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Faktorer, som påvirker stram-
ningsmomentet
Stramningsmomentet virkes af man-
ge forskellige faktorer, inklusive de
følgende. Kontroller altid momentet med
en momentnøgle efter stramningen.
1) Spænding
Når batteripakningen er næsten udtjent,
mindskes spændingen, hvilket bevirker,
at stramningsmomentet falder.
Forhold ved stramning af bolte
20
(
204
)
40
(
408
)
60
(
612
)
80
(
816
)
100
(
1020
)
120
(
1224
)
140
(
1428
)
165
(
1683
)
12 3
M12
M10
M14
M16
Stramningstid (sek.)
M10, M12, M14, M16 Standardbolt
Stramningsmoment
N • m
(kgf-cm)
M10
M8
M12
M14
20
(204)
40
(408)
60
(612)
80
(816)
100
(1020)
120
(1224)
140
(1428)
165
(1683)
12 3
Stramningstid (sek.)
M8, M10, M12, M14 Bolt med stor
trækstyrke
Stramningsmoment
N • m
(kgf-cm)
Bolt
Møtrik
Skive
Stålplade,
tykkelse 10 mm
Skive
Fjederskive
Stramningsbetingelser
* De følgende bolte anvendes.
Standardbolte: Styrketype 6,8
Type med stor trækstyrke 12,9
6,8
Forklaring af styrketype
Boltstrækgrænse
(80% af trækstyrke)
48 kgf/mm
2
(68000 psi)
Bolttrækstyrke 60 kgf/mm
2
(85000 psi)
2) Stramningstid
ngere stramningstid resulterer i et
højere stramningsmoment. Overdreven
stramning er imidlertid ikke tjenligt og
forkorter værktøjets levetid.
3) Forskellig boltdiameter
Størrelsen af boltdiameteren påvirker
stramningsmomentet.
Almindeligvis stiger stramningsmomentet,
når boltdiameteren bliver større.
(Kun EY7271)
(Kun EY7271)
EY7270(EU).indb 68 2006/05/25 13:26:35
68


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