#linuxcnc | Logs for 2014-06-15

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[01:57:15] <Deejay> moin
[01:57:42] <Jymmm> ug
[01:59:28] <Deejay> hi jymmm
[02:01:51] <archivist> zeeshan|2, yes, made some replacement plastic gears for someone
[02:02:45] <archivist> was while the machine was still 4 axis http://www.collection.archivist.info/searchv13.php?searchstr=cnc+helical
[03:04:58] <zeeshan|2> archivist: how the heck do you even inspect them after :P
[03:06:38] <archivist> in that case it is a simple one that I just compared to the original
[03:06:44] <zeeshan|2> i see
[03:06:52] <zeeshan|2> sometime by the end of this year
[03:06:59] <zeeshan|2> i'd like to start producing some metal helical gears
[03:07:01] <zeeshan|2> for transmissions
[03:07:10] <archivist> for a lot of stuff the tolerance is wider than you may be expecting
[03:07:24] <zeeshan|2> for car stuff
[03:07:30] <zeeshan|2> i can only persume the tolerances are tight
[03:07:43] <archivist> very tight
[03:08:08] <zeeshan|2> so to do this, i'd need to have at least a 4 axis
[03:08:12] <zeeshan|2> and some way to inspect
[03:08:17] <zeeshan|2> i need to research it more :P
[03:08:42] <archivist> hob them, not sure if some production is ground
[03:08:57] <zeeshan|2> hob might get expensive
[03:09:03] <zeeshan|2> cause of the different ratios
[03:09:16] <zeeshan|2> honestly, i should prolly say fuck it to helical gears
[03:09:19] <zeeshan|2> and just make straight cut gears
[03:09:27] <zeeshan|2> helical gears are stronger
[03:09:35] <zeeshan|2> but i can just make the face width of the straight cut gears wider
[03:09:39] <archivist> hob is generation you dont care what the ratio is
[03:09:39] <zeeshan|2> and just deal with the noise
[03:10:41] <archivist> you can mill helical should be quieter than milled straight
[03:11:03] <zeeshan|2> http://www.practicalmachinist.com/vb/attachments/f38/26946d1286581656-help-gear-hobbing-helical-gear-pictures-062small.jpg
[03:11:03] <archivist> linuxcnc can hob too
[03:11:06] <zeeshan|2> you're saying something like that
[03:11:07] <zeeshan|2> right?
[03:11:11] <zeeshan|2> just hob at an angle
[03:11:50] <archivist> yes and gear the spindles together
[03:12:27] <archivist> one also has the lead to add into the rotation with distance cut
[03:12:46] <zeeshan|2> here's another thing
[03:12:46] <zeeshan|2> http://valuablemechanisms.files.wordpress.com/2010/05/bevel-gears.png
[03:12:50] <zeeshan|2> if iwanna make bevel gears
[03:12:54] <zeeshan|2> can it be done on a 4 axis?
[03:13:35] <zeeshan|2> gear machining interests me :)
[03:13:40] <archivist> probably but the maths is....
[03:14:12] <archivist> I have not fully cracked straight generated bevels
[03:14:38] <zeeshan|2> the pinion looks hard to make
[03:14:47] <zeeshan|2> cause of the way the teeth curve
[03:14:55] <zeeshan|2> the ring gear seems fairly standard
[03:15:00] <zeeshan|2> something that you can do using a 3 axis
[03:15:16] <zeeshan|2> http://www.iwasa-tech.com/product/img/DSC_0515.jpg
[03:15:20] <zeeshan|2> looks like they use a bull nose cutter
[03:15:25] <zeeshan|2> ball nose cutter
[03:15:53] <Loetmichel> when i can make threads on a chinese 6040 you sure can make bevel gears on your machine.
[03:16:35] <archivist> zeeshan|2, that is probably only the gashing stage
[03:17:32] <archivist> the maths http://www.archivist.info/gear/designbevel.php
[03:17:51] <zeeshan|2> rofl
[03:18:05] <zeeshan|2> the gears i wanna make arent even straight
[03:18:08] <zeeshan|2> they're offset
[03:18:11] <archivist> I know
[03:18:27] <zeeshan|2> looks like a pain
[03:18:48] <zeeshan|2> but fun
[03:19:17] <archivist> they build the maths into the machine, and have some near enough parts
[03:20:11] <archivist> the spiral gears are made with special cutters, look at youtube
[03:21:00] <zeeshan|2> http://www.youtube.com/watch?v=8aUQM-VtElo
[03:21:06] <zeeshan|2> this guy seems to be using just a slitting saw
[03:21:07] <zeeshan|2> lol
[03:21:14] <zeeshan|2> sparks flying everywhere
[03:21:54] <zeeshan|2> purely mechanical system
[03:21:55] <zeeshan|2> fancy
[03:22:16] <Loetmichel> more like a flycutter than a slitting saw
[03:22:22] <archivist> flycutter
[03:22:33] <zeeshan|2> whoops
[03:22:34] <zeeshan|2> =D
[03:22:39] <Loetmichel> i would think: with the tooth for gound into it
[03:22:41] <Loetmichel> form
[03:23:04] <zeeshan|2> okay on this note
[03:23:05] <Loetmichel> ground
[03:23:05] <zeeshan|2> its bed time
[03:23:07] <zeeshan|2> 4am :{
[03:23:09] <zeeshan|2> gnite!
[03:23:10] <archivist> but the form should be changing along the gear
[03:23:23] <Loetmichel> maybe he compromized?
[03:23:49] <archivist> there are often compromises
[04:18:03] <Jymmm> archivist: http://codeshare.io/
[04:18:34] <Jymmm> http://codeshare.io/mMwnj
[04:19:51] <archivist> blank
[04:20:02] <Jymmm> the 2nd link?
[04:20:05] <archivist> yes
[04:20:26] <Jymmm> it might be slightly delayed
[04:20:36] <archivist> probably no clue about all the browsers out there
[04:21:56] <Jymmm> It does color syntax highlighting too.
[04:21:58] <Jymmm> oh try it now
[04:23:16] <archivist> http://www.collection.archivist.info/archive/grabs/Screenshot-5.png
[04:23:32] <archivist> what I call useless
[04:24:06] <Jymmm> That's not what I see here
[04:24:56] <Jymmm> bummer that is doesn't like ubuntu
[04:25:04] <archivist> someone please tell web designers the are other older systems out there that should be tested
[04:25:28] <archivist> Garmin needs a kick too
[04:25:33] <Jymmm> heh, understatement
[04:26:12] <archivist> their feedback fails so I could not even moan about it
[04:26:40] <Jymmm> browser + garmin?
[04:27:37] <archivist> I need to upgrade the map in my gps
[04:27:59] <Jymmm> which gps?
[04:28:00] <micges> Jymmm: codeshare.io works in opera on ubu 10.04
[04:28:07] <archivist> I did find the ugrade program is only windows and mac
[04:28:28] <Jymmm> micges: ah cool
[04:29:01] <archivist> model is i3
[04:32:17] <archivist> heh garmin site internal link goes to a 404
[04:33:41] <Jymmm> Well, this doens't help you http://www.gpsbabel.org/index.html
[04:34:01] <Jymmm> archivist: do you have a XP VM at least?
[04:34:24] <Jymmm> archivist: or maybe WINE ?
[04:34:43] <archivist> currently I dont have a running XP the laptop died
[04:35:03] <Jymmm> have the install CD?
[04:35:12] <archivist> not sure if wine can use the usb
[04:37:36] <archivist> probably have the CD "somewhere"
[04:37:49] <Jymmm> http://wiki.winehq.org/USB
[04:39:12] <Jymmm> archivist: I'd just create a base XP VM, save that somewhere safe, then make a copy to use as you need to. If you can slipstream it, it'll be much smaller.
[04:39:41] <Jymmm> If I find the time, that's what I plan on doing.
[04:40:27] <archivist> I dont have time to mess I just want it to work!
[04:40:48] <Jymmm> lol
[04:41:08] <archivist> it is about 10 years out of date probabpy
[04:41:44] <Jymmm> ah, not sure how old mine is 76cs, no longer has updated maps for it.
[04:41:58] <Jymmm> I believe
[04:42:05] <archivist> mine they stopped updating the software in 2007
[04:42:46] <Jymmm> ah
[04:43:00] <archivist> 2007 they releases 3.40 mine has an even older version of 2.5
[04:44:04] <archivist> it was cheap though on a fleamarket in its original box
[04:44:27] <Jymmm> I think mine has 3.x, the last pre-NT version
[04:44:38] <Jymmm> (NT is not a M$ thing)
[04:46:55] <archivist> I had fun last week doing a delivery to a "new build" estate so there was no possibility of the gps knowing where it was
[04:49:21] <SpeedEvil> archivist: coordinates
[04:49:51] <SpeedEvil> archivist: also, I've mapped new estates for openstreetmap before they opened
[04:50:29] <archivist> I want to be able to use openstreetmap on the garmin
[04:53:36] <archivist> hmm interesting page http://garmin.openstreetmap.nl/
[05:01:11] <archivist> so the big question, does that replace the file on the SD card or an addition
[05:06:07] <archivist> oops, the download is bigger than the card in the device :(
[05:12:53] <SpeedEvil> archivist: unsure
[05:13:10] <SpeedEvil> archivist: #osm (or is it #openstreetmap) over on irc.oftc.net
[05:13:22] <archivist> http://wiki.openstreetmap.org/wiki/Garmin.OpenStreetMap.nl:Manual
[05:14:17] <archivist> tells where to put it, but the 300MB plus .zip wont fit in 256mb methinks
[05:16:59] <SpeedEvil> I could lend you a 1G card if you can't find one :)
[05:18:02] <archivist> I had one somewhere, may look in tesco later
[07:21:01] <Lathe_newbie> is there a possibility to change the pid values in axis?
[07:33:21] <archivist> SpeedEvil, smallest was 4gb but reduced to clear!
[09:18:36] <Linuxcnc_user> Hallo zusammen ich bitte um entschuldigung wo bitte gehts hier zum deutschen channel? danke im voraus
[09:20:26] <Loetmichel> es gibt keinen deutschen meines wissesn
[09:21:22] <kfoltman> Germans in a CNC/engineering channel? UNPOSSIBLE!
[09:23:13] <Loetmichel> kfoltman: harhar
[09:24:00] <Linuxcnc_user> danke genau sowas hatte ich erwartet !
[09:24:10] <archivist> germans speaking german is a bit rare though
[09:24:19] <Linuxcnc_user> also danke dann und bleibt unter euch ihr wissenden
[09:24:42] <kfoltman> archivist: true
[09:25:25] <kfoltman> which is good because after 4 years of learning (20 years ago) I still can't understand much of it
[09:25:28] <Loetmichel> boah, that was a real strange guy
[09:26:29] <Loetmichel> had him in query. on the question what his problem is: "no, if they cant answer in german i will search elsewhere"
[09:26:37] <Loetmichel> and simply quitting
[09:26:42] <archivist> hehe
[09:27:44] <Loetmichel> maybe i could've helped him ( i doubt it) but actually he seemed determined to get NO help at all ;)
[09:30:26] <archivist> some expect too much for free
[09:31:11] <kfoltman> people are weird
[09:31:48] <archivist> I am not striving to be normal
[09:32:27] <kfoltman> people are weird even if they *do* strive to be normal
[09:42:51] <FrankZappa> I have problems with that pretty often. I encounter a lot of people who are respectful, then a few takers, then I start acting like everyone's a taker
[09:43:08] <FrankZappa> worst is now knowing
[09:48:08] <Lathe_newbie> shoul something like this work? http://abload.de/img/driver_new15cty.png
[09:57:37] <CaptHindsight> Lathe_newbie: sure, if properly designed :)
[10:02:14] <Lathe_newbie> CaptHindsight: the quastion is, is this design possible, as it is?
[10:03:07] <CaptHindsight> Lathe_newbie: why don't you just buy an H-bridge board for ~$25?
[10:03:23] <Lathe_newbie> CaptHindsight: its a fun project?
[10:03:41] <Lathe_newbie> ive build a h bridge with ir21844 drivers and this works
[10:03:48] <Lathe_newbie> now i wanna add a current chopper
[10:04:25] <CaptHindsight> sounds like a good conversation starter in #electronics
[10:05:00] <archivist> you had a chopper yesterday but shorted the sense to ground
[10:05:43] <Lathe_newbie> archivist: yesterday i just wanted to test my firmware
[10:05:54] <Lathe_newbie> the l298 has to low voltage vor my servos
[10:07:57] <CaptHindsight> http://www.ebay.com/itm/30A-Single-H-Bridge-Motor-Driver-Module-PID-for-Arduino-Smart-Car-E-/26149283259
[10:09:51] <CaptHindsight> http://www.ebay.com/itm/240W-High-power-H-bridge-Motor-Driver-module-Smart-car-Driver-Board-For-Arduino-/181419116379
[10:10:32] <CaptHindsight> http://www.ebay.com/itm/Semiconductor-BTS7960B-43A-Stepper-Motor-Driver-H-Bridge-Drive-PWM-For-Arduino-/301192456807
[10:11:53] <archivist> dunno what voltage he is looking for
[10:13:09] <CaptHindsight> http://www.ebay.com/itm/3v-36V-Dual-15A-H-Bridge-DC-Motor-Driver-30A-for-Robot-Car-Arduino-Compatible-/290934853872
[10:13:24] <CaptHindsight> some of these ^^ were up to 36-50V
[10:14:16] <CaptHindsight> 1,158 results for h bridge of fleabay
[10:16:46] <kfoltman> including the Shenzhen factor? ;)
[10:18:31] <CaptHindsight> laser specs tend to be over rated
[10:18:46] <CaptHindsight> but stepper driver specs tend to be under rated
[10:19:31] <CaptHindsight> if I can't see part numbers I treat it like gambling
[10:20:27] <kfoltman> I mean, if I see a Chinese hobby-grade driver advertised as "50V", I'm afraid of using it with 36V ;)
[10:21:29] <CaptHindsight> I've often seen the opposite as well, it might be max 90V but listed as 50V
[10:21:41] <kfoltman> nice :)
[10:21:59] <kfoltman> maybe some smaller parts (capacitors etc) were a limiting factor
[10:22:44] <CaptHindsight> I was looking for miniature steppers earlier. This is not, but listed as one http://www.ebay.com/itm/5pcs-DC-Motor-Micro-DC-Stepper-Motor-Motor-Miniature-D21mm-X-H25mm-Brand-New-/390861535836
[10:23:16] <kfoltman> looks like a regular DC brushed motor?
[10:23:58] <CaptHindsight> yeah, they tend to cut and paste similar words into their listings
[10:24:21] <CaptHindsight> it did leave out servo :)
[10:25:05] <kfoltman> oh well
[10:25:17] <kfoltman> "9 needle serial conversion"
[10:25:38] <CaptHindsight> heh pins and needles
[10:25:54] <kfoltman> :)
[10:26:32] <CaptHindsight> often the English textbooks used to teach English in China are wrong or use very odd expressions
[10:27:07] <SpeedEvil> Also, there is a general wierdness.
[10:27:26] <SpeedEvil> In foreign places, for obvious reasons, english is not taught in english.
[10:27:46] <SpeedEvil> It's taught to people who already speak a native tongue well.
[10:28:15] <SpeedEvil> So you get things like native expressions in that language being translated into english directly where they don't make sense, or are at best jarring.
[10:29:01] <SpeedEvil> This can perpetuate itself if there is significant native-produced 'english' content.
[10:29:18] <SpeedEvil> Indian-english is very noticably different from uk english say.
[10:30:26] <tjtr33> http://www.engrish.com/
[10:30:49] <CaptHindsight> all they need to do is have a native English speaker read their ad, but they often don't bother
[10:31:25] <kfoltman> SpeedEvil: well, most of Polish teachers of English used to speak with *terrible* accent
[10:31:27] <SpeedEvil> http://timesofindia.indiatimes.com/india/Press-Council-panel-criticizes-Bihar-govt-for-gagging-press/articleshow/18470573.cms - as an example
[10:31:49] <SpeedEvil> NEW DELHI: In a scathing indictment of the Bihar government, a Press Council report has leveled serious charges against the state establishment including attempts to censor the media, misuse its "monopolistic status" for giving advertisements and arm-twisting newspapers to publish positive stories.
[10:32:08] <SpeedEvil> 'arm-twisting' wouldn't be used quite that way in a UK newspaper
[10:32:22] <kfoltman> no?
[10:32:32] <kfoltman> I think I've seen that expression in some US media
[10:32:59] <kfoltman> but "for giving advertisements" does sound kinda odd to me
[10:33:22] <SpeedEvil> 'Taking advantage of its monopolistic status in handing out advertisements , the government is ostensibly found to be using this status as a lever to arm-twist the media houses with an eye to compel newspaper house managements to willy-nilly function as its undeclared mouthpiece," the panel said. '
[10:34:11] <kfoltman> sounds bit informal
[10:34:21] <kfoltman> or a weird mix of formal and informal
[10:34:31] <SpeedEvil> yeah
[10:34:38] <kfoltman> but at least it's relatively clear what they mean
[10:35:17] <kfoltman> using a lever to arm-twist, hmmm
[10:35:29] <kfoltman> that metaphor might have a little bit of impedance mismatch ;)
[10:35:47] <SpeedEvil> http://travel.cnn.com/mumbai/life/10-indianisms-652344
[10:38:14] <kfoltman> "Do one thing" - I think that is used in Polish as well.
[10:38:35] <kfoltman> with similar meaning as in Indian English
[10:40:53] <kfoltman> English is, generally, very very hard to speak correctly. It's full of nuances.
[10:41:26] <kfoltman> And evil phrasal verbs.
[10:41:57] <CaptHindsight> http://imagebin.ca/v/1Q1Ikg14ljPe government sign in Tokyo
[10:42:09] <SpeedEvil> kfoltman: yeah
[10:42:33] <archivist> but I just got off a train
[10:42:48] <CaptHindsight> polite but not exactly what they wanted to mean
[10:42:49] <kfoltman> http://blog.thisisnotrocketscience.nl/engrish-signs-in-shenzhen-1/ from our trip
[10:44:11] <CaptHindsight> a popular phrase I'd hear is "in my mind" for "I think"
[10:44:51] <t12> crypto-dualists
[10:44:55] <CaptHindsight> took us a while to realize they weren't schizophrenic
[10:54:59] <CaptHindsight> http://imagebin.ca/v/1Q1MnhSflkhQ Hong Kong drinking age
[10:59:33] <CaptHindsight> http://www.brendanmcgetrick.com/blog/wp-content/uploads/2007/07/tokyo03.jpg (outdoor smoking shelter) anyone seen these outside of Tokyo yet?
[11:01:13] <tjtr33> theres a box like that in Narita
[11:03:58] <CaptHindsight> nice airport, just don't get dropped off at the wrong terminal
[11:16:30] <Lathe_newbie> CaptHindsight: i need 120V 9A
[11:19:23] <tjtr33> yah those small drivers are 50V max, look at more industrial drivers, at least Gecko or better
[11:21:02] <Tom_itx> gecko is good for about 80 iirc
[11:22:40] <tjtr33> look at http://granitedevices.com/ www.copleycontrols.com/‎ www.a-m-c.com/ and whats on ebay
[11:25:44] <Lathe_newbie> tjtr33: cause of this i wanna build it myself
[11:26:50] <tjtr33> brushed dc? with tacho?
[11:39:57] <tjtr33> 144v 100a diy bdc driver http://www.instructables.com/id/Homemade-100-HP-Motor-Controller-for-an-Electric-C/ ymmv
[11:40:02] <tjtr33> bacl later
[11:54:34] <Lathe_newbie> tjtr33: brushed dc with encoder
[11:58:07] <archivist> Lathe_newbie, you need to design for a high stall current
[11:58:19] <Lathe_newbie> archivist: i know
[11:58:33] <Lathe_newbie> 105um Cooper
[11:58:42] <archivist> your devices are only 28A
[11:58:59] <Lathe_newbie> i dont use irf540
[11:59:37] <archivist> that is what is in your drawing you asked about! /me gives up
[11:59:51] <IchGuckLive> hi all B)
[12:00:17] <Lathe_newbie> archivist: the question was more about the current chopper
[12:01:07] <Lathe_newbie> will use irf3415
[12:01:09] <archivist> I disagree as it was "shoul something like this work? http://abload.de/img/driver_new15cty.png"
[12:01:42] <Lathe_newbie> archivist: yes i know... question was not very good
[12:02:42] <archivist> your messing with the L298 yesterday and question today makes me say buy a proper servo driver
[12:04:02] <Lathe_newbie> archivist: i have build a test board with ir21844 and irf540 cause they were here, and this is up an running
[12:05:09] <Lathe_newbie> now i wanna add a current chopper
[12:08:23] <kfoltman> how does high side switching work in that circuit?
[12:08:34] <kfoltman> charge pump to generate voltage > V+ + Vgs?
[12:11:32] <Lathe_newbie> yes
[12:11:52] <Lathe_newbie> ir21844 is a high side driver with charge pump
[12:11:57] <kfoltman> oh I see
[12:12:41] <IchGuckLive> archivist i did riun my mashines for over 5years on this l298 297 stages and still got one in the basement
[12:12:54] * kfoltman has a bunch of irf540 to play with, maybe it wouldn't be a bad idea to try something similar
[12:13:10] <IchGuckLive> cheep and good as 2USD now in the Asia market
[12:13:13] <Lathe_newbie> kfoltman: i dont use irf540
[12:13:20] <kfoltman> what do you use instead?
[12:13:25] <IchGuckLive> full asabmeld boards
[12:13:32] <Lathe_newbie> irf3415
[12:13:39] <Lathe_newbie> cause i have a lot of them
[12:13:49] <kfoltman> it's a bigger mosfet?
[12:14:43] <tjtr33> IchGuckLive, """lathe_newbie> ..: i need 120V 9A"""
[12:14:58] <Lathe_newbie> kfoltman: 140V 42A
[12:15:16] <Lathe_newbie> ähm 150V
[12:15:23] <Lathe_newbie> 0.042 RDS on
[12:15:41] <archivist> tjtr33, I get amused when he tries to sell to the wrong person too
[12:16:48] <IchGuckLive> steppers are only alowed to 82V as they internal require 5V
[12:17:03] <Lathe_newbie> IchGuckLive: i dont wanna use steppers
[12:17:48] <archivist> IchGuckLive, please be quiet when you dont know what the discussion is about
[12:18:22] <tjtr33> log at http://linuxcnc.mah.priv.at/irc/%23linuxcnc/2014-06-15.html
[12:21:36] <kfoltman> Lathe_newbie: are you making a servo?
[12:21:55] <archivist> he is
[12:22:54] <IchGuckLive> archivist why are ypou then talking on l297
[12:23:38] <archivist> IchGuckLive, he had an L"(* bridge yesterday NOT 297, you never look for full context
[12:23:40] <Lathe_newbie> kfoltman: yes
[12:23:52] <archivist> L298
[12:23:59] <archivist> still had shift on
[12:24:11] <tjtr33> recap: """lathe_newbie> ..: i need 120V 9A""" && """brushed dc with encoder"""
[12:24:39] <IchGuckLive> ok im off discussion
[12:24:46] <Lathe_newbie> IchGuckLive: i wanted to give a try for l298 yesterday... for testing the mesa firmware i have created... and did it with no schmemattic and had a few mistakes
[12:26:36] <kfoltman> speaking of motor driver ICs, anyone used L293E?
[12:27:03] <kfoltman> I bought it out of sheer curiosity, but, is it useful?
[12:27:27] <IchGuckLive> kfoltman: its max 500ma
[12:27:47] <Lathe_newbie> kfoltman: possible for small steppers
[12:28:02] <IchGuckLive> its the best for small scale motors
[12:28:19] <IchGuckLive> i use it in my CVNA68
[12:28:35] <Lathe_newbie> but for steppers i would use a3986 with additional gate drivers.... so u can use them for more than 50V
[12:28:38] <IchGuckLive> and also on scale worships on radar and ...
[12:28:44] <kfoltman> I think 2A peak?
[12:29:02] <kfoltman> but that would perhaps mean 0.5A per phase per half bridge
[12:29:09] <IchGuckLive> ut then you need more components as only the chip
[12:29:25] <Lathe_newbie> kfoltman: for steppers... take micro step drivers
[12:29:29] <IchGuckLive> i use plyin chip
[12:29:34] * kfoltman worships scales
[12:29:48] <Lathe_newbie> if 40V are enough take something from allegro
[12:29:59] <kfoltman> I fried too many allegro chips ;)
[12:30:17] * kfoltman would rather use something mostly idiot-proof
[12:30:30] <Lathe_newbie> kfoltman: if there is written 48V max take not more than 40^^ else u destroy them
[12:30:42] <Lathe_newbie> if u need more, take a3986 and add external gate drivers
[12:31:25] <Lathe_newbie> allegro chips are quite good... and if there are any problems... the distributors help...
[12:31:27] <kfoltman> Lathe_newbie: I burned them using 12V or so
[12:31:40] <Lathe_newbie> kfoltman: do you have a schematic?
[12:31:43] <kfoltman> Lathe_newbie: but my power and stepper connections were not reliable
[12:31:51] <Lathe_newbie> i just know the a3986
[12:31:52] <kfoltman> I used one of those pololu-like stepsticks
[12:32:31] <IchGuckLive> if you go ebay and search h-brige or l298 l297 you will find real cheep boards
[12:32:53] <kfoltman> IchGuckLive: I have several tb6560(?) boards with big heatsinks, they're unsinkable so far
[12:33:08] <kfoltman> the crappy green ones
[12:34:43] <kfoltman> they're probably not great when pushed to their limit, but I'm not doing that
[12:34:48] <Lathe_newbie> kfoltman: http://www.allegromicro.com/en/Products/Motor-Driver-And-Interface-ICs/Bipolar-Stepper-Motor-Drivers/A4989.aspx
[12:35:21] <Lathe_newbie> IchGuckLive: why just use half step if micro steps are possible?
[12:36:12] <IchGuckLive> steppers are most efficiant in half step mode
[12:36:37] <kfoltman> Lathe_newbie: the more steps you use, the less torque you have in some of the intermediate states
[12:36:53] <IchGuckLive> kfoltman: here is my carrier its 1:144 scale http://foengarage.de/cvn68.jpg
[12:36:53] <Lathe_newbie> but they run smoother
[12:37:16] <IchGuckLive> smooth is on clock freq most
[12:37:34] <kfoltman> Lathe_newbie: I'm planning to run mine with microstepping, but only stopping at half steps
[12:37:43] <Lathe_newbie> kfoltman: if u take the a4989 u can bypass the internal gate drivers and add external
[12:38:04] <Lathe_newbie> i was using them with about 100V
[12:38:33] <IchGuckLive> i always go for gear systems and 400steps so i got the best power
[12:38:41] <IchGuckLive> hi RagingComputer
[12:42:58] <IchGuckLive> example on myne plasma RAGs XY weight near 800lbs NEMA23 3Nm at 5i25/7i76 78V ,Rack pinion T10 Z12
[12:43:00] <kfoltman> Lathe_newbie: looks nice
[12:43:20] <IchGuckLive> so i got 120mm per rotation to solve down
[12:43:30] * kfoltman wonders why the hell he's using same steppers as IchGuckLive
[12:43:42] <IchGuckLive> as most uses also wood sp9ndle on thes mashines i go at 0.01
[12:44:13] <kfoltman> IchGuckLive: http://i.imgur.com/Jbb21hk.jpg
[12:44:13] <IchGuckLive> 120mm/0,01 =12000steps
[12:44:31] <kfoltman> IchGuckLive: my whole machine is probably a tiny fraction of 800lbs
[12:44:33] <IchGuckLive> 12000 /400 = I 30;1
[12:45:27] <IchGuckLive> kfoltman: lots of motor power to that tiny thing
[12:45:48] <IchGuckLive> is it 2005 ballscrews
[12:45:53] <kfoltman> 1605
[12:46:19] <IchGuckLive> so you use a 20/25 timingbelt to get the best pricision at staprate
[12:46:33] <kfoltman> 20/32 gearing
[12:46:43] <kfoltman> unfortunately :)
[12:46:47] <kfoltman> and only Y axis is geared
[12:46:51] <IchGuckLive> is this to match the inch mode
[12:46:55] <kfoltman> this wasn't planned well :)
[12:47:15] <IchGuckLive> cause 20/25 meets 400/0,01
[12:47:27] <kfoltman> that would be *too* nice ;)
[12:47:34] <IchGuckLive> i did a gear shematic html on that
[12:47:47] <IchGuckLive> http://foengarage.de/gears2.html
[12:47:50] <kfoltman> I can do the math, just didn't have a way to get the right gears cheaply :)
[12:48:16] <IchGuckLive> its a gear i know but the timingbelt is the same only same direction ov movement
[12:48:39] <Lathe_newbie> kfoltman: what looks nice?
[12:48:41] <IchGuckLive> kfoltman: rhere is always a way
[12:48:58] <kfoltman> Lathe_newbie: that allegro chip
[12:49:15] <kfoltman> Lathe_newbie: at least it's all external mosfets, so they're more likely to fail than the chip itself
[12:49:47] <Lathe_newbie> kfoltman: if u do an mistake on the mosfet side... the chip burns...
[12:49:51] <IchGuckLive> kfoltman: coudt you give me a replay if the gearsystem page works on your system
[12:50:00] <Lathe_newbie> i had a lot of them... when i build the 100V drive
[12:50:59] <kfoltman> IchGuckLive: it doesn't restart after the first cycle I think
[12:51:25] <IchGuckLive> kfoltman: on your mashine 48V is the best price goods arangement
[12:51:49] <kfoltman> IchGuckLive: I'm only using 18V or so
[12:51:52] <IchGuckLive> There is a 5sec delay to the button
[12:52:09] <IchGuckLive> oh bad stepper behavier below 24V
[12:52:28] <IchGuckLive> did you consider that
[12:52:32] <kfoltman> no :)
[12:52:45] <kfoltman> I can't run them at good speed with the current power arrangement anyway
[12:52:52] <IchGuckLive> there is a rule at 5times the netto Step voltige
[12:53:01] <IchGuckLive> for nema23 its 5.1V
[12:53:15] <kfoltman> the cheap drivers only go up to 24V or so
[12:53:15] <archivist> use the highest voltage possible to mitigate inductance effects
[12:54:13] <kfoltman> archivist: I'll get better power supply and maybe better drivers once the mechanical aspects are sorted
[12:54:54] <IchGuckLive> meanwell is your best fiend on that 60xx sized mashines
[12:55:40] <IchGuckLive> http://foengarage.de/mesa_elek.jpg
[12:57:32] <kfoltman> those high-power switching power supplies for LEDs?
[12:57:49] <kfoltman> I have one, but 12V only, useless
[12:58:22] <IchGuckLive> they got arealy nice one for us cnc freaks at 24/12/5
[12:58:38] <IchGuckLive> so you can go one for all
[12:59:16] <XXCoder1> hey ich
[12:59:32] <IchGuckLive> also a 24/5V for all those cheep boards
[12:59:55] <kfoltman> 24V 5V...
[12:59:59] <IchGuckLive> hi im off for today BYE ;-) so no more bad eng.
[13:00:22] <XXCoder1> later IchGuckLive
[13:04:21] <IchGuckLive> http://www.amazon.com/Power-Supply-Dual-Output-133-4/dp/B005T9JN6E/ref=sr_1_cc_1
[13:04:35] <IchGuckLive> AC to DC Power Supply Dual Output 5 Volt 24 Volt 10 Amp 5a 133.4 Watt
[13:04:58] <IchGuckLive> BYE
[14:37:08] <Jymmm> Chalk is cool... http://www.viralnova.com/microscopic-level/
[14:40:09] <XXCoder1> yeah
[14:43:01] <t12> spending time on EM puts the scale of an atom in useful terms
[14:43:17] <t12> like a 10 atom thick carbon film floating on water is something uou can see and manipulate by hand
[15:11:17] <Loetmichel> hrhr, steppers are good generators... the leds are now grilled... -> https://www.youtube.com/watch?v=i-p8sBqF6w4&feature=youtu.be ... i shouldn have moved the table so fast ;-)
[15:13:51] <DaViruz> when i was very young i discovered that a stepper made a great brake if you short all the leads
[15:14:29] <kfoltman> XXCoder1: how's your machine?
[15:14:46] <kfoltman> XXCoder1: http://i.imgur.com/bkIRNNl.jpg
[15:14:49] <XXCoder1> have nearly all parts, still nonexistant lol lemme show ya pic tho
[15:15:16] <Loetmichel> DaViruz: i have shot a friend over the handle of an ergometer (fixed bicycle with alternator as brake) once.
[15:15:30] <XXCoder1> kfoltman: https://scontent-a-sjc.xx.fbcdn.net/hphotos-xpf1/t1.0-9/s720x720/10355837_452434954901413_6426483331751996077_n.png
[15:15:45] <Loetmichel> he asked me to put on the load (500W halogen lamps). so i switched it hard on
[15:15:59] <XXCoder1> loet lol cool video
[15:15:59] <Loetmichel> -> instant standstill on the pedals ;-)
[15:16:06] <kfoltman> XXCoder1: moving gantry, ambitious (meaning: you're probably asking for trouble ;) )
[15:16:16] <XXCoder1> its pretty tiny
[15:16:17] <t12> need 2color led!
[15:16:36] <kfoltman> t12: indeed
[15:16:43] <kfoltman> the bipolar ones
[15:16:58] <t12> oh both phases!
[15:17:02] <t12> on
[15:17:02] <XXCoder1> interesting that steppers can be used as generators
[15:17:19] <kfoltman> XXCoder1: interesting? usually, a motor = an alternator
[15:17:21] <Loetmichel> XXCoder1: and not bad ones.
[15:17:40] <XXCoder1> would think only spidle and other types can be, but stepper wow
[15:18:03] <Loetmichel> i made a flashlioght of a small floppy stepper, 2 gears, a crank, a 22000µF cap and a bunch of leds with resistors in front.
[15:18:18] <XXCoder1> how effecient was it
[15:18:20] <Loetmichel> 20 secs cranking the thing made 3 minutes light
[15:19:48] <XXCoder1> not bad
[15:19:56] <kfoltman> awesome
[15:20:05] <XXCoder1> wonder what would happen if you added supercap 1 F
[15:24:09] <kfoltman> more cranking would give light for longer?
[15:25:03] <XXCoder1> kf those store bought crank light always have really shitty cap
[15:25:10] <XXCoder1> you would have top upgrade it
[15:34:20] <alex_joni> tjtr33: if you login then you get a link on the lower left side of linuxcnc.org
[15:34:41] <alex_joni> Jymmm: just like mine :)
[15:34:59] <alex_joni> looks like a clone of the one I got ..
[15:38:48] <XXCoder1> kfoltman: still unsure what to do with design lol
[15:39:01] <XXCoder1> but yeah moving bed would make for much stronger gantry
[15:39:12] <XXCoder1> as you can see in pic that cnc is tiny.
[15:39:23] <kfoltman> do not change design just because another newbie (me) told you to ;)
[15:39:44] <XXCoder1> others did say but I already planned to oplay around with fixed gantry cnc too
[15:42:33] <kfoltman> I think it's more important to start building it, because chances are that you didn't really think of some things
[15:43:02] <kfoltman> OTOH if you do a 3d model, it probably has a better chance of not having fatal flaws from start
[15:43:14] <XXCoder1> thats why I did it
[15:43:41] <kfoltman> I played a little bit with openscad and sketchup, but didn't really have patience
[15:44:35] <kfoltman> did some 2d cad drawings hoping to manufacture some parts in the laser cutting shop, but ended up doing most of the stuff myself
[15:44:41] <XXCoder1> I used freecad
[15:44:48] <kfoltman> + using ready made parts
[15:44:51] <XXCoder1> its not perfect but hella better than sketchup
[15:45:40] <kfoltman> I use draftsight, it's tolerable
[15:45:57] <kfoltman> but not free-as-in-speech
[15:46:12] <XXCoder1> ried freecad?
[15:46:17] <kfoltman> yes
[15:46:29] <XXCoder1> cool
[15:49:02] <Jymmm> alex_joni: You have cool chalk?
[15:54:22] <kfoltman> XXCoder1: I have it installed, it's just incomprehensible
[15:54:32] <XXCoder1> it takes bit to understand
[15:54:39] <XXCoder1> if you experenced inkscape it helps
[15:54:46] <XXCoder1> theres "modes of function"
[15:55:29] <kfoltman> for example, I'm moving a second point, and this causes the first point to switch to a completely random place
[15:57:54] <XXCoder1> lol https://i.chzbgr.com/maxW500/6025678592/h4A2D83D2/
[15:57:57] <XXCoder1> creative repair
[15:58:05] <XXCoder1> hard to find
[15:58:12] <XXCoder1> kf what was you trying to do?
[15:59:24] <alex_joni> Jymmm: ?
[15:59:52] <Jymmm> alex_joni: 2014-06-15.13:16:40 alex_joni: Jymmm: just like mine :)
[16:00:02] <alex_joni> 15:44 #linuxcnc: < Jymmm> alex_joni: My new mini cnc lathe...
[16:00:04] <alex_joni> http://www.amazon.com/Sanven-Metal-Motorized-Machine-Quality/dp/B00H2BV5MM/ref=sr_1_12?s=hi&ie=UTF8&qid=1400934433&sr=1-12
[16:00:30] <XXCoder1> lol nice https://i.chzbgr.com/maxW500/7327293952/h1C91DBD7/
[16:00:32] <Jymmm> alex_joni: Oh, heh, I posted that a LONG time ago =)
[16:00:52] <alex_joni> I got it now ;)
[16:01:04] <Jymmm> you bought that one?
[16:01:29] <alex_joni> a similar one.. from the cool tool
[16:01:35] <Jymmm> lol
[16:01:54] <alex_joni> they suppu linuxcnc controls with theirs
[16:02:12] <alex_joni> http://www.thecooltool.com/produktgruppe.php?language=d&pg_id=7
[16:02:16] <alex_joni> supply
[16:03:26] <alex_joni> I have this one: http://www.thecooltool.com/galls/metallinecnc/bsp24.jpg
[16:03:54] <alex_joni> sorry.. this: http://www.thecooltool.com/galls/metallinecnc/bsp23.jpg
[16:04:21] <alex_joni> well.. off to bed for me (got 4h sleep last night.. early flight)
[16:04:27] <alex_joni> night all
[16:05:08] <Jymmm> where ya goin?
[16:12:19] <Loetmichel> soo, done for today. work for tomorrow evening: cabling, electronics, endswichtes, adjusting. http://www.cyrom.org/palbum/main.php?g2_itemId=14969
[16:15:50] <kfoltman> XXCoder1: I'm learning to draw parts using constraint-based approach, it's weird
[16:16:02] <XXCoder1> yeah it is
[16:16:05] <kfoltman> logical, but weird
[16:16:51] <kfoltman> at least I can parameterize the design easily
[16:17:05] <kfoltman> change one constraint and things (mostly) fit in place by themselves
[16:17:13] <XXCoder1> thats awesome aspect
[16:19:01] <kfoltman> OTOH it goes haywire easily
[16:20:58] <SpeedEvil> 'Ok - now where do I find a blank -18 light years long.
[16:24:54] <jdh> ebay
[16:30:34] <SpeedEvil> https://www.kickstarter.com/projects/alturn-usa/new-design-pancake-mulitrotor-bldc-for-mulit-copte?ref=categor
[16:38:58] <Nick001-shop> G76 - anyone around who knows this one?
[16:41:13] <Nick001-shop> I want X to pull straight out at end of Z travel - end of thread - What code and value?
[16:45:42] <SpeedEvil> The above in principle looks very interesting for CNC.
[16:45:53] <SpeedEvil> It's a coreless design of brushless motor.
[16:54:41] <Deejay> gn8
[17:21:50] <XXCoder1> HMM
[17:21:57] <XXCoder1> modified my cnc design
[17:22:00] <XXCoder1> uses bit less wood
[17:22:16] <jdh> less wood is almost alwayhs good with boats and cnc
[17:22:27] <XXCoder1> AND it gives me bit more gantry room
[17:23:03] <XXCoder1> 131 mm height from surifical layer to bottom of gantry
[17:23:14] <XXCoder1> 5 inches
[17:24:43] <SpeedEvil> http://www.maxwellwoodsb.com/TheProcess.html - if making your CNC from wood
[17:25:27] <SpeedEvil> (plywood is already thermally treated largely - so it has the same benefits)
[17:27:00] <FrankZappa> YES
[17:27:02] <FrankZappa> FUCK YES
[17:27:13] <FrankZappa> THIS IS AWESOME THANK YOU SPEEDEVIL EVERYONE CLICK THE LINK THANK YOU
[17:27:32] <FrankZappa> I'd rather replace my deck with this every decade than use treated lumber
[17:28:18] <FrankZappa> better than Trex composite fiber pulp junk
[17:28:28] <XXCoder1> SpeedEvil: nice but I will use free wood
[17:28:38] <XXCoder1> I have unlimited free wood source
[17:28:51] <SpeedEvil> nothing stopping you treating it
[17:29:05] <XXCoder1> how od I treat it
[17:29:22] <SpeedEvil> See the above
[17:31:14] <XXCoder1> thats pretty nice
[17:31:20] <XXCoder1> dont have anything to do that though
[17:32:25] <SpeedEvil> some sheetmetal to enclose a kiln - thick foil would work - some fibreglass insulation, a heater, and a fan and you're pretty much done
[17:34:30] <XXCoder1> cool
[17:39:27] <SpeedEvil> heater = kettle + a length of pipe heated to the desired temp with the steam flowing through it to superheat
[17:43:50] <XXCoder1> SpeedEvil: https://dl.dropboxusercontent.com/u/53432577/cncidea8.png
[17:43:54] <XXCoder1> kfoltman:
[17:44:53] <SpeedEvil> That's a hell of a lever arm on the bottom axis
[17:45:21] <XXCoder1> you gonna explain a bit more
[17:46:42] <SpeedEvil> There is about 7 or 8 times the distance between the bottom axis ones.
[17:46:48] <SpeedEvil> and the cutter head
[17:47:45] <SpeedEvil> A kilo of side-force will translate into several kilos of up/down force on the bottom axis fixings
[17:48:40] <XXCoder1> distance between blocks for X axis (I'm calling it X axis for now) is 150 mm
[17:48:50] <XXCoder1> height of gantry is 443 mm or so
[17:49:16] <kfoltman> yes?
[17:49:27] <XXCoder1> updated design if curious
[17:49:32] <SpeedEvil> that's not as bad as it looked
[17:49:47] <XXCoder1> yeah scale looks larger but really its tiny cnc
[17:49:54] <kfoltman> XXCoder1: I'm going to bed in 30 seconds ;)
[17:50:01] <XXCoder1> lol ok night man
[17:50:07] <SpeedEvil> I mean - it looked more like 8:1 than 3:!
[17:50:10] <SpeedEvil> night kfoltman.
[17:50:25] <XXCoder1> lol yea
[17:50:28] <XXCoder1> so it works I guess
[17:52:07] <XXCoder1> oh I see an issue with this design
[17:52:17] <XXCoder1> X axis motor gonna need place to be put in
[17:52:53] <XXCoder1> probably have to core out part of that front end 4x4 end wood block
[23:17:27] <XXCoder1> http://www.3ders.org/pricecompare/3dprinters/
[23:17:29] <XXCoder1> weird
[23:17:36] <XXCoder1> cheapest one is just $200
[23:53:42] <fenugrec> does the choice of ext2, ext3 or ext4 formattin make any difference on latency results ?