PS Magazine - FEBRUARY 1973
PS, The Preventative Maintenance Monthly
1973 SERIES, ISSUE 243
FEBRUARY 1973
stand torque
laws,
torque wrenches or
how to figure the amount of torquE to use.
To get correc± torque, you gotta have
3
±Hings going for you-clEan threads, un²
damaged threads, and clean mating sur³
faces.
One point to remeMber, Podner. AftEr
x
numBr of hours, metals "set´ when
µated - drawn toget¶er - under torque
pressUre· I± takes up to
10
per cent more
power-torquE¸to break this set and get
the fastener moving than i± to¹k to get
the original torqueº
When you have ±o "check» torque, or
retorque, back off on the nut, bolt or
screw¸then bring i± back to ±he original
±orque·
A fastener
has to be turning
steady,
sMooth
force
to
get
accurate
torque· Any
herky¼jerky,
yankitiyank
Force rUins a toRque reading every tiME·
½no±¾eR
KinD
oF
"se±»
¿Ug
±¾e Àro
sQUas¾es riG¾± heRe is seizUre·
I± ¾apÁens liKe so· ½¿ou± ±he ±iMe yoU
ReÂC¾ corRec± ±orque reaDing, dÃRing ±he
LÂs± Few ±URns, yoU MÂy Ge± a ÁÄppinG efÅ
FeC± ··· ±he wrench s±ops turning·
IF ±his "se±» haÁpens, baCK oFF ±he nU±
or ¿oL± anD do yoUr ±oRQue ±hing ÂGain·
SLÄw 'nÆ s±eady does i± Un±iL yoU get ±¾e
correCt ±oRQUe reading·
ÇoLd one! NeVer, Like n¼e¼V¼e¼R, Use a
±oRQue wrenCh ±o ¿aCk ofF a fas±eneR oR
foR ±aÁping oR haMMering· I± Ruins CaLiÈ
¿Ra±ion, FoR Â fac±·
5±
Énless ±¾e ÊË says ı¾ÌRwise, alwÂys
Use the ±oRQÃe wRenC¾ on ±he nU± enD,
anD s±ÄÁ ±URninG w¾en ±¾e ±oRQUe is
ReÂC¾eD·
ÍnCe
in
ÂwhiLe,
¿eCaÃse
oF
a
±iG¾±
sÁÂCe DeÂL, yoUÆll ¾aVe ±o ±iG¾±en  ¿oL± a±
±¾e ¾ead end· I± ±ÂKes ±oRQÃe oR ÁRessÃre
±Ä Get ±¾e bÄL± MÄVinG in ±¾e ¾ole, oR ±o
aLi ne paR±s, so ±oRQue ±Ä ±¾e hiG¾ side oF
±¾e ±oRQUe range·
YoÃÆll Ge± Â MoRe aCCÃra±e ±oRQÃe ReÂd²
inG wi±¾ new fas±eneRs iF yÄÃ RUn ÆeM Ãp
±o ±¾e coRrEc± ±orQue-¿aCK ÎeM oFF Â ÏaLF
±URn-then
Re±orQue· Êhis
CLeans
Ând
sMoo±hs ±he ±¾reads sLicKerÐn a whisÑle·
Òeplace boL±s with daMaGed ±hreads, oR
reChase Ând clean ±¾e ±¾reÂDs·
IF yoà hÂVe ±o Ãse a DaMÂGeD ¿oL±, add
ex±Ra
RÃn¼UÁ
resistanCe
±Ä
±¾e
±oRQUe·
ËeÂsURe Run¼Ãp Än ±¾e Las± ro±Â±iÄn ¿e²
CÂÃse rÃs± oR a ¿Ãrr May ¾ÂVe ¿ecoMe
ÁÄLis¾eD oFF ± t¾is pÄin±·
Óhen yoà ReaC¾ ±oRQUe w¾iLe ±ig¾±enÔ
inG
CÂs±eLLa±eD
nñs,
±¾e sÂFe±y wiRe ÄR
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