#linuxcnc Logs

Jul 10 2021

01:34 AM veegee: Ok so my imperial unit micrometer arrived
01:41 AM veegee: good construction and all that
01:41 AM veegee: but ugh inches
01:41 AM veegee: sometimes graduated in 25 thousandths, sometimes in 10 thousandths...
01:41 AM veegee: idiocy all around
01:41 AM veegee: Then you have vernier scales in 1/128 of an inch
01:41 AM veegee: when thisoldtony complains about the weirdness of that on a Mitutoyo instrument, you have to know how stupid inches are
04:26 AM Tom_L: morning
04:27 AM XXCoder: yo
05:19 AM JT-Cave: morning
05:19 AM XXCoder: yo
09:16 AM perry_j1987: morning
09:18 AM * JavaBean mumbles something barely recognizable as 'just 5 more hours'
09:23 AM perry_j1987: *drinks coffee and goes mmmmm
09:46 AM snakedGT is now known as snaked
09:53 AM perry_j1987: lol i've been researching 3d probes
09:53 AM perry_j1987: and come across some funny translations from other languages like "3d taster"
09:55 AM JavaBean: well, that gives unfortunate meaning to those poor sods that got abducted by aliens
09:55 AM perry_j1987: hahaha
09:56 AM perry_j1987: thats funny
10:22 AM enleth: so I have this two-speed duct fan motor with a winding tap
10:22 AM enleth: and I'm wondering, is it harmless if it accidentally gets line voltage on both end and tap terminals?
10:24 AM enleth: on one hand, it ought to, it should work at high speed (power between tap and common) and "ignore" power on the slow speed terminal as no current should flow between terminals that are at the same voltage
10:24 AM enleth: but it's a motor and who knows what it does dynamically
10:25 AM enleth: I'm not entirely sure if I should be worrying about interlocking relays that power it
11:45 AM CaptHindsight[m]: veegee: https://www.mathsisfun.com/fractions-menu.html
11:47 AM CaptHindsight[m]: https://www.calculatorsoup.com/calculators/math/fractions.php
11:47 AM CaptHindsight[m]: https://leverageedu.com/blog/what-is-fraction/
11:50 AM CaptHindsight[m]: https://www.metric-conversions.org/length/inches-to-millimeters.htm
11:50 AM CaptHindsight[m]: that should cover most of it, ask questions if you get stuck
12:20 PM Tom_itx is now known as Tom_L
12:20 PM -!- #linuxcnc mode set to +v by ChanServ
12:20 PM Roguish: good morning all. off to the start of another hot day.
01:12 PM veegee: CaptHindsight[m] LOL
01:13 PM veegee: CaptHindsight[m] thanks for the links. It is true, roycroft did mention that the best I could do was remedial math
01:15 PM veegee: <3 They even use pizzas to explain the complex world of fractions to dimwits like me
01:16 PM veegee: And I just happened to have pizza!
01:18 PM veegee: What do I do if I have a whole pizza and roycroft wants 57/128 of it?
01:22 PM veegee: enleth the end terminal and middle tap should be fine if the motor is off
01:22 PM veegee: I mean, if it's stalled
01:24 PM veegee: But hmmmmmmmm what happens if a shorted winding is also connected to line voltage while the motor is spinning?
01:27 PM veegee: just thinking out loud here.... windings in which current is flowing create a rotating magnetic field. Rotating magnetic field induces currents in the stator, which creates its own rotating magnetic field that lags slightly behind the winding's field
01:29 PM veegee: no current flows between the shorted terminals
01:30 PM veegee: enleth should be totally fine
02:11 PM veegee: https://www.youtube.com/watch?v=Ak747RzFUa8 roycroft apologies in advance for the kind of title you hate
02:11 PM veegee: the tool itself looks useful though
02:28 PM Tom_L: what kind of bit does he use?
04:51 PM veegee: Tom_L the tool? It takes Txxx (TNMG? TCMT?) carbide inserts
04:52 PM veegee: thisoldtony keeps mentioning how fragile carbide inserts are and how they break if he even looks at them funny
04:52 PM veegee: I've never had a single insert break like that
04:52 PM veegee: Not even the cheap sum-ting-wong inserts.
04:53 PM veegee: I have the standard worn edge, cratering failure modes. Never a catastrophic failure like that. But then again, I don't drop them onto a concrete floor.
04:54 PM veegee: They're definitely not as brittle as people make them out to be, even the high hardness/low toughness grades
06:58 PM -!- #linuxcnc mode set to +v by ChanServ
07:17 PM -!- #linuxcnc mode set to +v by ChanServ
07:36 PM roycroft: the blackberry brambles put up a good fight today, but i am still winning the war
07:36 PM JT-Cave: eating them or cutting them down?
07:36 PM roycroft: the latter
07:36 PM Tom_L: or both
07:36 PM roycroft: they've taken over what used to be my vegetable garden
07:37 PM roycroft: they did so several years ago, and i've only managed to cut them back a bit
07:37 PM roycroft: but it's time to eradicate them now
07:37 PM XXCoder: how do you permently get rid of em
07:37 PM XXCoder: its so hard to get rid of em
07:37 PM roycroft: i cut them down, rip out the roots/runners as best as possible, and then mow frequently
07:37 PM JT-Cave: crossbow
07:37 PM roycroft: after a couple years they'll be gone
07:38 PM roycroft: the problem with this area is that i abandoned the vegetable garden but never removed the raised beds
07:38 PM roycroft: i abandoned it because there are some trees just south of of the garden beds that were small 20 years ago and did not cast shade over the garden
07:39 PM roycroft: now they're much larger, and that area is in shade most of the day
07:39 PM roycroft: so i built some beds to the south of the trees for growing veggies
07:40 PM roycroft: today i not only cut the blackberries down in about 1/4 of the old garden, i removed the irrigation system and garden beds from that area
07:40 PM roycroft: and went over it with the lawn mower
07:40 PM roycroft: where i can mow, i can eradicate blackberries
07:41 PM roycroft: i'll do another section next weekend
07:50 PM XXCoder: nice
08:40 PM roycroft: i am pondering, btw, the feasibility of building a cnc router that can live in the lower part of my router table
08:40 PM roycroft: that would cost me zero real estate
08:41 PM roycroft: i'm not sure if it's practical to have a cnc router sitting almost at floor level, but it's more practical than having a conventional router table sitting that low
08:42 PM roycroft: i think it would have to be a moving bed router though, not a moving gantry one
08:42 PM roycroft: otherwise the spindle would interfere with the spindle of my router table
08:44 PM Tom_L: a little more work to get x and y mobile opposed to a gantry
08:44 PM Tom_L: you basically have to stack one on the other
08:44 PM Tom_L: which might not be practical if it's under a manual router
08:45 PM roycroft: i would not have to do that
08:45 PM XXCoder: roycroft: not really. make gantry detchable
08:45 PM roycroft: the spindle can move laterally on the gantry
08:45 PM roycroft: so i'd only need to move the bed in one axial direction
08:46 PM XXCoder: is there a way to search for this https://plasticpreneur.com/wp-content/uploads/2020/07/plasticpreneur_product_manual_granulator_detail-768x768.jpg
08:46 PM XXCoder: because results is paper paper paper...
08:46 PM roycroft: xxcoder: the router table spindle hangs down, and i cannot move that
08:47 PM XXCoder: hmm true, though if you desigbn it well, it would be mostly out of way when its at far side
08:47 PM XXCoder: or something like that anyway
08:47 PM roycroft: so if the gantry would move, it would only be able to travel about 1/2 the length of the router table
08:47 PM XXCoder: make it so rails is under table, away from dust etc
08:47 PM roycroft: limiting me to an approximately 2'x2' cnc router
08:47 PM roycroft: i'll address that when the time comes
08:48 PM XXCoder: yep, you need length of workspace + gantry block to block length
08:48 PM XXCoder: ie if gantry is 1 foot long, then you need bed to be 5 foot to have 4'
08:48 PM roycroft: i'll have to mock something up in solidworks
08:48 PM XXCoder: width is similiar, with spindle assembly width + 2'
08:48 PM Tom_L: best to do that yes
08:48 PM Tom_L: you may find things you didn't expect
08:48 PM roycroft: solidworks can simulate motion
08:48 PM XXCoder: you can "lean" gantry back to have shorter bed
08:48 PM roycroft: yes
08:49 PM XXCoder: but only so much
08:49 PM XXCoder: and it will still move out so no real savings of space
08:50 PM roycroft: the issue with a moving bed is that it will stick out of the end of the router table most of the time when i'm making parts
08:50 PM roycroft: so i'd need some temporary clearance for that
08:50 PM XXCoder: and by a lot more than moving gantry type
08:50 PM Tom_L: always tradeoffs
08:50 PM XXCoder: yeah
08:50 PM roycroft: but it may still be the best option
08:50 PM roycroft: the router table is on casters
08:51 PM roycroft: it can live wherever it needs to when it's performing work
08:52 PM roycroft: it's either this plan or something that sits on top of the router table
08:52 PM roycroft: which is already 35+" high
08:52 PM roycroft: and if it sits on top it needs to be able to be stored fairly compactly and without a lot of hassle
08:52 PM XXCoder: yep. wonder if you can design it so bed is removable
08:52 PM roycroft: the third option is to build a new, bigger shop
08:53 PM XXCoder: so whats left is gantry thickness and easy to store
08:53 PM roycroft: which is the one option that is probably not possible
08:53 PM Tom_L: you don't want it able to jiggle around when the axis are moving either
08:53 PM roycroft: right
08:53 PM XXCoder: or find doctor who and ask to make youtr shop inside bigger ;)
08:53 PM roycroft: but i can design mounts forit
08:53 PM roycroft: maybe i'll take some classes at hogwards
08:53 PM roycroft: hogwarts
08:54 PM roycroft: i recall that hermione was able to carry a fairly huge tent inside her bag
08:55 PM roycroft: and that tiny tent that that harry et al. shared at the quiddich championship was palatial when they went inside
08:55 PM roycroft: if i could do that to my shop i'd be pretty happy
08:57 PM XXCoder: anyway why i wanted to check into shredders is because we want to evenually recycle filament and other plastics into filament
08:59 PM roycroft: you should talk to that guy from atomic filament
08:59 PM roycroft: he hangs out on #reprap
08:59 PM roycroft: i forget his nick, though
08:59 PM XXCoder: not anymore
08:59 PM roycroft: oh
08:59 PM XXCoder: crunch
08:59 PM roycroft: yeah
09:00 PM XXCoder: im looking more like how to search than what item
09:00 PM roycroft: he's not responded to my emails for a while either
09:00 PM XXCoder: i know what i want, just that im not sure how to buy one
09:00 PM roycroft: maybe his business is getting too big to spend time with the riff-raff
09:00 PM XXCoder: that or hes sick with covid
09:00 PM Tom_L: shredder?
09:00 PM XXCoder: that can take months to heal
09:00 PM XXCoder: yeah plastic shredder
09:01 PM roycroft: i ended up buying some filament from another vendor because he didn't respond to me
09:01 PM Tom_L: just use a paper shredder
09:01 PM XXCoder: like picture i linked above
09:01 PM roycroft: i just got an email with a special on bulk filament, so he's still around
09:01 PM Tom_L: i missed it
09:01 PM XXCoder: is there a way to search for this https://plasticpreneur.com/wp-content/uploads/2020/07/plasticpreneur_product_manual_granulator_detail-768x768.jpg
09:02 PM Tom_L: i bet a paper shredder would do just as well
09:02 PM Tom_L: not the ribbon kind
09:02 PM XXCoder: got example of one?
09:03 PM roycroft: i have shredders that will shred cds
09:03 PM XXCoder: problem is most 3d prints isnt that flat :)
09:03 PM roycroft: i don't know if you need to shred plastic thicker than that
09:04 PM roycroft: oh, you want to recycle your bad prints
09:04 PM roycroft: can't you just melt them down?
09:04 PM XXCoder: not really
09:04 PM XXCoder: you need to have them in grindle form to extrude new filament out of it
09:04 PM XXCoder: we do want to get filastruder and roller for it someday
09:05 PM XXCoder: https://youtu.be/HBTTbaRGmoM
09:05 PM * roycroft thinks this would be too much hassle for him, and devises a plan to not spoil many parts and just buy brand new filament from a reputable vendor
09:05 PM Tom_L: https://www.youtube.com/watch?v=_RNQFxlVQao
09:06 PM roycroft: a cunning plan mine is
09:06 PM XXCoder: roy yea but waste is never zero
09:06 PM roycroft: one i'm not sure even baldric would be able to devise
09:06 PM Tom_L: you fight moisture etc when trying to recycle it
09:07 PM XXCoder: yup we'd need to build diseccant bin for it too
09:07 PM XXCoder: use food diseccants or something
09:07 PM roycroft: i have a food dehydrator for prepping my filament spools
09:07 PM * Tom_L wonders if the cost vs buying filament is worth it
09:07 PM XXCoder: sorta. we can make unique colors
09:07 PM roycroft: that's where i'm at, tom_l
09:08 PM XXCoder: and it'll be fun we think
09:08 PM roycroft: if i can find a place to recycle spoiled parts, i would not be contributing to the waste stream
09:08 PM roycroft: although pla, which is what i primarily use, can be composted
09:08 PM roycroft: and it's made from corn
09:08 PM roycroft: so it's carbon neutral
09:08 PM XXCoder: pretty much
09:09 PM XXCoder: you need right compost setuop for pla but yeah
09:09 PM XXCoder: tom nice video
09:10 PM XXCoder: other alternate plan is melt em into blocks
09:11 PM Tom_L: what good are blocks?
09:11 PM XXCoder: dunno, print enough and we can build a house ;)
09:11 PM XXCoder: maybe can mill em using cnc router
09:12 PM XXCoder: though need a lot of cooling due to plastic being termosplastic
09:13 PM XXCoder: https://youtu.be/Dwlr2yKlq6w
09:13 PM XXCoder: awesome, but very exensive
09:14 PM roycroft: yeah, i can't compost pla in my back yard
09:14 PM roycroft: but i can send it to a place thatcan
09:15 PM roycroft: actually, i can compost it in my back yard, but it would take years
09:55 PM -!- #linuxcnc mode set to +v by ChanServ