alfas
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| posted on 18/1/15 at 04:26 PM |
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camber change per turn/ thread of transit drag-link
situation:
live axle book locost.
camber adjustment is by upper wishbone´s transit drag-link
camber set: 1.5degree negative
favoured camber: 0.3-0.5 negative
how much turns on the drag-link i need, at least, to do, achieving a quite near result?
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Doctor Derek Doctors
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| posted on 18/1/15 at 06:53 PM |
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quote:
Originally posted by alfas
situation:
live axle book locost.
camber adjustment is by upper wishbone´s transit drag-link
camber set: 1.5degree negative
favoured camber: 0.3-0.5 negative
how much turns on the drag-link i need, at least, to do, achieving a quite near result?
All you need to know is the distance between the upper and lower ball joints and the thread pitch and it's just some trigonometry.
Designer and Supplier of the T89 Designs - Single Seater Locost. Build you own Single Seater Racecar for ~£5k.
Plans and Drawings available, U2U or e-mail for details.
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www.t89.co.uk
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callan@t89.co.uk
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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alfas
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| posted on 18/1/15 at 07:07 PM |
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trigonometry??
mathematics wasnt my best course in school....lol....
any formula? drawing?
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19sac65
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| posted on 18/1/15 at 07:32 PM |
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Here you go
http://westfield-world.com/suspension.html
Westfields use the same grag link so should be the same
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alfas
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| posted on 18/1/15 at 08:55 PM |
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perfect link!!!! thanks a lot...
"One full turn of the ball joint is equal to 1/2 of a Degree of adjustment!"
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prawnabie
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| posted on 18/1/15 at 10:26 PM |
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Thats assuming your ball joints are the same distance apart as the Westfield!
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voucht
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| posted on 18/1/15 at 10:31 PM |
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Hi,
Ok, I'm a bit late, but I had a go on the calculations tonight.
I uploaded a very simple Excel file I've made tonight and that you can download.
https://drive.google.com/file/d/0B-iOekLVikV5YkR3SHZxQVl5dTg/view?usp=sharing
Fill the cells B1 and B2 with the right values, and you will get the number of turns you need to move your drag link from a 0° camber in cell B4.
- R = distance between the lower pivot point of your upright (centre of the lower ball joint), and the intersection point between the drag
link's longitudinal axis (centre line of the threaded part) and the axis passing by the 2 pivot point of your upright (or passing by the centre
of the lower ball joint, and the centre of the ball of the upper drag link).
- Alpha is the camber angle from 0° camber (vertical axis) you want to get.
- Pitch is the pitch of the drag link thread (1,5mm in the case of a Transit drag link)
You can use only the first table if you start from 0° camber. But in your case, you start from 1,5° camber and want to achieve a 0,5° or a 0,3°
camber, so if you set the first table with the values of what you have now (position1, R and 1,5°), and the second table with the values of what you
want to achieve (position2, R and 0,3° or 0,5°), cell B11 will give you the number of turns from position 1 to position 2.
I don't know which uprights you are using, but in the case of Sierra front uprights, R is about 201mm, and the alpha, when camber = 0°, is 11°.
to have a 0,5° camber (R=11,5°), the calculation gives 1,14 turns, so it corroborates what has been said.
Hope this will help 
[Edited on 18/1/15 by voucht]
[Edited on 18/1/15 by voucht]
https://vouchtroadster.blogspot.com/
https://cafrazx550.blogspot.com/
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alfas
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| posted on 19/1/15 at 03:44 PM |
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quote:
Originally posted by prawnabie
Thats assuming your ball joints are the same distance apart as the Westfield!
thats correct...and the reality showed that it is different.
e.g. passenger side: car was set to 2.5 negative...6 turns and i´m near to 0.3 now.
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