Does anyone have some advice or opinions they would be kind enough to share?
I need to torque my front hub nuts to 200 ft/lbs. the only torque wrench I've got goes up to around 100 ft/lbs.
I've been trying to find a suitable wrench to borrow locally (North Devon), but no luck.... so I'm wondering....
If I had a wrench 200ft long on the nut & put a 1lb weight on the other end would that give me 200ft/lbs of torque? or say a 100 ft wrench with a
2lb weight, or a 50 ft wrench with a 4 lb weight & so on & so forth, would a 3 foot spanner with 64 lbs on the end give me 200 ft/lbs of
torque???
does this make sense???
Thanks in advance to anyone who can help!!
Well that appears to be the basic principles of moments and torque etc but I've never tried that practically.
Basically yes. you are right.
I believe this is what you're after
Torque wrench extension calculator
I would trust Norbar. I used this calculator to do up the hub to strut bolts on my tintop by putting a combination spanner ring end on the desired
nut and then putiing the half inch drive of the torque wrench in the open end and jamming another spanner in the jaws to take up the slack
worked a treat... I'd never seen a 22mm spanner bent like a banana before 
[Edited on 7/8/07 by locogeoff]
I'm pretty sure that my Teng torque wrench does 280ft/lb and it only cost about £30-35!
HTH,
James
halfords do a 225lb torque wrench but costs 59.99.
http://www.halfords.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10151&productId=178621&categoryId=3
1482
All you have to do is double the length of the wrench you currently own, set it to 100 ftlbs and away you go.
If you have some large diameter tube that would fit over your wrench then your ready to do the job.
[Edited on 8/8/07 by JAG]
quote:
Originally posted by JAG
All you have to do is double the length of the wrench you currently own, set it to 100 ftlbs and away you go.
If you have some large diameter tube that would fit over your wrench then your ready to do the job.
[Edited on 8/8/07 by JAG]
Don't get obsessed with torquing things up.
200 ft/lbs = as tight as you can make it
ie jump on a 4 or 5 foot of scaffolding pole on the end of a 3/4" drive socket breaker bar
quote:
Originally posted by britishtrident
Don't get obsessed with torquing things up.
200 ft/lbs = as tight as you can make it
ie jump on a 4 or 5 foot of scaffolding pole on the end of a 3/4" drive socket breaker bar
Gentlemen,
Thank you all very much for your input! I'm gonna have a look at it again tonight & maybe just try a three foot tube on a ratchet & see
how i get on.
Am very grateful for the info!
quote:
Originally posted by Wingnut
Gentlemen,
Thank you all very much for your input! I'm gonna have a look at it again tonight & maybe just try a three foot tube on a ratchet & see how i get on.
Am very grateful for the info!
Use a breaker bar ^+1
That is the easiest way to break a ratchet.
does a torque wrench on just messure the torque you are applying and by extending the bar do you not just make it easier to achieve the same torque?
yep. if you set it to 100lb/ft then double the length it will still 'click/ping' at 100lb/ft
The only accurate way I can think of doing it if your torque wrench doesn't go high enough is with a torque multiplier.
sounds like a good excuse to get a new tool to me 
quote:
Originally posted by cadebytiger
sounds like a good excuse to get a new tool to me
right yes ic. that would make more sense. lol
What I wrote will work (although I accept you may break the wrench) check out the Norbar calculator that someone posted a link to 
no it won't!!!!!
A torque wrench clicks when you apply a load to it, if you put an extension on it then you apply that load with less effort, but the load at the
square drive peg is exactly the same!!!!
I'm afraid some basic mechanics need to be applied here!!!!
Back to the original point, yes you can hang an appropriate weight on a suitable length wrench, and this will almost certainly be more accurate than
many cheaper torque wrenches.
I use exactly this technique for setting the pinion turning torque when putting diffs together.
I have a tool that I have made that bolts to two of the pinion flange bolts, and has a short length of round bar welded to it, who's c of g
applies exactly the correct turning torque.
If you hold the bar up and then let go of it it should very slowly descend. If it doesn't, the bearing preload is too great, if it drops like a
stone, it needs more nip on the bearings.
Bear in mind this is accurate to fractions of 1 NM.
quote:
Originally posted by JAG
What I wrote will work (although I accept you may break the wrench) check out the Norbar calculator that someone posted a link to
quote:
Originally posted by scottc
The only accurate way I can think of doing it if your torque wrench doesn't go high enough is with a torque multiplier.