycroft: a bandsaw with no covers is not a properly set up and maintained machine, and does not belong in this discussion
05:26 PM enleth: indeed
05:26 PM enleth: but so is a table saw with no riving knife and those are plentiful
05:26 PM roycroft: even those cool old ones, from back in the day where they were open rame, should have covers on them now
05:27 PM roycroft: my table saw does not have a riving knife, but i have splitters that install in the inserts
05:27 PM roycroft: i don't consider that as hazardous as an open frame bandsaw
05:28 PM enleth: I mean, I know there are some valid use cases that are incompatible with a riving knife and they *are* safe because no pinch risk is present for them
05:28 PM roycroft: but i also do most of my rip cuts on the bandsaw
05:28 PM enleth: but that's why a quick detach riving knife is an excellent invention
05:28 PM roycroft: and rip cuts have the greatest chance of kickback
05:28 PM roycroft: the splitters i use prevent pinching
05:29 PM enleth: fair enough
05:29 PM JT-Shop: https://semo.craigslist.org/tls/d/poplar-bluff-wood-lathe-chuck-set/7434650560.html
05:29 PM roycroft: a riving knife is somewhat safer
05:29 PM JT-Shop: psi cleaned up rather nice
05:29 PM roycroft: but my setup is almost as safe
05:30 PM roycroft: that's a nice chuck setup
05:30 PM enleth: I'm very happy with a riving knife that can be removed in a second or two, stowed on a dedicated holder right there on the fence and snapped back in place immediately after making the cut
05:30 PM roycroft: and your asking price is rather low
05:30 PM enleth: DeWalt did a good job on that design
05:30 PM roycroft: arguably, my set up is safer than most riving knives, actually
05:30 PM JT-Shop: they sell for $200 new
05:30 PM roycroft: because the splitters i use are set for each blade width
05:30 PM JT-Shop: got the tracking number on the sorby chuck
05:31 PM roycroft: they are exactly the width of the kerf
05:31 PM roycroft: and my blades have several different kerf widths, including one that is custom ground
05:32 PM roycroft: i haven't used my lathe all that much, but i'm very happy with the sorby chuck i got for it
05:32 PM roycroft: i'm looking forward to filling in my set of jaws over time
05:33 PM enleth: roycroft: I made a drawing of the fatory riving knife in case I ever need it for a thicker blade - I can get it lasercut for pennies a piece and grind it to thickness on a surface grinder
05:34 PM enleth: so far I never needed that, the saw still has the blade it came with, it's shit but it's used to cut garbage for rough shop construction anyway
05:34 PM roycroft: enleth: this is what i use
05:34 PM roycroft: https://www.rockler.com/micro-jig-mj-splittertrade-for-table-saw
05:34 PM roycroft: i have an insert for every blade
05:35 PM roycroft: so i have splitters for every blade
05:35 PM enleth: nice idea
05:35 PM roycroft: i use about 8 blades on a regular basis
05:35 PM JT-Shop: most of the time when I list something on craigslist the goal is to give it a new zip code not to make money
05:35 PM roycroft: i try to price things to move on cl
05:35 PM roycroft: and usually the bigger the item, the faster i want it to go away
05:36 PM JT-Shop: I try and price it so people don't think I'm giving it away but low enough if someone is strapped for cash they can still afford it
05:36 PM enleth: I have to say some of the microjig stuff is pretty cool and innovative
05:36 PM roycroft: i've been pretty happy with their stuff
05:36 PM roycroft: their push blocks lose some of their sticktion over time
05:36 PM enleth: don't they have replaceable feet?
05:36 PM roycroft: but i use them all the time
05:37 PM roycroft: my table saw does not have a blade guard
05:37 PM roycroft: the microjig push blocks act as a very effective blade guard
05:50 PM roycroft: i think the problem with solidworks is that it's single-threaded, at least the way it's running on my imac
05:51 PM roycroft: i was doing something that's cpu bound, and i noticed that it's using 50% of cpu when i have the vm configured with 2 cores
05:51 PM roycroft: the same exact operation uses 33% of cpu when it's configured with 3 cores, and 100% of cpu when it's configured with 1 core
05:52 PM roycroft: there must be some hypevisor setting to allow it to use multiple cores
05:52 PM roycroft: i can't imagine that solidworks itself is at fault
05:53 PM roycroft: nobody would use it if it could only run on one core
06:04 PM JoseIgnacioRome4: A lot of sw is single threaded
06:05 PM JoseIgnacioRome4: Lots of geometry operations are not trivially parallelizable
06:09 PM roycroft: well this is running incredibly slowly
06:09 PM roycroft: and the processor is 3.2GHz, so it's not a slow processor
06:10 PM roguish[m]: roycroft: hah you're right. the older SW was quite single threaded...... newer ones are better. finally use the gpu's correctly
06:10 PM JoseIgnacioRome4: Are the graphics drivers/forwarding running correctly?
06:11 PM roycroft: yes
06:11 PM roycroft: i'm getting really close to going out and buying a machine just for sw
06:11 PM roycroft: i don't think i need a really high end graphics card for it
06:12 PM roguish[m]: it's a graphics pig. you really need a good card, one that is 'approved'
06:12 PM roycroft: this imac has a radeon ru m380, with 2GB of vram
06:12 PM roycroft: r9, rather, not ru
06:12 PM roguish[m]: not a really high end, but decent one.....
06:12 PM roycroft: it's mediocre at best
06:13 PM roycroft: but i'm running a 5k display and 2 4k displays with it
06:13 PM JoseIgnacioRome4: Yeah may be a bit overtaxed
06:13 PM roguish[m]: the older SW, like earlier that 2018, worked better with gaming cards, now it's better with real CAD cards,
06:13 PM roycroft: i may try shutting down the 4k displays
06:13 PM JoseIgnacioRome4: A setup a coworker has he has a quadro just for the solidworks vm
06:13 PM roycroft: i'm running 2012
06:14 PM roycroft: this is an imac, so i can't do anything about the gpu
06:14 PM roycroft: or add another one
06:14 PM roycroft: but i was thinking a used pc with a quadro p1000 might do fine
06:14 PM roycroft: as long as it has at least 32GB of ram
06:15 PM roycroft: i'm not building a spacecraft
06:15 PM roycroft: that's why it's frustrating
06:16 PM JoseIgnacioRome4: Lol yeah that should be plenty
06:16 PM roycroft: right now i just have an assembly with an 80/20 extrusion, a linear rail on top, and 32 holes with t-nuts behind them
06:16 PM JoseIgnacioRome4: At work our MEs made do with 8 gigs of ram and a quadro k2000
06:16 PM roycroft: the smart fastener wizard totaly pukes out when i try to use it
06:16 PM JoseIgnacioRome4: For SW 2011
06:17 PM roycroft: it should just take a few seconds, instead it takes the better part of an hour
06:18 PM roycroft: i think i'm going to kill the vm and see if there's anything i can tweak
06:18 PM roycroft: and then maybe do what i mentioned earlier - turn off the 4k displays
06:18 PM roycroft: i only use the primary display for sw anyway
06:39 PM roycroft: well this is pretty impossible to deal with
06:40 PM roycroft: if i mate parts in an assembly, then fix the mated parts and delete the mates, is that likely to improve performance?
06:40 PM roycroft: it makes it a pain in the butt to make any changes later, but there are certain parts that i know will never change
06:49 PM roycroft: that absolutely did the trick
06:49 PM roycroft: i was able to add the fasteners in about 20 seconds after i fixed all the t nuts
06:49 PM roycroft: and i did not even delete the mates - they're auto-suppressed when the component is fixed
07:00 PM CloudEvil: :)
07:02 PM roycroft: when i tried earlier to add those same fasteners sw spun around for an hour and then failed
07:02 PM roycroft: so i guess mates are expensive
07:02 PM roycroft: very expensive
07:19 PM -!- #linuxcnc mode set to +v by ChanServ
07:41 PM roycroft: this may be the single most important thing i've ever learned about solidworks - mate then fix
07:41 PM roycroft: *everything* is going way faster than it did earlier, by a couple orders of magnitude, it seems
07:43 PM Tom_L: roycroft, mates are expensive irl too :)
07:46 PM roycroft: yes
07:46 PM roycroft: but if you get fixed after you get your mate you don't have the expense of raising kids in addition to the expense of your mate
07:47 PM roycroft: so it's still sage advice
07:50 PM roycroft: i just ordered my free covid-19 tests
07:50 PM roycroft: the website rolled out a day early
07:50 PM XXCoder: ordered em too
07:50 PM XXCoder: we are in isolate now, since seems my bros friend have covid and he visited
07:52 PM roycroft: that sucks
07:52 PM XXCoder: yeah
07:53 PM XXCoder: my bro went to test, and if hes postive hes staying at his friend house
07:56 PM roycroft: i'll be so glad when this pandemic is finally over
07:56 PM roycroft: and it should have been over last spring
07:56 PM XXCoder: indeed
07:58 PM Tom_L: insurance sent something that gets a free one too
07:59 PM roycroft: yeah, insurance has to cover 8 tests/month now
07:59 PM roycroft: this is a really big help in ending it
07:59 PM roycroft: testing
07:59 PM roycroft: contact tracing
07:59 PM Tom_L: they will probably run short on tests now though
08:00 PM Tom_L: they were already hard to find
08:01 PM roycroft: yes, although i think production really ramped up when the president announced the testing program
08:01 PM roycroft: and i suspect he would have announced it sooner had more test kits been available
08:02 PM Tom_L: is it online only?
08:02 PM Tom_L: i haven't looked into it much
08:02 PM Tom_L: i have a few
08:02 PM Tom_L: sent some to her sis in Ga that couldn't get any
08:05 PM roycroft: the free tests are online only for now
08:05 PM roycroft: the ones directly from the government
08:05 PM roycroft: the ones insurance cover you can get at a pharmacy
08:05 PM roycroft: they just bill your insurance
08:06 PM Tom_L: right
08:06 PM Tom_L: i got notified on that
08:06 PM roycroft: covidtests.gov
08:07 PM Tom_L: got it already but thanx
08:07 PM XXCoder: also https://special.usps.com/testkits
08:09 PM Tom_L: one links the other one
08:09 PM XXCoder: lol ok
08:12 PM roycroft: yeah, distribution is being handled by the usps
08:12 PM Tom_L: cause they're so damn reliable...
08:16 PM roycroft: if i felt a pressing need to get tested i'd go to my doctor's office and get tested
08:16 PM roycroft: when i get mine i'll probably use one of the kits right away just to see
08:17 PM roycroft: but i'll save the others for when i feel i may have been exposed
08:17 PM roycroft: unless the shelf life is close to expiring, in which case i'll go ahead and use them up
08:18 PM roycroft: i have no idea what the shelf life is of the ones i'll be getting
08:46 PM enleth: roycroft: all the ones I've had in the past months had expiration dates roughly 20-24 months ahead, different brands, so I'd wager they're generally good for 24 months from date of manufacture
08:47 PM CloudEvil: Though possibly not due to genetic drift.
08:48 PM enleth: good point
08:48 PM XXCoder: enleth: good to know. thanks
08:49 PM enleth: though I haven't seen anyone panic that the DIY tests are turning useless due to new virus strains
08:49 PM enleth: guess they did a good job selecting markers that don't change much
08:50 PM roycroft: enleth: that's not the case here
08:50 PM enleth: still, this is something to look out for
08:51 PM roycroft: it was recently found out that the state of florida had to toss tens of thousands of covid-19 test kits that had expired because they hadn't bothered to distribute them
08:51 PM enleth: but of course
08:51 PM roycroft: and those kits have not been available for 20-24 months, so the expire date must have been a lot shorter
08:51 PM roycroft: but those were probably early test kits anyway
08:52 PM roycroft: the newer ones may have a longer shelf life
08:52 PM roycroft: the tests that the government are sending folks for free can detect the omicron strain
08:53 PM roycroft: i'm really not too concerned about any of this
08:53 PM enleth: it's also possible that these particular ones were marked with shorter dates because no data was available yet at that time to be sure that a longer expiry date is safe
08:53 PM enleth: I imagine there might be exact same tests made now with longer dates printed on them just because there was more time to figure out how they degrade
08:53 PM roycroft: i stay away from covid lepers and environments that facilitate the spread of the disease
08:54 PM roycroft: as i said, i'll probably use one of the tests right away just to see what's up with it
08:54 PM roycroft: but the rest i'll save in case i ever have symptoms that may indicate covid-19, or if i find out i have likely been exposed
08:55 PM enleth: I'm trying to get tested at least twice a week as it's just not possible for me to avoid all exposure
08:55 PM enleth: so far so good
08:56 PM roycroft: i'm at a point where i'm not letting up on safety measures, but i'm really not caring very much about the unvaccinated any more
08:56 PM roycroft: earlier on in the pandemic i was very concerned about possibly spreading it
08:56 PM roycroft: now, not so much
08:57 PM roycroft: those people have proven that they don't care about anyone but themselves
08:57 PM roycroft: and while i've not stopped caring about them, i don't care as much as i used to
09:21 PM solarwind: I've been successfully TIG welding cast iron with ER80S-D2. No cracks at all so far. But I've also been preheating to very high temperatures
09:33 PM skunkworks: https://photos.app.goo.gl/oinAJPMnd5tSbMW88
09:34 PM Tom_L: skunkworks, made a little progress ehh?
09:35 PM Tom_L: wired to the old board?
09:35 PM skunkworks: still waiting on parts.. But it kinda works..
09:35 PM Tom_L: hope for the best
09:35 PM skunkworks: no - just coppied some of the balancing circuit.
09:35 PM Tom_L: ahh