#linuxcnc Logs

Sep 10 2021

#linuxcnc Calendar

12:51 AM Deejay: moin
03:58 AM Tom_itx is now known as Tom_L
04:11 AM Tom_L: morning
04:48 AM sono is now known as Guest1521
05:08 AM JT-Cave: morning
05:08 AM XXCoder: heys
06:05 AM * JT-Cave tries to figure out how to get a list of files from the nas
06:11 AM JT-Cave: in python
06:17 AM Eric_: "get a directory listing of the files in a directory python"
06:17 AM JT-Cave: not that simple with a network drive on linux
06:17 AM Eric_: it's not mounted?
06:18 AM JT-Cave: no idea
06:19 AM Eric_: that's a different problem then
06:20 AM Eric_: "Mounting a Shared Folder on a Linux Computer"
06:22 AM Eric_: how do you access it normally?
06:24 AM JT-Cave: caja
06:24 AM JT-Cave: but that
06:24 AM JT-Cave: 's not the problem at all
06:32 AM Eric_ is now known as unterhausen
06:33 AM unterhausen: the posts that I see that are similar to using listdir() are about getting the mount point for the share
06:36 AM enleth: I know everyone knows, but I'll say it anyway: delivery companies can go choke on a bucket of turds
06:36 AM enleth: or is that a waste of perfectly good turds?
06:38 AM JT-Cave: hmm os.scandir() might be what I need if I can figure out the syntax for the nas drive
06:56 AM unterhausen: enleth, I have a bucket full of dog poop free to a good home. HTH
07:01 AM unterhausen: I could ship, using the delivery service of your choice
07:20 AM JT-Cave: I sent an email to JPW Industries Technical Service about getting the wrong board on 8/31, I got tired of waiting so I called them yesterday and they said they will ship the correct board yesterday... I get a reply to my email saying the correct board is shipping out today... I wonder if I'm getting 2
07:26 AM Tom_L: maybe you'll have a spare for next time
09:43 AM CaptHindsight[m]: solarwind: all tools should be magical like the x-carve
09:43 AM CaptHindsight[m]: https://www.inventables.com/technologies/x-carve
09:43 AM CaptHindsight[m]: Everything you need to bring your ideas to life.
09:44 AM CaptHindsight[m]: Start creating with the easiest 3d carving software
09:44 AM CaptHindsight[m]: Forget complicated software—Easel simplifies the design process with intuitive tools and interactive apps. It’s fun, easy, and free.
09:46 AM CaptHindsight[m]: I bet it even designs what I can only dream about and has it ready for when I arrive in the shop in the morning
09:46 AM CaptHindsight[m]: it's like having your own elves
10:10 AM roycroft: actually you don't even have to dream about things - it intuits what you would dream about and does the dreaming for you
10:11 AM roycroft: i just got an email from the usps informing me that a purchase i made is being delivered today
10:11 AM roycroft: that is not unsual, but i purchased the item on ebay, and the tracking history shows it was shipped by amazon
10:11 AM roycroft: are amazon stealth selling on ebay now?
10:12 AM enleth: roycroft: the seller might be using amazon's fulfillment
10:13 AM roycroft: it appears so
10:13 AM roycroft: the seller is based in israel
10:13 AM enleth: from amazon's point of view, it probably came from the seller's online store/sales platform/etc.
10:14 AM enleth: there are online sale aggregation systems now that pull and push data from and to ebay, amazon, similar local sites, etc. at the same time
10:14 AM enleth: while acting as a backend to a self-hosted online store, a warehouse management system and an invoice generator
10:18 AM unterhausen: my wife bought something on ebay and the seller just drop-shipped it from amazon
10:18 AM unterhausen: lots of that going on
10:25 AM roycroft: i've had amazon sellers drop ship from wal*mart
10:25 AM roycroft: they are now on my blacklist :)
10:28 AM unterhausen: i only buy things on amazon that are in amazon's possession
10:45 AM roycroft: i buy a lot of books on amazon from third-party sellers
10:45 AM roycroft: goodwill stores do a lot of amazon selling
10:52 AM CaptHindsight[m]: https://variety.com/2021/tv/news/hbo-mike-judge-qualityland-a5-1234905257/
10:52 AM CaptHindsight[m]: huh, I wonder why? :)
10:52 AM CaptHindsight[m]: poking fun at Amazon and similar
10:53 AM CaptHindsight[m]: “A5,” is centered on a bioengineer who discovers the gene that makes a person an a-hole and attempts to discover the reason behind the existence of a-holes, and whether or not there’s a cure for this unpleasant affliction
11:29 AM roycroft: imported linear rails with a flat base and a round rod and come with two bearing blocks are ubiquitous on ebay and elsewhere
11:29 AM roycroft: do those need to be mounted with the rod facing up and the bearing blocks sitting on top of them, or can they be used in any position?
11:31 AM * roycroft is thinking about mounting some with the bearings on the sides, not the top
11:31 AM roguish[m]: roycroft: they can be in any orientation
11:32 AM roycroft: great
11:32 AM roguish[m]: look at www.modernlinear.com
11:32 AM roycroft: mounting on the sides might reduce sawdust accumulation on the rails
11:33 AM roycroft: i need a motion control mechanism, though
11:33 AM roycroft: that might mount underneath
11:33 AM roguish[m]: ah, yes. dirt, dust and other stuff is important. you can usually put some type of wipers on the carriages.
11:33 AM roycroft: or the rails underneath and the motion control on the sides
11:34 AM roycroft: my goal is to extract almost all of the sawdust at the spindle
11:34 AM roycroft: but i've been working with machinery for far too long to expect that i can get all of it
11:34 AM roguish[m]: it's a nice goal, but reality is different
11:35 AM roguish[m]: but you should still make lots of effort to keep things clean.
11:35 AM roycroft: exactly
11:36 AM roycroft: if i get 85% extraction at the spindle that will be good
11:36 AM roguish[m]: you can even fab extra wipers and shields, if necessay
11:36 AM roycroft: and that's an attainable goal
11:37 AM roguish[m]: those VEE guide rollers at modernlinear are pretty much self cleaning. really good for dirty environs.
11:37 AM roycroft: the stuff at modernlinear.com looks really nice
11:37 AM roycroft: but it's about 2.5x the cost of the ubiquitous imported rails/bearings
11:38 AM roycroft: mayhap well worth the extra expense, but it might push the budget beyond limits
11:38 AM roguish[m]: fyi. I do all the design for modernlinear.....
11:38 AM roycroft: especially considering this is not only the first cnc machine i'll have designed and built, it will be the first one i've owned and operated, other than my 3d printer
11:39 AM roguish[m]: it's cool. budget is important
11:39 AM roycroft: keeping the cost down on the first one is an important requirement, because i'm sure i'll make some mistakes that i'll not figure out until the machine is done
11:40 AM roguish[m]: lol true
11:40 AM roycroft: being realistic, i anticipate that i'll build this one, get some useful work done with it, and then partially rebuild it when i have a better understanding of what i really need to do
11:40 AM roguish[m]: all part of managing expectations.
11:40 AM roycroft: managing expectations is one thing i'm pretty good at
11:40 AM roycroft: it makes all my shortcomings easier to endure
11:43 AM roycroft: https://www.ebay.com/itm/164579932823
11:44 AM roycroft: that's the kind of rails i'm looking at getting
11:44 AM roycroft: i would mount that on some 1545 extrusions for the gantry
11:44 AM roguish[m]: they're ok. Thomson knockoffs.
11:45 AM roycroft: my goal with the router is to hold 0.005" - is that class of rail suitable for what i'm trying to do?
11:46 AM roycroft: it seems it should be fine
11:47 AM roycroft: everyone who sells those rails seems to be out of stock on the length i want
11:47 AM roycroft: but i can get slightly longer than i need and cut it down to length
11:48 AM roguish[m]: any and all linear rail is only as good as the structure it's mounted to. they are not structure themselves. they can sometimes add to the structure, but beware of the structural stiffnesses.
11:48 AM roycroft: right
11:48 AM roycroft: and i'm certain that 1545 extrusions will be plenty stiff for what i'm doing
11:49 AM roycroft: assuming i mount them well
11:49 AM roguish[m]: lot so people ask about the straightness specs. answer is there is no straightness spec. all depends on what it's mounted to .
11:50 AM roycroft: yes, i knew that
11:50 AM roguish[m]: think so.
11:50 AM roguish[m]: 1545 is that 1.5 x 4.5 ?
11:50 AM roycroft: my concern is about bearing deflection under load
11:50 AM roycroft: yes
11:50 AM roguish[m]: know your load.
11:50 AM roycroft: i'm still working on that part
11:50 AM roguish[m]: so some simple, quick bending calcs.
11:51 AM roycroft: my main problem with the load is that i want an er20 collet on the spindle, so i can use 1/2" shank cutters, and the spindles with er20 collets are fairly heavy
11:51 AM roycroft: as in 5kg
11:52 AM roguish[m]: all proportional to EI. E=modulus of elasticity, I = area moment of inertia
11:52 AM roycroft: so the gantry + spindle is going to end up weighing more than i woul dlike
11:52 AM roycroft: but i really don't want to be constricted as i would be with an er16 spindle
11:53 AM roguish[m]: steel E = 30e6, aluminum E = 10e6, titanium E = 17 e6
11:53 AM roycroft: adding more mounting points per rail would make them stiffer
11:54 AM roycroft: but with one of the goals being able to quickly and easily assemble/disassemble, the more mounting points, the longer it takes to set up
11:54 AM roguish[m]: all the structural section, like 1545, will have their I (area moments) in the catalogs
11:54 AM roycroft: yes, they do
11:55 AM roycroft: and 8020.net have some tools, both downloadable and online, to make those calculations easier
11:55 AM roguish[m]: joints, particulaly one that are assembly/disassembly point are always soft points.
11:56 AM roguish[m]: and are usually difficult to characterize.
11:56 AM roycroft: and to make matters worse, the gantry rails will be mounted to my router table top
11:56 AM roycroft: which is constructed of mdf with solid ash around the edges
11:57 AM roguish[m]: bolted joints usually need to be preloaded. like engine head bolts. torqued like hell.
11:57 AM roycroft: it's not going to move a lot, and it's 1-1/2" thick, so pretty sturdy, but it's also going to be difficult to mount repeatedly
11:57 AM roycroft: i'm probably going to have to embed some mounting plates into the underside of the router table top
11:58 AM roguish[m]: spread the loads out.
11:58 AM roycroft: yes, which is why i'm considering multiple mounting points for each rail
11:58 AM roycroft: largeish plates embedded in the table top
11:59 AM roguish[m]: you've always seemed to have a fair amount of common sense (at least what I've seen here on the IRC)
11:59 AM roycroft: the table is about 4' long, and maybe 4 mounts per side
11:59 AM roycroft: thanks
11:59 AM roycroft: i do think i have some common sense
12:00 PM roycroft: but i haven't taken mechanical engineering classes in 40+ years, and the engineering work i do is not mechanical
12:00 PM roycroft: the common sense doesn't solve my problems, but it helps direct me to solutions, and it usually tells me when i'm going seriously astray
12:00 PM roguish[m]: like riding a bike. hard to forget. dust off the old grey cells
12:01 PM roycroft: if i'm honest, this is one of the reasons i've decided to design this machine and build it myself
12:01 PM roycroft: the primary reason is that the application is unique, and there's nothing i can get off the shelf that will fit my criteria closely enough
12:02 PM roycroft: but a secondary reason is that by designing it myself i'll refresh my knowledge and be better prepared for building/modifying other machines
12:02 PM roycroft: a third reason, and not a minor one, is that it should be a lot of fun
12:32 PM unterhausen: fourth reason, builds character
12:53 PM roycroft: i'm already quite a character
12:53 PM roycroft: i'm not sure the world is ready for more of me
01:14 PM unterhausen: someone talked me out of using one of my celeron systems because intel built a flaw into it and it eventually kills itself if used for linux
01:15 PM roycroft: huh?
01:16 PM * roycroft has never heard of that
01:16 PM roycroft: so linux is now a murder os?
01:21 PM unterhausen: I'm not sure about the winders part of my story
01:21 PM unterhausen: but it looks like intel may have said it's not really a problem, trying to figure out which processor I have
01:21 PM unterhausen: sandy bridge flaw
01:22 PM unterhausen: the newer celerys are actually atoms in disguise
01:25 PM unterhausen: looks like it could be a problem Intel N3160
01:25 PM unterhausen: seems like a lot of people run linuxcnc on those processors though
01:31 PM unterhausen: lockups on linux are actually a different issue to the chip killing itself
01:32 PM unterhausen: apparently there is a 50Tb expected lifetime transfer capacity on usb
01:32 PM roycroft: my linuxcnc machine has an atom processor
01:33 PM roycroft: all my other servers are xeons
01:34 PM unterhausen: might be worth checking for this flaw "buss degradation"
01:34 PM unterhausen: with only one 's' in bus
01:36 PM unterhausen: although nobody has ever put a bad review on my computer on amazon
01:37 PM unterhausen: you have to use it under high load for a couple of years. It was found because of NAS systems failing
01:37 PM unterhausen: I'm going to use it and take my chances
01:39 PM roycroft: my printer has a weird bug
01:39 PM roycroft: if it runs out of envelopes and i replenish quickly it keeps on printing
01:39 PM roycroft: if i don't replenish quickly, when i do reload it it does not recognize the envelopes and keeps asking me to load them
01:40 PM roycroft: i have to open up the side door, pull out the fuser feed, push it back in, and close the door
01:40 PM roycroft: then it asks me to reload and it sees them when i do
01:41 PM roycroft: the solution, of course, is to keep it fed
01:41 PM roycroft: i'm trying to squeeze in a batch of 500 during the work day, so i can't tend the printer constantly though
01:41 PM roycroft: i can only go feed it when i take a break
01:48 PM unterhausen: only problem with my celery is i might have to build a kernel, probably aren't going to do that
02:18 PM JavaBean- is now known as JavaBean
02:26 PM roycroft: my only problem with celery is that if i accidently put some down the garbage disposal the drain will clog because the disposal doesn't chop up the long fibers
02:59 PM captain_morgan: my problem with #celery is it cant handled chained groups
03:00 PM unterhausen: most people are at least mildly allergic to celery, I'm not sure why Intel named their processor after it
03:05 PM roycroft: celery is delicious, fun to eat, and is relatively high in potassium, which is great for people with hypertension
03:06 PM * roycroft is about ready to start making and freezing soups for the winter, and may start with some delicious cream of celeray soup
03:06 PM roycroft: celery
03:06 PM roycroft: or maybe a celery-barley-mushroom soup
03:06 PM unterhausen: you sure it's not celeron soup?
03:06 PM roycroft: now i have celery on my brain :)
03:07 PM unterhausen: I find it funny that they kept using that name even after everyone decided they didn't want a celeron
03:08 PM unterhausen: I guess they tested celeron against atom and everyone hated atoms worse, so they went with celeron
03:10 PM unterhausen: all the people that get free helicopters are coming to state college today
03:11 PM CloudEvil: roycroft: lo-salt is also
03:12 PM unterhausen: my bp med promotes potassium in the blood so extra isn't a good idea
03:13 PM unterhausen: but a few low-end intel processors as a light snack shouldn't be a problem
03:28 PM roycroft: avoid bananas
03:28 PM roycroft: they're even higher in potassium than celery
03:28 PM roycroft: and they are radioactive
03:29 PM roycroft: due to that potassium
03:29 PM roguish[m]: just finished shimming my mill column so the head travel is perpendicular to the table.
03:30 PM roycroft: if you eat 500,000 bananas all at once you have a 50% chance of dying from radiation poisoning
03:30 PM roguish[m]: it was out in the B axis direction... not anymore.
03:31 PM roycroft: always a good thing to tidy up
03:31 PM roycroft: tramming is good
03:31 PM unterhausen: I'm afraid to tram my mill since it has no adjustments
03:31 PM unterhausen: have to do it eventually
03:33 PM roguish[m]: no adjutsment on mine either. had to shim...
03:33 PM roycroft: you're taking the ignorance is bliss approach?
03:33 PM roguish[m]: now have to tram the spindle to the table.
03:34 PM unterhausen: I guess I can do it all with the head attachment, if it's close enough
03:35 PM roguish[m]: all the time assuming x is truly perpendicular to y.
03:35 PM unterhausen: messing with the ram attachment would be a chore
03:36 PM unterhausen: probably wise to check that assumption
03:36 PM unterhausen: that x and y are perpendicular
03:39 PM roguish[m]: ignorance is bliss
03:44 PM JT-Shop: one more support to go on the giraffe shelves
04:41 PM CaptHindsight[m]: roycroft: "you have a 50% chance of dying from radiation poisoning" how about the other 50%?
04:42 PM roycroft: that would be the not dying half
04:43 PM CaptHindsight[m]: wouldn't you be 100% dead if you attempted to eat that many bananas?
04:43 PM roycroft: i have a hunch that if you eat 500,000 bananas non-stop you'll have other things to worry about than dying of radiation poisoning
04:43 PM CaptHindsight[m]: potassium overdose
04:43 PM roycroft: sugar overdose
04:43 PM XXCoder: gut volume
04:43 PM roycroft: well
04:43 PM roycroft: banana overdose
04:43 PM roycroft: period
04:44 PM roycroft: i'm not going to suggest an experiment to verify any of this
04:45 PM CaptHindsight[m]: 422 mg Potassium in one
04:45 PM CaptHindsight[m]: Sugar 14 g
04:46 PM XXCoder: for people where "natural" is something more than meaningless word, its great way to boost potassium without much sodium
04:46 PM CaptHindsight[m]: what could you make with 500, 000 banana peels?
04:47 PM CaptHindsight[m]: outdoor summertime hockey rink
04:53 PM CaptHindsight[m]: http://ugspace.ug.edu.gh/handle/123456789/26951 surface area of an avergae banana 171.25±22.32 cm2
04:53 PM CaptHindsight[m]: average even
04:55 PM CaptHindsight[m]: 15,790,000 sq cm per rink
04:56 PM CaptHindsight[m]: would only take 93,000 bananas to cover one rink
04:57 PM CaptHindsight[m]: so you could play 3 periods and 2 overtimes with fresh peels
05:03 PM CaptHindsight[m]: XXCoder: Potassium Chloride https://www.heb.com/product-detail/nu-salt-salt-substitute/140095
05:03 PM CaptHindsight[m]: or that cheating or un-natural?
05:03 PM XXCoder: dunno, ask "natural" people
05:04 PM XXCoder: me, chemistry is chemistry, natural or not
05:08 PM roycroft: so my boss just paniced
05:09 PM roycroft: "i know it's friday and it's the end of the day but we have a huge problem - i'm trying to use random wordpress plugin to generate a form and it is unable to send emails when i test it. this has to be fixed right away, no matter what"
05:09 PM roycroft: so i log into the website, go to random plugin that i've never seen before, set up a form, and had it send my boss an email
05:09 PM roycroft: which he got
05:09 PM roycroft: now he wants me to tell him what i "fixed"
05:10 PM roycroft: should i respond with "i fixed your brain by using mine instead"?
05:12 PM roycroft: what i actually did was save the form i set up and told him he might try either comparing what he did to my form or use my form as a template
05:12 PM roycroft: anyway, last minute friday crisis averted
05:30 PM edwards is now known as panasync
05:47 PM CloudEvil: yay
05:49 PM panasync: that sounds exciting
06:49 PM solarwind: CaptHindsight[m] I bought a 6040 CNC router ready to run off of aliexpress for less than the x carve
06:50 PM solarwind: I thought I never heard of the x carve, but I just visited the site and noticed I had it bookmarked since forever
06:58 PM skunkworks: I just setup a windows 98se vm for the neighbor.. I don't think I ever would have though I would be running windows 98se any more..
07:07 PM solarwind: NLGI #1 is hard to find. NLGI #0 even harder
07:08 PM solarwind: I guess I could mix some gear oil in lucas red and tacky
07:09 PM solarwind: Oil separation in my use case is a good thing. The spec is Rheolube 380-G1, but that's so difficult to acquire and very expensive
07:20 PM roycroft: i was finally able to get rid of windows 98 after i retired some cisco software that needed it and after i was able to copy some win98 64-bit print drivers to a windows 7 vm
07:20 PM roycroft: i actually still have a few windows 98vms, but they're archived on my nas
07:21 PM * roycroft has decided to squeeze in one more batch of 500 envelopes before dinner
07:25 PM XXCoder: fun
07:32 PM roycroft: i'll only have one batch to do this evening to keep on schedule
07:32 PM roycroft: no midnight oil burning tonight
07:34 PM XXCoder: nice
07:38 PM Tom_L: it's friday.. you can burn all the midnight oil in the barrel!
07:38 PM XXCoder: spindle light https://www.aliexpress.com/item/1005002984629905.html
07:39 PM Tom_L: so you can see the cutter shatter?
07:39 PM XXCoder: yup
07:39 PM Tom_L: not a bad idea for a microscope ring light
07:39 PM XXCoder: i had interesting idea of using 2 different sizes for even better lighting
07:40 PM XXCoder: like 60mm and 70mm
07:40 PM Tom_L: may not fit
07:40 PM Tom_L: that's only 5mm radius difference
07:41 PM XXCoder: last picture sows interior sizes too
07:41 PM Tom_L: 60/80 might
07:41 PM XXCoder: looks like it
07:41 PM XXCoder: saved link in case in future i has cnc router running again
07:42 PM XXCoder: with 3d printer i can easily print parts for it now
07:42 PM XXCoder: just still no room
07:42 PM Tom_L: pretty sure it would just get in my way
07:42 PM Tom_L: and... coolant...
07:42 PM XXCoder: not sure too, though its made for car
07:42 PM XXCoder: inside headlight tho
07:42 PM Tom_L: on the front it may be but the rear looks open
07:43 PM XXCoder: looks like yeah
07:43 PM Tom_L: which is where all the chips & coolant would collect
07:45 PM XXCoder: i guess would need to print or make other side seal
07:49 PM Tom_L: yeah, something..
07:50 PM skunkworks: Lol - we have a cmm that runs windows 95
07:50 PM XXCoder: 2095 wow much advanced model ;)
07:51 PM unterhausen: there was an "embedded" version of win 95
07:51 PM unterhausen: I'm sure it's still widely in use
07:51 PM skunkworks: This was not embedded..
07:51 PM unterhausen: it ran on regular computers
07:52 PM unterhausen: I don't think there was any difference between it and 95
07:52 PM skunkworks: I know there was xp embedded too.
07:52 PM XXCoder: isnt it heavily stripped down
07:53 PM unterhausen: xp embedded was too much
07:53 PM skunkworks: I think that is what tormach used for its mach machines? I could be wrong
07:53 PM unterhausen: 95 you could still hammer the hardware directly
07:54 PM skunkworks: right - still above dos.
07:54 PM unterhausen: there was a real-time xp that worked fine
07:54 PM unterhausen: but it was $
07:54 PM unterhausen: and they went under and their replacement was incompatible
07:55 PM unterhausen: cost me $30000 at work
08:19 PM enleth: KUKA used Win95 as a base for their 1995 generation of robots
08:20 PM enleth: but there's a catch - as the system boots, it loads a "driver" that is, in fact, a VxWorks loader
08:21 PM enleth: VxWorks preempts Windows at this point, takes over ISRs and all scheduling and turns Windows into its own subprocess
08:21 PM roycroft: sounds like an early hypervisor kind of thing
08:21 PM enleth: in an extremely rudimentary kind of way perhaps
08:21 PM roycroft: "early" outwith the context of ibm mainframes, which were doing virtualization in the 1960s
08:22 PM enleth: this, too
08:22 PM enleth: actual, hardware-assisted, secure virtualization is as old as computers themselves
08:23 PM enleth: but then PCs kinda took over and everyone seems to have forgot about what mainframes were capable of
08:29 PM Tom_L: cost maybe?
08:33 PM enleth: oh, absolutely
08:33 PM enleth: but I literally mean "forgot", not "set aside" or "shunned"
08:33 PM enleth: a lot of stuff over the last 20 years has been touted as innovation
08:34 PM enleth: but it's only been rediscovered and reinvented at best
08:36 PM Tom_L: i remember when catia wasn't a thing on a PC but mainframe only
08:38 PM Tom_L: as i'm sure alot of other software was
08:41 PM roycroft: a lot of early cad and other high-end graphics software ran on sgi hardware running iris
08:42 PM roycroft: there was not enough horespower in a pc to run that type of app decently
08:43 PM roycroft: and the framebuffers in a pc at the time were laughable at best
10:39 PM -!- #linuxcnc mode set to +v by ChanServ
11:10 PM XXCoder: interesting thread mill https://youtu.be/xuvc09tNgnE?t=195
11:16 PM Tom_L: just not a single point
11:17 PM XXCoder: yeah
11:17 PM XXCoder: better fopr life i guess
11:17 PM Tom_L: and they take it in multiple steps instead of one
11:17 PM Tom_L: faster for production
11:17 PM Tom_L: but single use instead of multiple thread sizes
11:17 PM XXCoder: yeah though i worked at prod shop, I never saw one
11:18 PM Tom_L: https://s.yimg.com/aah/yhst-94661700992560/thread-mills-11.gif
11:20 PM XXCoder: so it works for any diamter as long as you want thread per inch or whatever same as that tool?
11:21 PM Tom_L: http://onlinecarbide.com/unthreads.html
11:21 PM Tom_L: i think so
11:21 PM XXCoder: honestly not that expensive
11:21 PM Tom_L: i went with single point since they're more versatile
11:22 PM XXCoder: any thread per inch you want?
11:22 PM Tom_L: within the geometry of the tool yes
11:22 PM Tom_L: that's why i tested with some off the wall thread
11:23 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Brass_cup/Brass_Cups7.jpg
11:23 PM XXCoder: nice
11:25 PM Tom_L: i thought you'd seen those
11:26 PM XXCoder: maybe? my memory is just bad
11:27 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/extinguisher_nut/Pressure_test_cap8.jpg
11:27 PM Tom_L: that was another odd thread
11:27 PM Tom_L: the alum was a 'gage' i had my friend make for me
11:28 PM XXCoder: that one i do remember
11:28 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/extinguisher_nut/Pressure_test_cap3.jpg
11:28 PM XXCoder: still have that "gage"? or sent back
11:28 PM Tom_L: sitting on my desk here
11:28 PM Tom_L: with a spare mating part
11:29 PM XXCoder: :)
11:29 PM Tom_L: the other one went to canada
11:32 PM XXCoder: nice
11:33 PM enleth: XXCoder: a single point tool could do any pitch if you tilted the part, although you'd get a depth limitation as the shank would interfere with the edge at some point
11:34 PM enleth: but normally you don't tilt it, so the shape being cut is not a simple cross-section of the thread
11:35 PM enleth: it's more of a projection of the tool profile onto a plane normal to the thread
11:35 PM enleth: a tilted cross section
11:37 PM XXCoder: fun. thanks lol
11:37 PM enleth: the higher the pitch gets, the more side engagement of the tool you need for the same major/minor diameter difference
11:37 PM enleth: and you'll run out of side engagement depth at some point
11:38 PM enleth: as the shank will run into crest of the thread you already cut
11:39 PM XXCoder: yeah, though probably better to just use one of standard ones i guess
11:39 PM Tom_L: that was the tool geometry thing i mentioned :)
11:39 PM enleth: it's kinda hard to visualize this at first, not sure if my description is clear
11:40 PM enleth: Tom_L: yep, the key here is being able to see this projection
11:41 PM Tom_L: i got what you were saying
11:43 PM Tom_L: similar would hold true if you were cutting a helical gear
11:45 PM enleth: exactly, cutting helical gears and threadmilling projects the tool profile through the stock in the same way
11:46 PM enleth: rotated 90 degrees with respect to stock axis, but otherwise the same thing
11:47 PM enleth: actually, if you consider a gear to be a multi-start thread of an extremely large pitch and weird profile, it's just the same thing