Salutare.
Am si eu o chestie care ma macina de ceva vreme si am vazut ca pe forumul vostru se pot discuta chiar si probleme care nu au de-a face cu masinile. De aceea doresc sa vin si eu cu o intrebare la care sunt curios ce fel de argumente voi primi
Asadar, sunt curios daca stie cineva de ce s-a standardizat sensul de strangere a unui surub in sensul acelor de ceasornic si evident destransul in sens invers. Exista o explicatie stiintifica sau raspunsul e simplu, "de aia!" ?
Multumesc.
Full Version: Surubul
sensul in care stringi un surub e sensul in care apa se invirteste cind se scurge prin teava de evacuare (in emisfera nordica). de ce au ales ca sensul in care desfaci surubul sa fie taman invers, cred ca doar din motive de comoditate 
Geniala intrebare, genial raspuns! "Love to accelerate", bine ai venit pe forum.
QUOTE (LUV2XLR8 @ Jun 20 2009, 09:43 PM) 
Salutare.
Am si eu o chestie care ma macina de ceva vreme si am vazut ca pe forumul vostru se pot discuta chiar si probleme care nu au de-a face cu masinile. De aceea doresc sa vin si eu cu o intrebare la care sunt curios ce fel de argumente voi primi
Asadar, sunt curios daca stie cineva de ce s-a standardizat sensul de strangere a unui surub in sensul acelor de ceasornic si evident destransul in sens invers. Exista o explicatie stiintifica sau raspunsul e simplu, "de aia!" ?
Multumesc.
Am si eu o chestie care ma macina de ceva vreme si am vazut ca pe forumul vostru se pot discuta chiar si probleme care nu au de-a face cu masinile. De aceea doresc sa vin si eu cu o intrebare la care sunt curios ce fel de argumente voi primi
Asadar, sunt curios daca stie cineva de ce s-a standardizat sensul de strangere a unui surub in sensul acelor de ceasornic si evident destransul in sens invers. Exista o explicatie stiintifica sau raspunsul e simplu, "de aia!" ?
Multumesc.
exista si surub "pe invers". depinde de aplicatii.
QUOTE
The right-hand rule of screw threads.
The helix of a thread can twist in two possible directions, which is known as handedness. Most threads are oriented so that a bolt or nut, seen from above, is tightened (the item turned moves away from the viewer) by turning it in a clockwise direction, and loosened (the item moves towards the viewer) by turning counterclockwise. This is known as a right-handed (RH) thread, because it follows the right hand grip rule (often called, more ambiguously, "the right-hand rule"). Threads oriented in the opposite direction are known as left-handed (LH).
By common convention, right-handedness is the default handedness for screw threads. Therefore, most threaded parts and fasteners have right-handed threads. Left-handed thread applications include:
* Where the rotation of a shaft would cause a conventional right-handed nut to loosen rather than to tighten due to fretting induced precession. Examples include:
o The left hand pedal on a bicycle.
o The left-hand grinding wheel on a bench grinder.
o The lug nuts on the left side of some automobiles.
* In combination with right-handed threads in turnbuckles.
* In some gas supply connections to prevent dangerous misconnections, for example in gas welding the flammable gas supply uses left-handed threads.
* In some instances, for example early ballpoint pens, to provide a "secret" method of disassembly.
* In some applications of a leadscrew, for example the cross slide of a lathe, where it is desirable for the cross slide to move away from the operator when the leadscrew is turned clockwise.
The term chirality comes from the Greek word for "hand" and concerns handedness in many other contexts.
The helix of a thread can twist in two possible directions, which is known as handedness. Most threads are oriented so that a bolt or nut, seen from above, is tightened (the item turned moves away from the viewer) by turning it in a clockwise direction, and loosened (the item moves towards the viewer) by turning counterclockwise. This is known as a right-handed (RH) thread, because it follows the right hand grip rule (often called, more ambiguously, "the right-hand rule"). Threads oriented in the opposite direction are known as left-handed (LH).
By common convention, right-handedness is the default handedness for screw threads. Therefore, most threaded parts and fasteners have right-handed threads. Left-handed thread applications include:
* Where the rotation of a shaft would cause a conventional right-handed nut to loosen rather than to tighten due to fretting induced precession. Examples include:
o The left hand pedal on a bicycle.
o The left-hand grinding wheel on a bench grinder.
o The lug nuts on the left side of some automobiles.
* In combination with right-handed threads in turnbuckles.
* In some gas supply connections to prevent dangerous misconnections, for example in gas welding the flammable gas supply uses left-handed threads.
* In some instances, for example early ballpoint pens, to provide a "secret" method of disassembly.
* In some applications of a leadscrew, for example the cross slide of a lathe, where it is desirable for the cross slide to move away from the operator when the leadscrew is turned clockwise.
The term chirality comes from the Greek word for "hand" and concerns handedness in many other contexts.
Sursa: Wikipedia
Deci raspunsul la intrebarea ta este: "ca asa au vrut ei sa se inteleaga" dar exista si exceptii de la regula atunci cand nu ar fi posibila folosirea "regulii"
Deci raspunsul la intrebare este 'pentru ca majoritatea folosim mana dreapta' si 'dar exista si exceptii' :-)
QUOTE (20krpm @ Jun 20 2009, 10:26 PM)
sensul in care stringi un surub e sensul in care apa se invirteste cind se scurge prin teava de evacuare (in emisfera nordica). de ce au ales ca sensul in care desfaci surubul sa fie taman invers, cred ca doar din motive de comoditate
Fabulos! Nota 10.
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