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Torque settings, yes, heaps of threads I know. 


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Posted: Mon Feb 05, 2007 7:31 pm 
Getting Side Ways
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Posts: 3115

Joined: 20th Dec 2004

Ride: Falcon

Location: Adelaide
SA, Australia

shnoza wrote:
The 3 stage is better in my opinion, less chance of snaping the bolt and also they all are the same torque, as when you do the first one, then all the other bots, the first one will be lose again.

Its not as simple as you think. There are VERY good reasons why you do NM + angle (I wrote a long post explain why a while back). I am not going to repeat it all here but basically you do NM + angle because -

1. It is more accurate. A spec of dist/dirt/old oil/nick on the thread or rust in the block will mean that that bolt wont be pulling down as hard even if it is done up to the same torque wrench setting. The error gets much bigger the higher you have your torque wrench set, so at 30nm you might not get any difference at all but at 110nm it will be a big difference. In contrast, angles are always the same. 90 degrees on one bolt will apply the same pressure as any other bolt with the same thread pitch. So NM + angle is more accurate and even.

2. TTY bolts stretch which stuff up the torque wrench setting. It is much easier to over tighten a bolt using a final NM than a NM + angle.



Stoke me a clipper, I'll be back for Christmas

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