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Faktorer som påvirker dreie-
momentet for tilstramming
Dreiemomentet for tilstramming påvirkes
av en rekke faktorer, inklusive følgende.
Etter tilstramming bør du alltid kontrollere
dreiemomentet med en momentnøkkel.
1) Spenning
r batteripakken blir nesten utladet,
synker spenningen og dreiemomentet
for tilstramming reduseres.
Tilstrammingsforhold for bolter
20
(
204
)
40
(
408
)
60
(
612
)
80
(
816
)
100
(
1020
)
120
(
1224
)
140
(
1428
)
165
(
1683
)
12 3
M12
M10
M14
M16
Tilstrammingstid (sek.)
M10, M12, M14, M16 Standard bolt
Dreiemoment tilstramming
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
Tilstrammingstid (sek.)
M8, M10, M12, M14 Meget strekkbar bolt
Dreiemoment tilstramming
N • m
(kgf-cm)
Bolt
Mutter
Mellomskive
Stålplate tykkelse
10 mm (3/8")
Mellomskive
Fjærskive
Tilstrammingsforhold
* Følgende bolter er brukt.
Standard bolt: Styrke type 6,8
Meget strekkbar type 12,9
6,8
Forklaring av styrke type
Boltens bruddpunkt
(80% av strekkstyrke)
48 kgf/mm
2
(68000 psi)
Boltens strekkstyrke 60 kgf/mm
2
(85000 psi)
2) Tilstrammingstid
Lengre tilstrammingstid medrer økt
tilstrammet dreiemoment. Overdrevet
tilstramming gir derimot ingen ytterligere
effekt, og reduserer verktøyets levetid.
3) Forskjellige boltdiametre
Størrelsen på boltens diameter påvirker
tilstrammet dreiemoment.
Generelt er det slik at når boltens
diameter øker, heves dreiemomentet for
tilstramming.
(Kun EY7271)
(Kun EY7271)
EY7270(EU).indb 86 2006/05/25 13:27:01
86


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