Clive Brown 1 | 30/10/2017 08:33:34 |
1050 forum posts 56 photos | "Archimedes screws are left hand threads normally."
I was with my grand-son in an adventure play-ground last week. There were two hand-operated archimedian screws lifting water from a stream several metres to the sand-pit. Both were right-handed, ie clockwise rotation at the top to lift water. All the children that I saw seemed to turn them the correct way without much thought about it.
Edited By Clive Brown 1 on 30/10/2017 08:34:41 |
martin perman | 30/10/2017 08:57:20 |
![]() 2095 forum posts 75 photos | Posted by not done it yet on 30/10/2017 08:07:56:
Even down to about a hundred years sgo, those that were left handed were cajoled into using things right handed. Most machines, by then were only easily operated that way. I doubt if left handed scissors were made that long ago, for instance! (anyone know for sure?). I put handedness down to mothers feeding babies (after breast feeding). Sat on knee, fed with right hand and baby will try to hold the spoon with the right hand. Possibly goes back to stronger heart beat on the left side (ventricle v atrium) and the way babies were carried. According to my mother I was left handed from day one, my parents made no attempt to try and make me use my right hand but the school did, unsuccessfully, but certain school equipment, desk calculators etc were difficult to use but it made me adapt and now I use both hands just as well with one exception, if you put a knife in my right hand I become incapable of any control.
Martin P
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Ian S C | 30/10/2017 09:08:55 |
![]() 7468 forum posts 230 photos | Handedness is controlled by the brain, a RH person uses the LH brain to control the RH side if the body and a LH person uses the RH brain. About 10% are left handed, but not all people who appear LH are, some of you will have heard of the Kiwi left hand golfer Bob Charles, He's RH, but when he was a kid the only golf clubs around belonged to another member of the family(aunt, mother, can't remember) who was LH. Ian S C |
vintagengineer | 30/10/2017 09:35:18 |
![]() 469 forum posts 6 photos | To draw the water up they have a left hand thread so when turned clockwise the water is drawn up. Posted by Clive Brown 1 on 30/10/2017 08:33:34:
"Archimedes screws are left hand threads normally."
I was with my grand-son in an adventure play-ground last week. There were two hand-operated archimedian screws lifting water from a stream several metres to the sand-pit. Both were right-handed, ie clockwise rotation at the top to lift water. All the children that I saw seemed to turn them the correct way without much thought about it.
Edited By Clive Brown 1 on 30/10/2017 08:34:41
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ega | 30/10/2017 09:56:27 |
2805 forum posts 219 photos | I started a thread over on the Tormek wet grinder website about their "EzyLock" nut. This is a 12mm x 2mm pitch circular milled-edge lefthand nut which retains the stone on its shaft. In use, the nut is just lightly spun on counter clockwise with the fingers and the clockwise rotation of the stone then causes it to tighten sufficiently. It seems that users had difficulty in removing the nut even with tools and despite the fact that they were attempting to turn it in the correct, clockwise direction whilst, I believe, holding the stone still. Tormek's prescribed procedure, however, is to immobilise the shaft by grasping the honing wheel on the other end and rotating the stone clockwise which causes the nut to undo. This procedure is unintuitive at first sight but apparently works every time and I think depends on the coarseness of the thread and the leverage of the 250mm diameter stone. For anyone interested, here is the link: Incidentally, the Tormek is aimed in part at woodturners, many of whom are ambidextrous. |
not done it yet | 30/10/2017 10:45:51 |
7517 forum posts 20 photos | but not all people who appear LH are, Very true. I shoot from the left shoulder as my left eye is master. Done it ever since being knee high to a grasshopper. Aiming the cork guns at the local fair was when I started it, as I could not comfortably close my left eye while keeping the other open, whereas the other way was easy. I still used to operate the bolt on my rifle (Browning T bolt) with my right hand. I bought it because it was a sliding (rather than lifting and sliding) bolt action. Also, a mate at school was right handed for everything except batting at cricket. His dad was left handed and taught him that way. He bowled right handed, of course.
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I.M. OUTAHERE | 30/10/2017 12:46:35 |
1468 forum posts 3 photos | I'm all over the shop ! Throw a ball and write left handed and everything else right handed but when it comes to welding i stick weld left handed but tig and mig right handed ! I used to drive my welding teachers mad as i used to switch hands all the time ! It has been a handy thing though as i can weld equally as well either hand in any position . I would say i'm right handed but was taught to write and throw a ball by my left handed sister . I could never master shooting opposite hand though - it just felt wrong ! Ian .
Edited By XD 351 on 30/10/2017 12:48:07 |
vintagengineer | 30/10/2017 13:25:01 |
![]() 469 forum posts 6 photos | I used to be able weld and write with either hand until some bugger run me over with his car!
Posted by XD 351 on 30/10/2017 12:46:35:
I'm all over the shop ! Throw a ball and write left handed and everything else right handed but when it comes to welding i stick weld left handed but tig and mig right handed ! I used to drive my welding teachers mad as i used to switch hands all the time ! It has been a handy thing though as i can weld equally as well either hand in any position . I would say i'm right handed but was taught to write and throw a ball by my left handed sister . I could never master shooting opposite hand though - it just felt wrong ! Ian .
Edited By XD 351 on 30/10/2017 12:48:07
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Mike | 30/10/2017 15:56:30 |
![]() 713 forum posts 6 photos | I never could write left-handed, but I was ambidextrous with most tools - and thank goodness for that, because five years ago a stroke took away most of the strength in my right hand. When you think about it, most of the important controls on a lathe have to be used with the left hand. Like Ian, I never could use a long gun left-handed, but I could shoot a pistol with either hand. My dad was at one time a keen cricketer, and he used to bat left-handed and bowl right-handed - he always said because he was taught to bat by a left-handed coach. A medical professional who treated me for right-side tennis elbow told me to fish left-handed until I recovered, and it was not as difficult as I had anticipated. |
JohnF | 30/10/2017 20:53:55 |
![]() 1243 forum posts 202 photos | Going back to the original post its probably like who invented the wheel and we will never know the answer ! However you all must realise we lefties were picked out special -- to be different to the crowd !!!!! Me well I write left handed, shoot right handed, etc etc the fact is we just do what comes naturally and as far as tools are concerned it never causes me a problem that most are designed for RH people. |
Mike Poole | 30/10/2017 21:47:35 |
![]() 3676 forum posts 82 photos | A chap in a Beatles tribute band who went into great detail to look the part as well as sound right had to learn to play bass left handed, you can't have a right handed Paul McCartney. Mike |
David Taylor | 31/10/2017 03:47:18 |
![]() 144 forum posts 39 photos | Posted by Mick B1 on 29/10/2017 22:29:04:
They were following the sun, which appears to rotate clockwise through the sky. Hence anticlockwise or left hand threads are 'widdershins' - against the sun. That threw me for a second... I'm in the southern hemisphere! |
JOHN MANTOVA | 31/10/2017 06:19:51 |
7 forum posts | Witches covens dance "Widdershins" I believe Hehee |
not done it yet | 31/10/2017 09:29:47 |
7517 forum posts 20 photos | Yes, but the word 'clockwise' was conjured up, to describe the direction only relatively recently - the Sun had been doing that (apparently) since the solar system developed. We now know that, as Mick was careful to write, 'appears' is a way of saying the Sun does not actually move in relation to the Earth - without further confusing the poor souls who still apparently believe the Earth is the centre of the Universe. A bit like the statement that 'the Sun has come out from behind that cloud'! Not a shred of truth, but continues the fallacy to future generations. |
larry Phelan | 31/10/2017 09:43:32 |
![]() 544 forum posts 17 photos | Even as late as 40 years ago kids here were regarded as something weird if they were lefthanded,and beaten in school for being so. How do I know ?,been there,done that,still doing it ! Still use hammer and hacksaw,screwdriver ect left hand,no problem. But I,m still WEIRD !!! |
larry Phelan | 31/10/2017 11:28:59 |
![]() 544 forum posts 17 photos | Just thinking a little more about this,I remember when other guys came to use some of my equipment in my workshop,they were never quite at ease with the layout.Everything seemed to be in the wrong place [which it was,for them ] Without thinking about it,I had set it up to suit myself,so everything was ideal for lefthanded use. Still is. They could never understand how I could use my Skill saw with my left hand,since all these machines are made for right hand use.Still,although I use all hand tools left handed,I have no problem using drilling machines,chopsaws,ect Rt handed Before I was "corrected" I used to write with my left hand,quite clear writing too,but this was considered to be the mark of the EvilOne,so it was beaten out of me and I was forced to write Rt handed with the result that my writing is so bad that I can just about read it myself,if I,m lucky. I,m told they have a more enlightened view these days,too late for me since I have sheets of notes I took years ago which might as well be in" Chinese of the day" for all the use they are to me. So I say "LONG LIVE THE LEFTI" |
Mike Poole | 31/10/2017 11:57:19 |
![]() 3676 forum posts 82 photos | I don't think my hand writing could be any worse with my left hand and I am right handed. Mike |
not done it yet | 31/10/2017 12:05:59 |
7517 forum posts 20 photos | Mike, Are you a doctor? They are, apparently, among the worst for legibility! |
martin perman | 31/10/2017 12:40:19 |
![]() 2095 forum posts 75 photos | My only difficulty was when using a Lee Enfield .303 rifle in the ATC as I had to pass my right hand and arm over the rifle to work the bolt as it was away from me. My writing is unreadable when using my right hand, I have no control. |
not done it yet | 31/10/2017 12:45:20 |
7517 forum posts 20 photos | My only difficulty was when using a Lee Enfield .303 rifle in the ATC as I had to pass my right hand and arm over the rifle to work the bolt as it was away from me. Non comprendez!
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