#linuxcnc Logs

Mar 02 2020

#linuxcnc Calendar

02:05 AM Deejay: moin
02:48 AM Loetmichel: hmmmm. those chinsese cheap 8mm turning tools are crap for turning... but with some 3dprinted handle they are fine for a paint stripper ;) -> http://www.cyrom.org/palbum/main.php?g2_itemId=15901&g2_imageViewsIndex=1
02:49 AM XXCoder: gaming system at work tsk tsk
02:50 AM sensille: no time for gaming at home
02:50 AM Loetmichel: ups. wrong link. http://www.cyrom.org/palbum/main.php?g2_itemId=17721&g2_imageViewsIndex=1
03:26 AM XXCoder: jthornton: https://youtu.be/njuMsOxrBrg big cnc project. cool
03:26 AM XXCoder: something I'd want to do but smaller scale
04:55 AM veegee: Hmmm I want to get one of these https://engines.honda.com/models/model-detail/mini-4 and put a turbo on it just for fun
04:56 AM veegee: I built a 10kW constant RPM variable load controller using a generator and a block heater
04:57 AM veegee: I can precisely test its performance and see how far I can go with the boost before it blows up
04:59 AM Tom_L: morning
04:59 AM jthornton: morning
05:01 AM veegee: Actually 7HP engine for $150 CAD at princess auto: https://www.princessauto.com/en/detail/7-hp-208cc-ohv-gas-engine/A-p8445405e
05:01 AM veegee: looks like a prime candidate for experimenting
05:02 AM veegee: lets see what 1 bar of boost does
05:02 AM veegee: Going to power a 15HP industrial air compressor pump with it that can output 50 CFM at 175 PSI. Maybe I can have the compressor itself supply the boost pressure lol
05:11 AM Loetmichel: veegee: friends of mine once made a compressor out of an 1,6l 4cylinder VW "golf" gas engine... driven by a 60kW threephase motor
05:11 AM Loetmichel: THAT thing filled the 200l tank in seconds to 8 bar ;)
05:12 AM veegee: Yeah I was contemplating doing something similar but I got a great deal on a DeVilbiss 447 compressor
05:13 AM veegee: It should last several lifetimes
05:13 AM veegee: Its continuous duty lifespan rating is far higher than any petrol engine
05:13 AM jthornton: around here they just use 1/2 of a V8 as the compressor and the other half as the engine
05:15 AM veegee: Yeah still nowhere close to the lifetime of even a light industrial cast iron 2 stage compressor
05:15 AM XXCoder: hey jt
05:15 AM XXCoder: did you see video? its about guy turning wood block into moonscape
05:16 AM veegee: not nearly as efficient either
05:16 AM veegee: My 447 pump is rated at 50,000 hours before rebuild I think
05:32 AM jthornton: yea I FF through it
05:32 AM XXCoder: pretty cool isnt it :D
05:34 AM XXCoder: thats something I wanted to do
05:49 AM p0g0: Loetmichel, I have seen an aircraft piston engine that was reworked to run on half the cylinders, the other half were use to compress air to run a hard rock sandblaster.
05:49 AM p0g0: The guy who had it ran a mortuary.
05:49 AM p0g0: He did headstones for graves with it.
05:52 AM Loetmichel: hihi, nice
05:52 AM Loetmichel: the compressor on the ship i served my military time on was a 2 cylinder diesel 180°V... once cylinder diesel, the other one compressor
05:53 AM Loetmichel: and no crankshaft other than to set the thing in motion with a handcrank ;)
05:53 AM p0g0: whee
05:53 AM Loetmichel: (compressor for the diving/firefighting air bottles)
05:53 AM Loetmichel: the air always tasted slightly like diesel
05:54 AM p0g0: that's a bit scary- CO in those bottles would be a killer.
05:54 AM Loetmichel: and yes, we sued the 2*5l firefighting tanks and mask for diving ;)
05:57 AM p0g0: I once owned a UD14A International Harvester 120HP diesel power unit- it had a "special" head and extra valve set that opened to lower the PSI in the cylinders, it actually started on gasoline and once warmed up, you'd throw a lever and disengage the valves, start the diesel pump, and run on diesel. It was the size of a VW beetle, but would start on a common car battery.
06:27 AM jymmmm: Loetmichel: Mmmmm, yummy diesel taste when you need it most =)
07:49 AM Loetmichel: jymmmm: indeed
07:59 AM perry_j1987: you guys have nicer air compressors than i lol
08:12 AM Loetmichel: p0g0: i have seen old backhoes with a pony engine for the diesel
08:12 AM Loetmichel: those were fun, too
08:13 AM miss0r: scenario: Something has to be done in two days. Only one workpiece available. Me being lazy only did a contour inside two holes that had to go through the workpiece. A 2mm round center was left inside the bore... APPARENTLY! that was enough when it cammed over to move the workpeice and break the cutter & the workpiece...
08:14 AM miss0r: What a delight. I just got off the phone from the local material supplier ordering a new piece of stock :]
08:14 AM miss0r: and I am usualy realy carefull with this stuff. But this day I was a complete and utter retard.
08:46 AM methods_: https://www.vice.com/en_us/article/pkem3m/b-hind-dani-ploeger-controlling-a-robot-with-his-butthole
08:46 AM methods_: the future is here
08:49 AM gregcnc: does this mean we'll finally get a faster E-stop?
09:08 AM methods_: sphincter stop in full effect
09:15 AM methods_: i don't blame the robots for the revolt after seeing this
10:29 AM Loetmichel: maaan... last ender3 3dprinter assembled... printed a calibration cube with ootb settings. X 20.11mm Y 20.09mm, z 19.85mm. close to perfect. -> http://www.cyrom.org/palbum/main.php?g2_itemId=17727&g2_imageViewsIndex=1
11:09 AM Deejay: re
03:51 PM Deejay: gn8
05:04 PM JT-Shop: hmm expensive moen shower heads at the best dribble like an old man
05:37 PM Tom_L: heh
06:21 PM jthornton: hmm tornado watch here till 1am
06:23 PM Tom_L: haven't looked outside but it was a nice day here
06:23 PM Tom_L: bit chilly
06:24 PM Tom_L: looks like 62 for the high tomorow
06:24 PM jthornton: was ok from here to Cuba and back
06:25 PM Tom_L: yeah the radar looks a little red over by you
06:28 PM _unreal_: ve7it, just got my X axis to have powered motion
06:28 PM _unreal_: wish it was a bit faster but what ever
06:28 PM _unreal_: its VERY strong
06:28 PM ve7it: cool
06:29 PM ve7it: did you get your programmer yet?
06:32 PM _unreal_: no
06:33 PM _unreal_: ve7it, speaking of it JUST freaking shipped
06:33 PM _unreal_: it should "" be here tomorrow ""
06:33 PM _unreal_: so I'm going to assume wed.
06:34 PM ve7it: is the x axis your dual threaded rod?
06:34 PM _unreal_: no Y
06:34 PM _unreal_: I'm a little concirned
06:34 PM ve7it: ?
06:34 PM _unreal_: concerned
06:35 PM _unreal_: the X motor seems weak
06:35 PM _unreal_: the motor on the Y driving twin threaded rods spins faster and with much more power
06:35 PM _unreal_: slightly different motor but same specs
06:36 PM _unreal_: If I decide to I'll just switch it down the road
06:36 PM _unreal_: But I want to say the Y spins 1/3 faster easy
06:36 PM ve7it: if you rotate the motor pulley on x by hand, does it seem like anything is tight or binding?
06:36 PM _unreal_: no
06:37 PM _unreal_: X has less resistance
06:37 PM _unreal_: single threaded rod
06:37 PM ve7it: does your power supply show current draw.... you could compare the 2 axis motors
06:38 PM _unreal_: the motor claims the same voltage, wattage and oz/in but it also says it draws 1.5A the other motor claims 2amps
06:38 PM _unreal_: err 2.2amps
06:39 PM _unreal_: I find that odd
06:40 PM ve7it: could be wound for different rpm
06:41 PM _unreal_: Hitachi 37807 24VDC 1.5 Amp 33W Permanent Magnet Motor, 1150 RPM
06:41 PM ve7it: does your power supply show current draw?.... you could compare the 2 axis motors it may show one as "sick"
06:41 PM _unreal_: no
06:41 PM _unreal_: just using a standard china brick
06:42 PM _unreal_: ve7it, I need to come up with a filter board https://www.vishnumaiea.in/projects/hardware/diy-surge-protector-line-filter
06:42 PM _unreal_: something like that
06:42 PM _unreal_: just for the power in
06:42 PM _unreal_: to the tranformer
06:42 PM _unreal_: I have all kinds of parts
06:42 PM _unreal_: just trying o figure a design
06:43 PM _unreal_: Also I have one of these I'm going to use for My bridge http://www.irf.com/product-info/datasheets/data/63cpq100.pdf
06:43 PM ve7it: for the linear power supply I would not worry about a filter... just a fuse
06:43 PM _unreal_: :p
06:43 PM * _unreal_ wants to be special
06:44 PM _unreal_: Also I'm torn between setting the coil up as 220 or 110
06:44 PM andypugh: _unreal_: By all means make one of you want, but they are quite cheap to buy.
06:45 PM _unreal_: ve7it, what do you thik I should use for a FUSE value wise?
06:45 PM _unreal_: https://www.ebay.com/itm/500VA-20V-12-5A-20V-12-5A-40V-CT-Power-Transformer-Antek-AN-5220/371662652156?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
06:45 PM _unreal_: that is the psu I got
06:47 PM ve7it: figure it out... motors are about 2A@24V or 50W... running 3 of them is 150W... or what is your transformer rated for? use the recommended fuse to protect the transformer
06:48 PM ve7it: I would probably start at 5A for 110 and 2A for 220
06:49 PM _unreal_: if you had your choice between 220 and 110 what would you choose?
06:49 PM _unreal_: the location where I'm going to be bringing the machine I can use ether
06:49 PM ve7it: or maybe you have a little panel mount circuit breaker out of something
06:49 PM _unreal_: I am planning on using a breaker
06:50 PM ve7it: there will be a pretty good inrush when you turn it on as the caps charge
06:51 PM _unreal_: So are you thinking 110 or 220 :)
06:55 PM _unreal_: ve7it, I've been racking my brain on how I want to bleed down the caps when I turn it off
06:55 PM _unreal_: it just dawned on me. I should simply use 24V fans for the active cooling and tie those into the caps :)
06:55 PM _unreal_: they need to run regardless
06:57 PM infornography: https://www.ebay.com/itm/MOTHERBOARD-INTEL-D525MW-ATOM-1-8-GHz-DDR3-mini-ITX/153849292093
06:57 PM _unreal_: ?
06:57 PM _unreal_: infornography, ?
06:58 PM infornography: These have been working good for linuxcnc, and they are cheap
06:58 PM _unreal_: wouldnt work well for me :/
06:58 PM _unreal_: I need 50khz
06:58 PM _unreal_: par port just cant do it
07:00 PM infornography: well caveat then *for parallel port
07:00 PM _unreal_: saddly both machines I'm building it would not be a good candidate for :/
07:01 PM infornography: whataya buildin?
07:01 PM _unreal_: https://drive.google.com/open?id=1kViyHDq6daYxik7cf587PP_aZ50MCRVm
07:02 PM _unreal_: I just got X moving, this is not a current photo https://drive.google.com/open?id=1lCZMXKp_Oj-y8NpCZTpN_3a0xOpjFm3_
07:02 PM Tom_L: making progress i see
07:03 PM _unreal_: ve7it, funny thing is X is moving faster then my current machine but Y on the new build is much faster then X
07:03 PM _unreal_: on the new bild
07:03 PM _unreal_: build
07:04 PM _unreal_: ve7it, What are your thoughts on running your design on higher voltage?
07:04 PM _unreal_: ignoring the 7805
07:05 PM _unreal_: ?
07:08 PM _unreal_: brb quick shower
07:18 PM infornography: is that for milling _unreal_ ?
07:18 PM infornography: 3d printering
07:19 PM ve7it: _unreal_, I would not go higher than plus and minus 25V
07:23 PM _unreal_: much cleaner
07:23 PM _unreal_: ok
07:23 PM ve7it: _unreal_, opamp is rated for +-30, so the design is pretty much at its maximum
07:23 PM _unreal_: infornography, milling but I'm designing it with 10" plunge
07:23 PM _unreal_: so I could 3d print on it
07:24 PM _unreal_: infornography, its not all that fast though its designed for power
07:24 PM _unreal_: ve7it, ok
07:24 PM _unreal_: ve7it, I'm thinking I should wire the transformer for 22-
07:24 PM _unreal_: 220
07:25 PM _unreal_: there is an unused dedicated 220-30a line
07:25 PM _unreal_: it was for a table saw but that got moved
07:25 PM _unreal_: So I'll setup the windings for 110 for testing. and 220 final
07:25 PM ve7it: in V5 of the circuit, we tried using 2 opamps in a bridge format, but it never did function properly and was abondoned
07:26 PM _unreal_: ve7it, to up the amps?
07:26 PM ve7it: no... to be able to use 48v motors
07:26 PM _unreal_: ahh
07:27 PM ve7it: one opamp would drive to -25 and the other to +25... thus 50V across the motor... still limited to about 5 or 6 amps
07:28 PM _unreal_: ya I tried holding the X axis
07:28 PM _unreal_: testing force
07:28 PM _unreal_: hehe
07:28 PM _unreal_: even though its a bit pokey IMO nothing is going to stop that mofo from moving
07:29 PM ve7it: for a little more speed, you could change the motor pulley to a larger size if you have lots of torque unused
07:29 PM _unreal_: ya I thought about it but I do feel the motor is just weak
07:30 PM _unreal_: regardless its moving at max speed a little faster then my current machine can do
07:31 PM ve7it: yea... always fun to see what gives first... tooling, holddowns... frame, belts, motor smoke, drive smoke.... there is always a weak link!
07:31 PM _unreal_: right now I am going to claim the frame will be the weak link
07:31 PM _unreal_: or the main Y bearings setup
07:32 PM _unreal_: would be my first guess
07:32 PM _unreal_: its hard to test flex on the machine right now. its on a very flexy table :/
07:32 PM _unreal_: being built
07:32 PM _unreal_: though my working machine is a freaking brick
07:33 PM _unreal_: "in some" directions
07:33 PM ve7it: you can always reduce the drives max current output to limit the torque... then the following error check will trip the drives saving the frame
07:34 PM _unreal_: nvz, any news
07:34 PM _unreal_: ve7it, ya that is one trick I plan on doing
07:34 PM _unreal_: does the code output usage stats when conneceted via serial?
07:35 PM _unreal_: like a serial.print
07:37 PM ve7it: I dont remember... I think it is pretty quiet... serial is only used for intial setup
07:38 PM _unreal_: with out a dought need over current limits for motion and on rapids incase of issue
07:39 PM _unreal_: done anything more with the bldc's?
07:43 PM ve7it: not yet... mounting encoders is a pain
07:47 PM _unreal_: ON the motors? or part of a belt drive?
07:48 PM _unreal_: btw I just spend the past few min looking in the fridge WTF'ing over why I couldnt find the frozen stakes I put in the freezer
07:48 PM _unreal_: hehe
07:53 PM ve7it: would like the encoders on the motors, but I probably have to add a rear shaft extention and that is very finicky work
08:11 PM _unreal_: I would JUST suggest making a mount where there is an extension
08:11 PM _unreal_: and a small pully 1:1 to an encoder
08:11 PM _unreal_: very easy
08:14 PM _unreal_: ve7it, https://lh3.googleusercontent.com/proxy/RSGNeAYjC9eyWKFNb6Ht1VAZfMuQMVMSJVymATt2ki28XCJ8cOt0XCok2bC2LGgJrqUNIcod7lwGVSo1N4IDhivS9u7fghp6rlPq9Y7plq-Z-g9VSZVMOSoRuJh5
08:16 PM ve7it: that works, but my encoders dont have a shaft.. they are meant to mount on the motor and use the motor shaft to turn the disk.. saves 2 pulleys and a belts as well!
08:16 PM ve7it: just headed off to dinner... bbiab
09:22 PM _unreal_: beat ya too it :) dinner that is
09:22 PM _unreal_: LOL
09:31 PM * t4nk_freenode beats _unreal_ with his frozen dinner
10:20 PM Elmo40: t4nk_freenode, that is a waste of frozen food.
10:21 PM Elmo40: is the mashed potatos any good?
10:41 PM nyxlayne: I'm trying to fix my old setup. I need some pointers about 5i20 and Hostmot2.
11:36 PM nyxlayne: I've got the computer up and behaving again. 5i20 card has a couple of red lights on startup. How can I test my hardware?