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Cake day: June 23rd, 2023

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  • So where do you put the rest of your helices on a cylinder or cone, in 2D? In Flatland a screw or bolt becomes a circle with a short hair. The whole point of “leftie loosy” is to try to help with reality as we perceive it.

    Try it the next time you are underneath a car wielding a socket spanner with a taped on extension thingie that you jury rigged whilst trying to shift a hex nut at 45 degrees to reality that you cannot see, with oil dripping in your eye. Obviously the oil is a mix of the 30 year old native stuff loosened up with the WD40 that might break the rust lock.

    I suggest you do think abut things in 3D and don’t forget the other dimension (time). That WD40 needs time to break the rust lock.

    “Leftie loosy” isn’t for keyboard worriers - its for engineers and technicians, plumbers, and the rest and obviously for DiYers.

    When you are knackered and pissed off and you need to shift a fucking nut or bolt or whatever, you need incantations to get you back on track.


  • Apple: User - you are holding it wrong!

    The spanner is always at 12 o’clock. Either turn yourself or the spanner or your point of view to make it so and then the rule holds. The last option require imagination.

    Take the piss after you have tried to thread a nut on a bolt that you cannot see and tightening it is towards you, at an angle. The nut has to cross a hack sawed thread and will try to cross thread 75% of the time unless the moon is in Venus.




  • They are not a circle unless you have some really odd bolts or screws! I suppose a bolt looks like a circle in “Flatland” but we live in 3D space with time as a fourth dimension that we can directly perceive.

    A screw or bolt and the rest are, roughly speaking, a cylinder with a helical thread on it. They also have a “head” or similar which acts a stopper. You can model all of them as a bolt. We use a spanner, wrench, fingers, screw drivers, drill drivers, scissors, whatever to do the tightening or loosening. You can model all those tools as a spanner (wrench). We need some final mental contortions to make this slightly rigorous: The spanner (wrench) is always considered as being at 12:00 on an imaginary clock and we have to assume that our bolt moves away from us for “tighten” and towards us for “loosen” and I suppose we should also require that we are looking at the “face” of the notional clock and not its obverse!

    Now it should be obvious how the rule works. Turn the spanner to the right and you tighten the bolt, turn it to the left and you loosen it.

    OK that lot is not very helpful when you are under a sink or in a roofing void performing strange contortions. Try holding up one of your hands and pretend you are holding a bolt or the head of a screw. Clockwise turns will tighten and anti clockwise will loosen. You might use “leftie loosey …” to bootstrap: “clockwise tighten”. It becomes even more interesting when you are trying to work out which way to turn a bolt or whatever when you can only feel it and when tightening actually moves it towards you.

    Think about a bolt running through a wheel with the head towards us, say on a very simplified bicycle. Move the bike to the right, and hence the wheels turn clockwise. Friction should cause the bolt to tighten. If you change the design and put the bolt in on the other side and now forwards for the bike is to the left then you will loosen the bolt and that will be dangerous. Now change the design to a bolt with a nut and washers etc and it rapidly gets complicated!

    Also, please note that some bolts have reverse threads to the norm. On a garden strimmer the tightening knob that holds the spool on is often a reverse threaded bolt. That’s for similar reasons to the bicycle wheel thing I mentioned earlier.

    I’ve just spent ages and a lot of words to try and persuade you that this has bugger all to do with autism. I think that your error was really to do with not thinking too deeply about the real issue and focusing on the wrong thing. We all do that, extremely often, regardless of where we are on the spectrum.

    I hope that you see that considerations with regarding helical threads on a cylinder or a tapering cone (but not circles) can be quite complicated and that’s why sometimes we all need some silly rules to get us through the every day ordeal of dealing with them.

    Now, would you like a chat about circles … 8)



  • What are they?

    I ditched Windows roughly 15 years ago and I run a MS Silver partner shop.

    I daily drive Kubuntu (was Arch but I need to tick boxes). I used to teach DTP, WP, spreadsheets etc and Libre Office is fine as a replacement for MSO. Email - Exchange and Evolution EWS. I create the most complicated docs in my firm and MSO works with them OK.

    I 3D print stuff and use LibreCAD and OpenSCAD. All good. Also note that there are lots of other CAD apps on Linux for free/libre and of course we have

    As far as I am aware, games is the only area that Linux might fail and that issue is shrinking rapidly.


  • I doubt it. They make a hell of a noise and print at a rate of characters per second not pages per second. The ribbons suffered from similar issues as cassette tapes (the other ribbons that we had to deal with). The ribbon would dry out if not used for a few days and you’d waste paper and a lot of time.

    DM printers were ideal in the guise of “line printers” - the big old IBM jobbies that munched through A3 landscape fan fold at ridiculous speeds. Home printers like the Epson FX80 or RX80 were at least affordable. I still remember the manual of our RX80 congratulating us on buying it and exhorting me to hug the printer on unpacking it. I suspect the Japanese to English translation might not have been the best.

    We had to get a Centronics interface board stuffed into our C64 and get it working (sacrifice a chicken on a waxing gibbous moon night, etc)

    It worked better on my 80286 box, some years later. I had to set it up in each application - Harvard Graphics, Word Perfect, Super Calc.

    In around 1991 I was able to buy a 80486 based beastie, thanks to gift from granddad. In around 1993 I was given a HP LJ 4P so I could print out proofs for a Plymouth (Devon) tourist tat thing.

    Nowadays I have a fairly elderly HPE MFP five toner humming away at home. Its on a VLAN that doesn’t get to see the internet. It just works. I won’t be “upgrading” it for the foreseeable future.


  • My Epson RX80’s ribbon is somewhere in landfill. The Commodore 64 however is all good and now sports a USB interface with more storage than the poor thing can possibly ever use. The Quickshot II joystick still works too.

    1984ish was when the C64 was bought by my dad, from the NAAFI in Rheindahlen (West Germany, as was).

    Picture the scene:

    Me and brother fly home from UK to probably Dusseldorf at the end of the winter term. Its December in the mid '80s. Every now and then, Russia sends a Tupolev Bear or Badger to chug along overhead. The US sends a YR-71 over the USSR at multiples of the speed of sound. The Cold War was quite unpleasant to live through. Its quite chilly, snow tyres on the car, chains in the boot. The autobahn has the usual psychotic bunch of lane two and three drivers. Lane one generally runs at around 90mph (yes, even back in the '80s)

    We get to home at the time (we move every two years or so - it is the way of things). Dad shows off the new gadget. He plugs the power lead into the video port.

    Some weeks after we have gone back to school for the spring term, the C64 is returned from the menders. We get to use it in the Easter hols. It travelled to the UK and back to DE several times and also to Cyprus (WSBA). The QS II took a serious battering thanks to Daley Thompson’s decathalon.

    I got it re-capped in 2019, which was all that needed doing. They were rather well made …




  • gerdesj@lemmy.mltoMemes@lemmy.mlBeware of security risks!
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    27 days ago

    I’m not feeling too genocidal at the moment and I’m not too sure what a big blob of capitalism looks like but it sounds like you are impugning me (int al) in some way.

    If you are going to deliver a stinging attack on something you dislike, why not deploy an impassioned and pithy argument rather than … that. You do at least manage to spell it’s correctly, which is nice.