#linuxcnc | Logs for 2018-12-04

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[03:15:49] <Deejay> moin
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[05:47:58] <jthornton> morning
[05:48:39] <XXCoder> hey jthornton
[06:00:46] <jthornton> what's up this morning?
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[06:04:45] <XXCoder> not a lot. today I worked at cell. kinda fast but still better than croach
[06:05:37] <Tom_L> morning
[06:06:05] <XXCoder> hey
[06:06:15] <XXCoder> oh and we had ice frost today
[06:06:19] <XXCoder> first for year
[06:06:32] <Tom_L> 24°F Hi 40
[06:06:37] <XXCoder> tomorrow and next few days wont even reach 40f
[06:08:27] <jthornton> we didn't get that cold last night
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[08:02:25] <weenerdog> howdy
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[08:05:53] <weenerdog> everyone must be in the shop loading up their machine and getting it choochin :)
[08:06:16] <jthornton> still down here in the beer cave programming
[08:07:40] <weenerdog> finally getting the hang of nailing things together in sw assembly. fun sidetrack. i dont hate it anymore
[08:07:44] <jthornton> and trying to get linuxcnc loaded on the pc I stole from the garage server rack
[08:09:30] <jthornton> yea once you get the hang of defining relations in the assembly it gets easy, I like to use construction lines a lot to mate with so I can move things by changing the dimension
[08:10:15] <weenerdog> i been r'in tfm on linuxcnc.org too, getting ready for that adventure.
[08:11:04] <weenerdog> yeah that was the thing lol. i was rotating parts to nowhere in particular and making a bald spot til i got relations
[08:11:40] <weenerdog> autocad it aint
[08:11:42] <methods_> relations is the hardest thing to grasp when moving from 2d cad
[08:11:56] <methods_> after you get that sorted it's much easier
[08:12:56] <weenerdog> nah i been doing 3d for 25 years. i just needed to learn sw's paradidjum fer it
[08:14:51] <weenerdog> its gonna be way more useful. especially for the manner in which i use cad.
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[08:16:54] <weenerdog> like... for years, even if i designed something stupid like a deck, i did it in 3d. had a library of lumber primitives and just sawed'em on the screen.
[08:18:16] <weenerdog> was lost without the mighty command line
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[08:28:22] <weenerdog> i'm being tempted. 2 1500mm rails, 4 bearing slides, 1605 lead screw, pillow blocks, coupling blah blah blah $157 american pesos
[08:29:16] <weenerdog> pretty much everything for a chinesium x & y for 300
[08:30:31] <weenerdog> sbr16
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[09:02:38] <jthornton> yea I think the deb is building on Linux Mint 18.3 now
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[09:08:29] <weenerdog> the deb for what?
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[09:19:23] <jthornton> linuxcnc uspace master
[09:19:48] <jthornton> looks like the preempt kernel is building now so time to hit the shower
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[09:51:04] <PLger> someone on MESA here
[09:51:30] <PLger> pcw_home: Online ?
[09:58:04] <PLger> reeboot
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[10:01:26] <jthornton> just ask your question...
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[10:37:20] <PLger> In the Forum somoeone Named Jepler is this Person here
[10:38:32] <PLger> One here has Installed Stretch DVD to Harddrive
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[13:32:55] <Tom_L> gloops how's the nose holdin up?
[13:33:15] <Tom_L> you smacked yourself a while back iirc
[13:36:26] <gloops> its just come right Tom_L, i can squeeze it and no pain, i think there was some kind of infection half of my face was throbbing and my ear, couldnt bite properly
[13:36:32] <gloops> i manned it out though
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[14:25:28] <fragalot> hi
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[15:09:33] <JT-Shop2> hi
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[15:16:25] <emsjessec> hi, anyone know of a better way of de-tabbing waterjet parts?
[15:20:46] <fragalot> compared to what?
[15:27:27] <emsjessec> using a set of plyers, and grinding the tabs off on a belt sander
[15:28:12] <emsjessec> there are two problems, breaking the parts off the sheet and removing the remnants from the freed part
[15:28:38] <emsjessec> parts can be in various shapes and sizes on a sheet
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[16:05:09] <ziper> _unreal_, you around?
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[16:26:37] <Deejay> gn8
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[17:29:53] <weenerdog> howdy
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[17:50:01] <jthornton> howdy
[17:52:32] <weenerdog> supp
[17:53:27] <jthornton> gotta clean off my table down here in the beer cave and organize my crap
[17:54:21] <weenerdog> haha right now the forecast says 8-12 inches saturday, 12+ inches sunday, 8-12 inches monday lol
[17:54:25] <jthornton> on the other hand I'm trying to figure out how to router 3 dovetails 120° apart on a chunk of wood... so far not having much luck getting the sides even
[17:54:41] <jthornton> snow I assume
[17:54:46] <weenerdog> ja
[17:54:53] <weenerdog> i've seen 4'
[17:55:03] <weenerdog> in 93
[17:55:06] <weenerdog> but 3 is a lot
[17:55:39] <jthornton> I've seen more than that but I cheat I was born in Alaska on King Salmon Island
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[17:56:48] <weenerdog> heh i'm in NC
[17:56:55] <weenerdog> i was stationed in montana
[17:57:24] <jthornton> what part of NC?
[17:57:26] <CaptHindsight> somebody make this post on mail list, maybe Russian Spy https://www.youtube.com
[17:57:47] <weenerdog> mountains. about the highest part. 4100'
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[17:58:04] <weenerdog> 30 min south of boone right on the nc/tn line
[17:58:20] <jthornton> that is a cool place in the winter :)
[17:58:55] <jthornton> grandparents and aunts/uncles lived in Greensboro, sister lives in Concord
[17:58:57] <CaptHindsight> howdo of turbine for min=-jet engines
[17:59:16] <CaptHindsight> min=/mini
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[18:02:19] <CaptHindsight> https://youtu.be looks very crudeksy
[18:11:19] <weenerdog> he's handcrankin that shit?
[18:11:27] <jthornton> weird my monitor left roswell ga went to doraville ga then back to roswell ga and won't get here until the 11th... 8 days to ship from GA is a bit bad
[18:11:40] <andypugh> Results are simutaneously horrible and impressive
[18:12:15] <weenerdog> A for effort
[18:12:49] <CaptHindsight> https://www.youtube.com
[18:13:04] <CaptHindsight> homemade RC sized Turbo-Jet
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[18:18:05] <CaptHindsight> https://youtu.be
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[18:19:39] <CaptHindsight> https://youtu.be
[18:22:11] <andypugh> Oh UPS how I hate you!
[18:22:36] <andypugh> UPS have my package, they have posted a note through the door saying i was out.
[18:22:41] <CaptHindsight> and a bad time of year as well for shipping anything
[18:23:15] <CaptHindsight> was you home?
[18:23:26] <andypugh> But, after creating an unnecessary “UPS MyChoice” account in order to reschedule delivery they deny that I have any packages due to be delivered.
[18:23:58] <CaptHindsight> nice
[18:23:59] <andypugh> I have no idea how they link packages to customers, but clearly badly.
[18:24:54] <CaptHindsight> your Parcel Farce is worse from my experience
[18:24:59] <andypugh> No option to enter tracking or “infonotice” numbers in to the system
[18:25:35] <jthornton> do you have the tracking number?
[18:25:47] <CaptHindsight> they could not deliver a parcel to a business that had an entire street named after the business
[18:26:10] <CaptHindsight> anywhere on the street would have been fine
[18:26:42] <andypugh> I can (sometimes) get to a button in the “tracking” section that lets me enter an “infonotice” number, but that then tells me “please fix the following error: Our system is temporarily unavailable”. Surely it is their job to fix that error, not mine?
[18:27:10] <andypugh> jthornton: Yes, I have been tracking the package since it left the US
[18:27:35] <jthornton> it took me an hour yesterday to pay a UPS bill, it kept telling me it was broken
[18:28:09] <andypugh> It’s the most horrible web site, what you see in the tracking screens seems to depend on the route you took through the site to get there. And none of it seems to really work.
[18:28:37] <CaptHindsight> yeah UPS websites are often broken
[18:28:44] <andypugh> (Packages still show as due for delivery today, but today ends in 30 mins, and they already posted the card)
[18:28:55] <CaptHindsight> I only have a freight account with them
[18:29:29] <CaptHindsight> will probably track more accurately in 12+ hours
[18:30:12] <andypugh> Yes, but in 12 hours they will have, once again, found me out at work rather than at home.
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[18:31:42] <CaptHindsight> of course, i waited for a package the Wednesday before Thanksgiving, they missed us by knocking silently then not retrying delivery until Monday vs the next business day FRIDAY
[18:31:56] <CaptHindsight> loads of fun
[18:34:51] <jthornton> signature required?
[18:35:28] <andypugh> Mine? Probably. Shipping alone cost ÂŁ270
[18:35:46] <jthornton> ouch
[18:35:46] <andypugh> (It’s my Faro arm)
[18:36:09] <jthornton> what is a Faro arm?
[18:36:26] <andypugh> It’s an Arm made by Faro :-)
[18:37:49] <jthornton> a digitizing arm?
[18:37:52] <andypugh> Yes
[18:44:17] <_unreal_> _unreal_
[18:44:35] <_unreal_> ziper, yes?
[18:47:17] <CaptHindsight> https://www.faro.com
[18:49:33] <andypugh> Mine is much older, of course. And if I had known how much shipping would be I wouldn’t have bothered
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[19:12:22] <_unreal_> do any of you guys know of cheap unipolar stepper motor drivers like the A4988's for example?
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[19:15:55] <andypugh> Why do you want unpolar?
[19:17:19] <CaptHindsight> https://www.pololu.com
[19:17:45] <CaptHindsight> selection of CHEAP
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[19:22:07] <Rab> _unreal_, here's a board based on the SLA7078MPR: https://www.ebay.com
[19:23:00] <Rab> There are other chips like the DRV8805, but I'm not aware of any cheap breakout boards.
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[19:25:11] <CaptHindsight> Rab: did you see my link above?
[19:25:24] <CaptHindsight> it's got a bunch of boards
[19:25:45] <Tom_L> andypugh what are you gonna 3d digitize?
[19:26:35] <Tom_L> well nothing... until you get it..
[19:28:27] <Rab> CaptHindsight, I did. Do any of those support unipolar steppers?
[19:29:29] <andypugh> Tom_L: I want it for measuring thinkgs like critical points on the area where the radiator mounts on the fire engine. That sort of reverse-engineering. PLus I want to play around with kinematics.
[19:29:56] <Tom_L> fun
[19:30:40] <andypugh> _unreal_: I repeat: Why do you want unipolar drivers? You can drive any stepper motor with a bipolar driver by ignoring some wires.
[19:30:47] <CaptHindsight> Rab: yes, since "like" was the word he used
[19:30:52] <andypugh> (and the stepper will perform better)
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[19:32:32] <CaptHindsight> I think he's keeping us in suspense
[19:33:00] <CaptHindsight> _unreal_: are you still there?
[19:34:29] <Tom_L> how many decimal places do you typically use in a metric gcode file?
[19:34:40] <Tom_L> i want to make a metric post for my cam
[19:34:51] <Tom_L> i'm using 3.4 for linear and 3.2 for angular in inchi would imagine in mm you would need more in front of the decimal like 4.3 or maybe even 5.3
[19:35:12] <Tom_L> 0000.000
[19:47:18] <CaptHindsight> https://www.youtube.com Circle Cycle engine
[19:47:48] <CaptHindsight> https://www.youtube.com running
[19:55:28] <andypugh> Tom_L: Any reason not to use 4.4 ? It’s excessive, but so what. only the nterpreter sees the G-code
[19:55:47] <Tom_L> no, just not that familiar with metric format
[19:55:58] <Tom_L> that's why i asked :)
[19:57:56] <Tom_L> that could go all sorts of wrong if those pistons got mis'aligned
[19:58:50] <sync> andypugh: you could just have told me
[19:59:01] <_unreal_> hi
[19:59:19] <_unreal_> baaa $60
[19:59:36] <_unreal_> was looking for the $6 ish at most $ boards
[19:59:51] <_unreal_> kills me everything has gone bipolar
[20:00:09] <andypugh> Can you explain what your objection is to bipolar?
[20:00:16] <_unreal_> andypugh, only because I have a CNC machine I built that has very nice unipolar motors on it...
[20:00:26] <_unreal_> I have the drivers I an just slugish to build the PCB's
[20:00:26] <andypugh> Do you have some kind of bipolar disorder?
[20:00:35] <_unreal_> MAYBE :)
[20:00:54] <andypugh> There’s no such thing as a bipolar stepper motor
[20:01:18] <_unreal_> I've had 2 beers so far "shock top belgian white" and now working on a large martini
[20:01:22] <andypugh> Sorry, I mean there is no such thing as an _exclusively_ _unipolar_ stepper motor
[20:01:32] <_unreal_> yes there is
[20:01:34] <_unreal_> 5 wire
[20:02:01] <andypugh> Well, apart from that…
[20:02:07] <_unreal_> .....
[20:02:41] <_unreal_> Rab, I thought drv8805 is bipolar?
[20:02:53] <andypugh> I read somewhere that any motor could be run bipolar, and I have only ever seen 4 6 or 8.
[20:03:07] <SpeedEvil> andypugh: switched reluctance?
[20:03:15] <_unreal_> andypugh, I have a small hand full of step-syn unipolar steppers....
[20:03:15] <andypugh> But yes, if it really is 4 phases and a common, then that’s pretty much dedicated unipolar.
[20:03:37] <_unreal_> there equals in bipolar motors are like $40 each easy
[20:04:03] <_unreal_> they are all 400+ oz'inch
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[20:04:45] <andypugh> Have you considered taking the back cover off to see if there is an obvious way to separate the phases at the common wire?
[20:04:48] <_unreal_> I'm kind of stuck in a bleep spot. though the CNC machine I'm SLOOOOOOOOOOWly working on is using bipolar. the one I'm talking about currently is a home machine
[20:04:55] <_unreal_> no way
[20:05:06] <_unreal_> to much risk of killing the MAG...
[20:05:12] <_unreal_> and loosing power
[20:05:23] <_unreal_> never EVER take apart a stepper.
[20:05:24] <andypugh> Of all the possible motot mods, splitting at the common seems about as easy as it gets.
[20:05:50] <andypugh> You can take the back off, as long as you leave the rotor in place.
[20:06:02] <_unreal_> you DONT take the risk.... if the core goes out of field. it kills the mag field for ever
[20:06:19] <_unreal_> out of field is just 1 degree
[20:06:25] <andypugh> Yes, so don’t take the rotor out
[20:06:31] <_unreal_> that is TILT
[20:06:57] <andypugh> <not convinced>
[20:07:17] <_unreal_> Wow 1lb no rinse sanatizer for home brew $7 amazon
[20:07:29] <andypugh> Anyway… Sleep
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[20:07:36] <_unreal_> I do a lot of home brew
[20:08:02] * _unreal_ goes wide eyed.... I've tried just opening a motor before a lost a lot of power... NEVER again
[20:08:11] <_unreal_> a=and
[20:08:36] <_unreal_> I killed a nice set of steppers doing that...... never let my self get over it
[20:16:42] <sync> _unreal_: it really depends on which kind of magnets you have in there
[20:16:54] <sync> most newer ones you cannot kill anymore
[20:17:06] <sync> well "kill", only the torque constant will be lower
[20:23:12] <_unreal_> as far as I am concerned loss is KILL
[20:23:27] <_unreal_> if it does not match the lable its been killed
[20:25:48] <sync> pfft
[20:26:09] <sync> so what, it's legacy anyway
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[20:43:41] <ziper> _unreal_, i have a plug I want to use, but the surface finish sucks. any reason I can't just drape it in release film
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[22:06:20] <_unreal_> gu
[22:06:21] <_unreal_> hi
[22:06:41] <_unreal_> ziper, I dont know just had bad the surface finish sucks
[22:07:12] <_unreal_> I need details... and NO there is no reason you cant but with out providing a few more details my responces are limited...
[22:07:22] <_unreal_> got I fee like irobot :)
[22:07:24] <_unreal_> god
[22:19:51] <_unreal_> ziper, long/and the short of it.. depending on what you need/want for a finish or what is acceptable... if your building a PLUG that is a one off that your likely to kill... depends on what you need want..... if you dont need a perfect finish. you could easly wrap it with a PEELPLY or use 2" blue tape the 2020 I believe... the resin resistant tape.... and then wax it with green wax.........
[22:20:34] <_unreal_> there are a lot of options available... it really depends on what is it that you need and or what you need for minimums... in regards to finish quality..
[22:20:36] <ziper> I have a plug that I want to take a female off of
[22:20:50] <ziper> I'll make two products from the single mold
[22:21:07] <_unreal_> back in 5 at most.. putting my daughter to bed..... yes its late
[22:24:21] <_unreal_> ok tickled the hell out of my daughter :)
[22:24:38] <_unreal_> i?
[22:24:41] <_unreal_> ?
[22:24:44] <_unreal_> got photos
[22:25:11] <_unreal_> 2 products from the same mold has me saying whaaa?
[22:25:55] <ziper> https://www.thebeachcats.com
[22:26:01] <ziper> see the plastic hatch?
[22:26:18] <ziper> I want to take a mold off that, and also put a seat in it
[22:26:42] <ziper> like this https://sailstiletto.com
[22:26:44] <_unreal_> plastic hatch or plastic DARK windshield?
[22:27:30] <ziper> it doesnt need to be seethru
[22:28:17] <_unreal_> ok.... so wax the hell out of it. and mold it with epoxy.
[22:28:23] <_unreal_> epoxy and boat cloth
[22:29:21] <_unreal_> you can mold anything as long as its not going to chemically react
[22:29:24] <ziper> why not junk resin
[22:29:37] <_unreal_> as in VE? OR poly?
[22:30:08] <ziper> cheap poly
[22:30:10] <_unreal_> or are you talking more like swill gelcoat/ve-poly
[22:30:19] <_unreal_> what ever
[22:30:37] <_unreal_> as LONG as its not going to attact it chemically
[22:30:39] <_unreal_> I dont know
[22:30:55] <_unreal_> i"m just looking at a photo
[22:31:48] <ziper> its lexan or PMMA or whatever
[22:31:53] <_unreal_> most plastics will not tolerate acetone. if it cant take acetone be careful with ve/poly on it... they may react
[22:32:01] <_unreal_> again I dont know I'd suggest looking it up
[22:32:14] <_unreal_> You can always also wax/PVA to be on the safe side
[22:32:21] <_unreal_> poly vynal acetate
[22:33:02] <ziper> but is there any reason I can't skip that crap and just drape it in vacuum bang and peel ply?
[22:33:27] <_unreal_> if you dont mind risking messing up the original...
[22:33:37] <_unreal_> I would always use a release agent
[22:33:53] <_unreal_> hell mold release 818
[22:34:24] <_unreal_> https://www.grp-solutions.com
[22:34:31] <ziper> oh, the old one is all dinged up, thats why the surface finish sucks, from old repairs
[22:34:35] <_unreal_> USE a resperator with this stuff
[22:34:57] <_unreal_> ya but you have a STRONG chance of bonding if not using a release
[22:35:08] <_unreal_> or having to CHIP out the old form....
[22:35:11] <_unreal_> and loosing it
[22:35:27] <ziper> is there any reason to use the old style wax instead of that wipe on stuff like that?
[22:35:32] <_unreal_> you can always use clay to fill in scratches etc...
[22:35:59] <_unreal_> That is one question I'm not 100% sure about
[22:36:04] <_unreal_> nice question
[22:36:47] <_unreal_> I would assume that the wax will do a better job then a wipe on mold release
[22:36:58] <_unreal_> as far as being a chemcial barrier
[22:37:31] <_unreal_> but dont quote me on that.... again PVA is the kind chumb chumb of barriers
[22:37:41] <_unreal_> kind=king
[22:38:15] <ziper> i have no idea what chumb chumb means lol
[22:38:27] <_unreal_> chum chum
[22:38:35] <_unreal_> chum=chump
[22:38:52] <_unreal_> typically stated as chum
[22:39:20] <ziper> whats the deal with making gasoline tanks?
[22:39:34] <ziper> no epoxy?
[22:40:02] <_unreal_> king chum chum. must be a Maine thing.
[22:40:34] <_unreal_> can be VE or epoxy... but often finished with a custom epoxy resin liner
[22:40:52] <_unreal_> also depends are you talking GAS or diesel?
[22:40:56] <ziper> gasoline
[22:41:14] <ziper> the one i'm thinking about making is about 5 gallons, custom shape and size
[22:41:27] <_unreal_> gas is typically done with a special epoxy ligner resin
[22:41:58] <ziper> easy enough to just build it and slosh it around inside, no?
[22:42:32] <_unreal_> ya if its personal the reason does not matter much... but most fuel tanks are done with a special fuel grate epoxy... NOT for glass layup but to seal. period
[22:43:01] <_unreal_> depends on the viscosity so yes/noe
[22:43:02] <_unreal_> no
[23:16:08] <roycroft> the folks who make por-15 make a gas tank liner that works brilliantly
[23:17:24] <roycroft> i've used it on several volkswagen fuel tanks that were decades old and not in the best shape
[23:17:53] <roycroft> i take them to a radiator shop to have them boiled out, then i slosh the por-15 sealer around the inside and paint the outside
[23:17:59] <roycroft> https://www.por15.com
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[23:26:37] <sync> yeah that stuff works well
[23:26:53] <sync> although I had it fail for whatever reason once
[23:30:47] <roycroft> the tank needs to be squeaky clean for it to work
[23:31:00] <roycroft> i've always used it right after getting a tank back from being boiled out
[23:31:17] <roycroft> i don't always paint the outside right away, but i always use the por-15 immediately
[23:32:02] <sync> yeah, I etched the inside like I always do with phosphoric acid but it did not work
[23:32:14] <sync> another tank I did together with it is still fine
[23:32:23] <roycroft> there might have been some contaminant that the phosphoric acid cold not remove
[23:32:35] <roycroft> maybe a silicone based sealant
[23:32:51] <sync> maybe, but unlikely
[23:34:23] <sync> I did it again after I stripped it out and it worked
[23:34:27] <sync> idk
[23:36:56] <sync> I should possibly start being more aggressive with the cleaning agents
[23:37:07] <sync> so far I only use KOH + phosphoric
[23:39:10] <ziper> does that need metal to bond to or is it plastic?
[23:44:15] <sync> it's just some epoxy
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[23:56:15] <ziper> sweet