threaded rod ends.........

[cfditya]

hello.....

I know that most of racing series in the globe...especially fsae ,use threaded rodend bearings in the suspension control arms....to make quick adjustments to camber,toe n stuff.....i have seen images of these.....but cant figure how they make adjustment using this setup.....can you guys explain how the adjustment is made.....i know its simple but just can figure how its done.....thanks.....

[nae]

its just a threaded bar with a left hand thread on one end and a right on the other, with either a hole or a hex bit left in the middle to drive it.

[DaveKillens]

That is referred as a turnbuckle.
http://en.wikipedia.org/wiki/Turnbuckle

[cfditya]

That is referred as a turnbuckle.
http://en.wikipedia.org/wiki/Turnbuckle

ya thanks that has given me a good idea......

But i have another clarification......say the threded rod ends are attached to the uprights through hex bolts......and assume one complete revolution[360 degrees] of rod end bearing is equal to 1 degree of camber change......

Now if i want half a degree of camber change then going by the assumption, i need to rotate the rodend through 180 degrees.but this would be impossible attaching this end to the upright because the axis of the bolt and bearing would be perpendicular......Assuming im right.......What is the remedy???.....or wht do the mechanics do??????

Thank you

[DaveKillens]

You turn the barrel of the turnbuckle enough to achieve the desired geometry. Usually, there are locknuts on the end of each barrel, or the barrel has some form of positive stop mechanism.
Alternatively, and this almost defeats the turnbuckle, is to disconnect one end, rotate it 180 degrees, and re-attach it.

[Carlos]

Bits & pieces of varied sorts for suspension ( rod end bearings, thingies and much more ) - from aircraft supply firm:

http://www.aircraftspruce.com/

[RacingManiac]

other ways of using the turnbuckle includes using 2 rodends with the same pitch direction(for example, 2 right handed), but with different pitch value with one more coarse than the other, you get ultra fine adjustment...

Most race cars I think uses turnbuckle for toe, rideheight(on push or pull rod), and caster adjustment(rod end on one link of an a-arm), and uses shim for camber. This is how our FSAE car does it. F1 car I think uses shims almost exclusively....

[ginsu]

That is referred as a turnbuckle.
http://en.wikipedia.org/wiki/Turnbuckle

Now if i want half a degree of camber change then going by the assumption, i need to rotate the rodend through 180 degrees.but this would be impossible attaching this end to the upright because the axis of the bolt and bearing would be perpendicular......Assuming im right.......What is the remedy???.....or wht do the mechanics do??????

Thank you

If you want more granular adjustment then 180 deg, you can thread the rod end into another threaded piece that then threads into a swedge tube. They have a picture of it in Allan Staniforth's "Competition Car: Suspension' book.