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Tilstrammingsforhold
Følgende bolter er brukt.
Standard bolt: Styrke type 4,8
Meget strekkbar type 12,9
4,8
Forklaring av styrke type
Boltens bruddpunkt
(80% av strekkstyrke)
32 kgf/mm
2
(45000 psi)
Boltens strekkstyrke
40 kgf/mm
2
(56000 psi)
2) Tilstrammingstid
Lengre tilstrammingstid medfører økt
tilstrammet dreiemoment. Overdrevet
tilstramming gir derimot ingen ytter-
ligere 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.
4) Tilstrammingsforhold
Dreiemomentet for tilstramming vil vari-
ere, selv med samme type bolt ut fra
gradering, lengde og dreiemoments-
koeffisient (fastsatt koeffisient angitt av
produsent ved tilvirking).
Dreiemomentet for tilstramming vil
variere, selv med samme materiale
i bolten (for eksempel stål), ut fra
overflatens tilstand.
Dreiemomentet reduseres vesentlig
dersom bolt og mutter starter å
rotere sammen.
5) Slark i festet
Dreiemomentet reduseres dersom en
sekskantet utformingen av festet med
feil størrelse benyttes til å stramme til
en bolt.
6) Trinnløs hovedbryter (Kontrollbryter
for variabel hastighet)
Dreiemomentet blir redusert dersom
du bruker maskinen mens hovedbry-
teren ikke er fullstendig trykt inn.
7) Effekt av tilkoplet adapter
Tilstrammende dreiemoment synker
ved bruk av en universalkopling eller
et adapter for tilkopling.
Universalledd
• Mellomsokkel
VII
.
TILLEGGSUTSTYR
Borchuck
EY9HX409E
Bruk sammen med skrutrekkerbit,
treborbit eller metallborbit med
rett skaft på 1,5 mm til 10 mm
diameter.
Universalledd (finnes på markedet)
Mellomsokkel (finnes på markedet)
116


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