Hi. I need to tighten a Driveshaft nut to 300Nm which is beyond my Torque wrench. I propose using a lever and my body weight but am unsure of the calculations. I think it is :
Weight = 94KG = 940N (I believe 1Kg mass has a 10N weight at 1g (gravity)? )
So to achieve 300Nm: Distance = Target Torque / Force So: Distance = 300Nm / 940N = 0.32 ( 32cm from centre of Nut to where my body weight it applied)
Is this calculation correct ? Thank you, Steve
Yes. The odds of you managing to apply your weight at the right point are probably low but Torque-bolt tension is a +-25% thing anyway so you should be as close as makes no odds.
SandS ( snipped-for-privacy@jktowers.fsnet.co.ukX) gurgled happily, sounding much like they were saying :
No, but given that (I assume) you know how heavy you are, lb/ft makes it fairly easy to figure down the lever you need to stand...
You should be able to hire a suitably beefy torque wrench for about £16 for a weekend, look in Yellow Pages.
Chris
Yep.
Given that he's weighed himself in Kg converting to lbs doesn't help.
However as Dave said the basic calculation is correct.
g = 9.81 Thereforce, body weight = 922N => 31cm
This isn't the bolt on the front end of an (older) BMW is it? A dodge I heard was to put the car in 1st, get someone to stand on the brakes while you (or some gorilla) torques up the bolt. Doesn't work of course - the clutch slips first!
Here's a hair -------------- do you want to split it?
and they claimed going metric would make things easier :-}
what's wrong with foot/pounds?
ttyl
akia
SandS wrote:
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