arm-netbook July 2017

arm-netbook@lists.phcomp.co.uk

35 participants
21 discussions

screwed up the Riki200 plotter design
by Luke Kenneth Casson Leighton 29 Jul '17

29 Jul '17

http://forums.reprap.org/read.php?177,767087,779977#msg-779977 ok so i screwed up. i didn't do a full force-analysis of the plotter design concept, and it was only when i tried turning each of the motors that i realised that with a double pulley system the force on one is double that of the other. with the two pulleys being separated by 320mm that means that just turning the motor *will* cause the X/Y-ends to "shear". this is... bad :) fortunately someone posted a few days ago that they have a concept which they've named "Edge-XY" - similar to CoreXY except the single X-Gantry (the horizontal bar of an "H") is replaced with *dual* X/Y (cross) rods. now, what's particularly fascinating about Edge-XY is that an important and previously under-appreciated design flaw of CoreXY is completely sorted! also very fortunately, the EdgeXY concept is very very similar to what i was trying for the Riki200 plotter concept... so i can convert over to EdgeXY with very little extra work. about 16 hours of re-printing parts but about... a week's worth of CAD design effort. which isn't too bad for correcting a major design cock-up :) i will try to work in the double-pulley system into the redesign: due to the fact that the belts are fixed onto the moving X/Y-ends of the EdgeXY it would be a 3x force multiplier not a 4x one, but also the forces (the pulleys) would be *on the same blocks* (separated by about 20mm) and would be force-balanced. made that mistake once already.... not doing it again :) l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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CNC milling of plastic lumber instead of 3D printing?
by Ricardo Wurmus 28 Jul '17

28 Jul '17

Heya, this idea is too late for the current batches of laptops, but I was wondering if it wouldn’t be easier and faster to mill the laptop plastic parts out of recycled blocks of plastic (“plastic lumber”) with a CNC mill. The advantages are as follows: * suitable plastic lumber can be made from a wider range of plastics than 3d printer filament * plastic lumber can be made from readily available plastic waste. HDPE from plastic bags make for cheap sturdy blocks of material. * a CNC mill cares much less about the melting point of the work piece during operation than a 3d printer * there are fewer concerns about material shrinkage at construction time, because the work piece isn’t partially liquid at any time of the CNC operations. * processing the work piece is faster because it doesn’t require as much motion as printing sturdy zig zag patterns. * even rather unsophisticated CNC mills can be used as the work piece is rather soft compared to the usual CNC mill work pieces such as aluminium. The most obvious disadvantages are: * there seem to be much fewer vendors of plastic lumber than there are vendors of high quality 3d printer filament * this approach isn’t quite as common, so it may be harder to find good advice from experienced people. What do you think? (I’m currently in the process of setting up a plastic recycling work space for my plastic lumber needs.) -- Ricardo GPG: BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC https://elephly.net

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Cell phone question
by Joseph Lira 24 Jul '17

24 Jul '17

Hello So I read in one of your updates about the raspberry zero phone, it sound really cool and for some time i wanted to get a smartphone but i see that they all have sort shelf lives meaning you buy the lastest samsung and it will get maybe updates for 2 years which at that point its viewed as obsolete, not to mention all the lock downs from the vendor/manufacture. I have looked at copperhead os but they still have the issue with shelf life 3 years tops, so im wondering what phone do you guys use? I just want a phone that let me listen to my music, use the gps without any ties, control the camera, some apps, that i can keep updating and patching until its truelly obsolete and all will still respecting my privacy, does such a phone exist?

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Re: [Arm-netbook] Cell phone question
by ronwirring＠Safe-mail.net 23 Jul '17

23 Jul '17

-------- Original Message -------- From: Joseph Lira <saitdude(a)hotmail.com> Apparently from: arm-netbook-bounces(a)lists.phcomp.co.uk To: "arm-netbook(a)list.phcomp.co.uk" <arm-netbook(a)list.phcomp.co.uk> Subject: [Arm-netbook] Cell phone question Date: Sun, 23 Jul 2017 18:03:37 +0000 > Hello > >does such a phone exist? I think a common phone will get lineageos compatible. By default lineageos comes with no google applications. If lineageos apart from that gives you enough privacy and security, I also would want to know?

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Re: [Arm-netbook] early access EOMA68 to hardware for parabola ARM maintainers?
by Vincent 21 Jul '17

21 Jul '17

Yes, unfortunately I did press "reply" without noticing I was sending it to you directly instead of the list. However, I did send another email to the list as reply just a few seconds later. Yes, I'm interested in the a20 pre-production boards. You can add me with the following details: Vincent, Germany, my-email-address On 07/20/2017 07:42 PM, Luke Kenneth Casson Leighton wrote: > --- > crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68 > > > On Thu, Jul 20, 2017 at 6:14 PM, Vincent <ml.eoma68(a)eml.cc> wrote: >> Hi everybody, > > you sent this to me only! > >> Please also add me to the early access list. >> >> Since the project is experiencing some delays and I would like to move >> on with my i.MX7 design, it would be really helpful to have an early >> version as reference. > > ... of the a20? edit this and add some contact details / identifying > info that i will be able to reach you by > http://rhombus-tech.net/allwinner_a10/ > > >> Thank you very much. >> >> Best regards, >> Vincent >> >> On 06/21/2017 08:46 PM, Luke Kenneth Casson Leighton wrote: >>> --- >>> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68 >>> >>> >>> On Wed, Jun 21, 2017 at 7:23 PM, Andreas Grapentin >>> <andreas(a)grapentin.org> wrote: >>>> >>>> Hi Luke, >>>> >>>> On Tue, Jun 20, 2017 at 11:20:25AM +0100, Luke Kenneth Casson Leighton wrote: >>>>> when endeavouring to do an update there were two key conflicts, >>>>> related to udev, systemd and mesa-gl attempting to be upgraded. the >>>>> upgrade could therefore not proceed. >>>> >>>> could you give us access to the image you used? that would make it >>>> easier to find the issues. >>> >>> can do. one ironic thing: i cannot remember how i got eudev >>> installed! i.e. from which repo. >>> >>> 1.7gb upload... *shudder*. ok. i have space. it's going to take... >>> 10 hours @ 40k/sec. will get back to you in a a few days as i do not >>> expect it to complete first time (rsync is my best friend here). >>> >>>> However, due to some changes in arch, there is currently no clean >>>> upgrade path from 2016 images that does not require manual intervention. >>>> See here: >>>> https://www.archlinux.org/news/ca-certificates-utils-20170307-1-upgrade-req… >>> >>> yuck. >>> >>> ok. >>> >>> _______________________________________________ >>> arm-netbook mailing list arm-netbook(a)lists.phcomp.co.uk >>> http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook >>> Send large attachments to arm-netbook(a)files.phcomp.co.uk >>>

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Existential 3D Printing Moments
by Neil Jansen 21 Jul '17

21 Jul '17

Hi, I'm reaching out to Luke Kenneth Casson Leighton. I recently read your latest update post on the Crowd Supply campaign for the EOMA68, titled: "Existential 3D Printing Moments". You mentioned that you needed help and/or advice on 3d printing for manufacturing. I have a lot of very specific experience here. I ran an open source project that required us to set up a 3D printer farm for manufacturing our first run of machines. I've lived in China while trying to get our project ready for mass manufacture. I have some advice for you, if you're willing to listen. I'd prefer to chat via video or audio, as there's so much to cover, I'd get carpal tunnel typing it all out. I'd be OK with summarizing the meeting minutes here afterwards, as to not exclude anyone else. I can meet pretty much any time regardless of time zone. Let me know either way. I've been following this project for quite a while (since the Slashdot AMA years ago), and I really want you guys to succeed. I missed the crowd funding round, but would still buy a few after they're fulfilled. Send me a direct email if you're interested in chatting. njansen1 at gmail dot com

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rhombus-tech.net 'Server not found'
by Richard Wilbur 19 Jul '17

19 Jul '17

Anybody else see rhombus-tech.net right now? I'm thankful I saved the images of the PCB I'm reviewing to the local computer. -- Richard

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Do you think when the new LTS kernel comes out,
by zap 15 Jul '17

15 Jul '17

that it will support a20 in the near future? whether linux libre or not? I was curious because you said the processor a20 doesn't support linux 4.9 am I right? In september, I plan to order one. This will determine how much I want it. I use devuan ascii currently so... yeah. I don't really know when you will make the 2nd revision or whatever you call it of eoma68/? ? meaning the processor you choose which I believe you said was the rk3388 right?

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Technoethical - a good-looking seller of HW with Libre SW & firmware (Technoethical holds RYF certification)
by dumblob 12 Jul '17

12 Jul '17

Hi, I just came across Technoethical (https://tehnoetic.com/ ) and was surprised by the range of libre products they sell. Technoethical is also RYF (https://ryf.fsf.org/ ) certified. Luke, it might be worth contacting them with EOMA notebooks. Cheers, -- Jan

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OT: What is maker geeks filament like
by David Niklas 08 Jul '17

08 Jul '17

Luke, You have mentioned the need for better quality PLA and I just noticed this deal: http://www.makergeeks.com/mafigrbag2kg.html Not that I'm about to buy, but do you know anything about this company? Thanks, David

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arm-netbook July 2017