#garfield Logs

Oct 18 2018

01:00 AM rue_mohr: --
04:39 PM Tom_L: https://www.youtube.com/watch?v=onTUVlev8iY
05:32 PM zhanx: rue_mohr, no
05:32 PM zhanx: I need to but
05:32 PM zhanx: I made a flower pot heater to test it out. 10 bucks
05:32 PM zhanx: it works good
06:57 PM zhanx: ok put a 2L flask on top to see if it can be boiled
06:57 PM zhanx: started at 58 degree's 5 minutes ago. is at 64 already
06:59 PM zhanx: base is 241 degrees so it might work
07:04 PM rue_mohr: zhanx, yes, my next machine will be a paste extruder
07:04 PM zhanx: k
07:04 PM zhanx: I am working on heat for the shop right now
07:04 PM zhanx: kind of need it
07:05 PM zhanx: pushing 72 degrees now
09:03 PM zhanx: well that stopped at 164 degrees
09:03 PM zhanx: gives me hope
10:05 PM rue_mohr: ?
10:05 PM zhanx: 31 outside
10:06 PM zhanx: my makeshift thing is keeping it 64 in here over all
10:06 PM rue_mohr: ok
10:06 PM zhanx: when I get home tomorrow i can upgrade it
10:06 PM rue_mohr: I might stick some load resistors in the shop on the unused panels I have
10:06 PM rue_mohr: or the house, not sure
10:06 PM zhanx: I have a radiator to put in
10:06 PM rue_mohr: 500w or so for a few hours a day
10:07 PM zhanx: that is next solar power the pump
10:07 PM rue_mohr: I cant find pipes to link the runs in my radiators
10:07 PM rue_mohr: back to supper and motif I suppose
10:08 PM zhanx: going to run pex tube on it
10:08 PM rue_mohr: at this point, I'm not sure if motif is easier than working with X directly or not
10:08 PM zhanx: not
10:08 PM rue_mohr: I have to just about make everything anyhow
10:08 PM zhanx: opencv is easy
10:10 PM rue_mohr: ok, I need a gui tho
10:10 PM rue_mohr: one that I can do from C
10:10 PM zhanx: k
10:10 PM zhanx: basic right?
10:11 PM rue_mohr: so far I ahve a window with 24 bit color
10:11 PM zhanx: i have "11 hours" of work tomorrow,
10:12 PM zhanx: monday i am off, wife is getting a new transmission in her car, so taking mine
10:12 PM rue_mohr: isn't that her 3rd one?
10:12 PM rue_mohr: 4th wiper mtor?
10:13 PM zhanx: no this is the new one that was bad, she drives like i code
10:14 PM zhanx: its all wheel drive and the all wheel part failed, its 2wd right now
10:19 PM furrywolf: http://fw.bushytails.net/img/img.php/phone/101818/ shitty, sideways pics of tonight's project.
10:23 PM rue_mohr: sideways is fine with me
10:24 PM rue_mohr: oh hey, nice
10:24 PM rue_mohr: what did you use to control it?
10:24 PM rue_mohr: (its called a retorical question)
10:25 PM rue_mohr: screw drive, funny, most of those machnes are rack
10:25 PM rue_mohr: the screws flop around too much at high speed
10:25 PM furrywolf: yeah, and the 9ft screw fucking sucks. it flops around like crazy above 1inch/second...
10:25 PM rue_mohr: whats why I designed a system for larger mcahiens that spins the nut
10:25 PM furrywolf: to the point where it would damage itself if I let it.
10:26 PM furrywolf: the Y screw also flops, but not as badly.
10:26 PM zhanx: heat it
10:26 PM rue_mohr: your cpu looked underpowered, are the geckos multicore?
10:27 PM furrywolf: huh?
10:27 PM rue_mohr: is it a diy machine? is THAT commercial!?!?!
10:27 PM furrywolf: it's a DIY machine. I bought it for $200.
10:27 PM rue_mohr: oh, that ok then
10:28 PM rue_mohr: a commercial machine would be painted and have cowlings
10:28 PM Tom_L: odd they run double rails like that
10:28 PM rue_mohr: and not use 10' ball screws
10:28 PM furrywolf: the biggest problem is the non-driven side of the gantry, with just two little bearings as rollers and no drive, flops all fucking over the place.
10:28 PM furrywolf: it needs re-engineering
10:28 PM rue_mohr: waaaait
10:29 PM rue_mohr: waaaait
10:29 PM rue_mohr: you mean there is only a leadscrew on ONE side!?!?!?!
10:29 PM furrywolf: yep
10:29 PM rue_mohr: hahaha
10:29 PM rue_mohr: well it needs to be a rack drive anyhow
10:30 PM rue_mohr: linuxcnc does not do cam tho does it?
10:30 PM furrywolf: my first thought is to use a big loop of wire rope and a bunch of idler pullies, to force the two sides to move in sync.
10:30 PM Tom_L: some
10:30 PM Tom_L: simple shapes
10:30 PM rue_mohr: furrywolf, no, fix both problems and change it to a rack drive at the same time
10:30 PM furrywolf: I'm out of money.
10:31 PM rue_mohr: Tom_L, not dxf profiles?
10:31 PM Tom_L: i dunno
10:31 PM rue_mohr: furrywolf, pfff money, you have a drillpress and a cnc machine
10:31 PM Tom_L: i think it's got dxf to gcode or something
10:31 PM Tom_L: i've never used or looked at it
10:31 PM Tom_L: what did you drive the router with?
10:32 PM rue_mohr: hah is the U all mauled up from how much it moved when it plunged?
10:32 PM rue_mohr: and the C
10:32 PM rue_mohr: oooh, now I want to make one
10:32 PM rue_mohr: THANKS FURRY
10:33 PM rue_mohr: furrywolf, of course, those gecko drives alone are probably worth more than $200
10:34 PM Tom_L: that's funny, i've never run that program
10:34 PM Tom_L: yeah those are nice drivers
10:34 PM furrywolf: Tom_L: it says it's not meant for actual cutting, but it's a perfectly valid program. :)
10:34 PM rue_mohr: and that looks like atleast a $150 router
10:34 PM Tom_L: just about everybody i've seen that built one ran it
10:35 PM Tom_L: alot used a pencil
10:35 PM rue_mohr: furrywolf, so, the frame is 2" tube steel?
10:35 PM furrywolf: box steel
10:35 PM rue_mohr: 2"?
10:35 PM rue_mohr: 2.5"
10:35 PM rue_mohr: 3"?
10:36 PM Tom_L: my frame is 2" thickwall and the column is 4"
10:36 PM Tom_L: sounds like a decent start to a cnc
10:36 PM rue_mohr: furrywolf, did you do distance calibration?
10:36 PM rue_mohr: yea, its soemthing to work from
10:37 PM furrywolf: no calibration other than "looks about right"
10:37 PM rue_mohr: I'd have paid it
10:37 PM Tom_L: needs to fix the Y axis
10:37 PM Tom_L: or maybe that's X
10:37 PM Tom_L: the gantry
10:37 PM rue_mohr: I suspect the z needs work,
10:37 PM furrywolf: the long axis is labeled Y on the drivers, but I set it up as X.
10:37 PM furrywolf: Z works great.
10:38 PM zhanx: of course i do
10:38 PM rue_mohr: what is moving when it plunges?
10:38 PM Tom_L: did you wire it up to a mesa card?
10:38 PM rue_mohr: furrywolf, people pay a lot for arcade cabinets
10:38 PM furrywolf: the gantry is flopping in every way, because one side just floats
10:38 PM furrywolf: all of the issues are due to the undriven, poorly supported side of the gantry
10:39 PM zhanx: can i have a thought on not rebuilding it all?
10:39 PM furrywolf: Tom_L: no, just a chinese parallel port board.
10:39 PM rue_mohr: yea, I think you will find that the screw drives push your patience past any limits
10:39 PM rue_mohr: mine did
10:40 PM furrywolf: the screw drive sucks, but only having one drive is a far bigger issue
10:40 PM rue_mohr: I should persue dc servo drives with stepper interfaces again (yes, I know gecko does that)
10:40 PM rue_mohr: agreed
10:40 PM zhanx: ok guess not
10:40 PM rue_mohr: is it a ball screw?
10:40 PM furrywolf: no
10:40 PM zhanx: you can float it on magnets
10:40 PM rue_mohr: oh, its just threaded rod?
10:41 PM rue_mohr: zhanx, to hold it steady?
10:41 PM furrywolf: I'm not sure what's up with the Z axis... I computed the steps/inch wrong the first time, by a factor of two. either the motor is only 100 steps/rev or that drive is only 5 ustep/step while the others are 10ustep/step.
10:41 PM rue_mohr: zhanx, you gonna give me a opencv tutorial this weekend?
10:41 PM furrywolf: it works great, but I don't know why it didn't move the amount I expected it would.
10:41 PM zhanx: yes electromagnetic
10:41 PM furrywolf: the fun of used stuff.
10:42 PM zhanx: rue_mohr, if i can yes
10:42 PM furrywolf: the parallel port step generation rate turns out to not be the limiting factor... the machine fails before the parallel port is maxxed out.
10:42 PM rue_mohr: I have a scrap computer in the spare bedroom I can do "anything" to
10:42 PM rue_mohr: furrywolf, the power ratio is wrong
10:43 PM furrywolf: I lose steps on Y or the leadscrew tries to rip the machine apart on X before running out of step rate.
10:43 PM rue_mohr: the drives need more speed than torque compared to the motors
10:43 PM Tom_L: i wondered about that long screw whipping around
10:43 PM rue_mohr: thats why I have the axies of my 3d printers 2:1
10:43 PM rue_mohr: yea, thats crazy long
10:44 PM rue_mohr: like I say, I'd never try to do that, I'd spin the nut
10:44 PM furrywolf: I have to keep the speeds slow, or plan on adding some kind of overly complicated shock absorbing systems.... which would be more work than using some other drive system.
10:45 PM furrywolf: but, that's a tiny problem compared to the lack of drive on the other side. it is _not_ usable as it is.
10:45 PM furrywolf: those horrid cuts were on the _good_ side of the table.
10:45 PM rue_mohr: arg, you guys distracted me and I fried my wiener!...
10:45 PM furrywolf: that is, closest to the driven side of the gantry
10:45 PM rue_mohr: I hate eating
10:46 PM Tom_L: i would too if i ate burnt food all the time
10:46 PM rue_mohr: furrywolf, so, cable system first?
10:46 PM rue_mohr: is the gantry otherwise ridgid?
10:47 PM furrywolf: the gantry is well-designed otherwise, yes. decent extrusions, and the driven side is something like 3/4" aluminum plate.
10:47 PM rue_mohr: furrywolf, how are you at making fake positioning beacons for planes? I know a way you can get lots of free aircraft cable...
10:47 PM furrywolf: lol
10:47 PM rue_mohr: whats the actual table width?
10:48 PM furrywolf: about 4.5ft cutting area
10:48 PM rue_mohr: and how the hell you gonna get the vehicles out tommorow morning?
10:48 PM furrywolf: those aren't my vehicles... it's in someone else's lot because I have no room for it. it'll eventually go in their barn.
10:48 PM furrywolf: also, none of those move, nor do the other dozen or so not in the photos. :P
10:48 PM rue_mohr: oh, so you dont ahve to move it tonight with your bad back
10:49 PM furrywolf: it's not here. and I'm already back home.
10:49 PM rue_mohr: your not here your there
10:49 PM rue_mohr: I see
10:49 PM rue_mohr: there here not here here
10:49 PM rue_mohr: there
10:50 PM furrywolf: the machine definitely needs work, but hey, it was $200 and it cuts.
10:50 PM rue_mohr: I'm worried tho, can you trust the people housing it will not run off with it on you?
10:50 PM furrywolf: yes
10:51 PM furrywolf: they just "borrow" things, and then go "hey, you can come over and use it any time you want!"
10:51 PM rue_mohr: I'v seem amchine like that where the gantry goes under the table, and the single drive point is in the middle, but I cant imagine its any better
10:51 PM Tom_L: i was gonna suggest that as a possibility
10:52 PM rue_mohr: it'd still need a tracking arrangement
10:54 PM furrywolf: the cheapest fix I can think of is the cable loops... it'll be ugly, but I believe it will work well. switching to dual rack drive or such would greatly exceed my budget.
10:55 PM rue_mohr: you dont know about using a tap to make a pinion to use threaded rod as a rack?
10:56 PM furrywolf: that sounds shitty.
10:56 PM rue_mohr: ? no
10:56 PM furrywolf: also, hardware store threaded rod isn't exactly precise...
10:57 PM rue_mohr: its pretty close
10:57 PM rue_mohr: its definitly beyond the play in the machine
10:57 PM furrywolf: you sure? I've bought hardware store screws where the pitch was so bad you could barely get a nut onto them...
10:58 PM rue_mohr: well, I'm in canada, maybe its different
10:58 PM furrywolf: I'm assuming to make the pinion, you just use the tap to hob a tool steel blank, then harden it?
11:00 PM rue_mohr: steel?
11:00 PM furrywolf: ?
11:00 PM rue_mohr: you make a U groove in the blank first
11:01 PM rue_mohr: take a bit to get the radius right
11:01 PM furrywolf: that would be the blank, yes.
11:01 PM furrywolf: and then, I'm assuming, you hob it.
11:04 PM rue_mohr: you rotary thread it
11:04 PM rue_mohr: deeper than a hobb
11:05 PM furrywolf: I'm not sure what rotary threading is, or how it differs from hobbing.
11:07 PM rue_mohr: its liek hobbingm, but you let the blank spin freely and feed the tap into it
11:07 PM furrywolf: so... just like hobbing? :P
11:09 PM rue_mohr: no
11:09 PM rue_mohr: hobbing isn't full tap depth
11:09 PM rue_mohr: its rotary threading
11:09 PM rue_mohr: and its done on a drillpress
11:10 PM rue_mohr: which, you can make the blank on too
11:10 PM furrywolf: ... hobbing can turn a part from a cylinder all the way to its finished dimensions. hobbing is how gears are cut.
11:10 PM furrywolf: also, google says rotary threading isn't even a thing, which would explain why I've never heard of it. :P
11:12 PM furrywolf: I do believe the term you want is "hobbing". :P
11:19 PM rue_mohr: google dosn't really know about saturable reactors either
11:29 PM rue_mohr: or magnetic shunts
11:29 PM rue_mohr: ok I ahve 15 mins left to live