andrews_45
|
| posted on 18/4/06 at 08:13 PM |
|
|
wishbone drawing (2nd edition of book)
Phew, sorry... me again 
I have the second edition of uncle rons book, but I have read about the wishbone dimensions being out. Was this updated for the second edition? or
are these still out.
Please see pics...
I have read on other posts that in the 1st edition of the book, the wrong offset was put on the top wishbone caster. Could anybody pls confirm if
this is a updated/correct drawing that I have. Ta
Oh... and IIRC I want to be making them from 14 or 16swg?
Thanks
|
|
|
|
|
James
|
| posted on 18/4/06 at 08:24 PM |
|
|
It's the top wishbone that's out.
And yes, it's still out in the 2nd edition.
Just make the castor offset 22mm and not the 11mm that's pictured above.
Unless you're using Sierra uprights for which it should (allegedly  ) be 25mm.
HTH,
James
[Edited on 18/4/06 by James]
------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
|
|
|
flak monkey
|
| posted on 18/4/06 at 08:37 PM |
|
|
As james says.
The upper wishbone should have an offset (toward the rear of the car) of 22mm, not the 11mm shown on the diagram.
Basically make the larger dimension 132mm and the smaller one 90mm and you wont be far off.
David
Sera
http://www.motosera.com
|
|
|
SeaBass
|
| posted on 18/4/06 at 08:39 PM |
|
|
Just be careful guys those scans are in breach of a current copyright...
|
|
|
907
|
| posted on 18/4/06 at 09:07 PM |
|
|
Hi,
Yup, this is what I've used.
Paul G
 
Rescued attachment w-bones-dims-s.jpg
|
|
|
Chippy
|
| posted on 18/4/06 at 10:29 PM |
|
|
Hi all, sorry to highjack the thread, can someone confirm that when using Sierra uprights that the offset should be 25mm, because if this is so then
it's a new set of top bones I need to make. atb Chippy 
|
|
|
James
|
| posted on 18/4/06 at 10:58 PM |
|
|
quote:
Originally posted by Chippy
Hi all, sorry to highjack the thread, can someone confirm that when using Sierra uprights that the offset should be 25mm, because if this is so then
it's a new set of top bones I need to make. atb Chippy
I'm basing it on some posts/data that Mark Allanson put up in the past.
Worth checking with him.
Can you not use washers/spacers to set the castor the 3mm you need?
Cheers,
James
------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
|
|
|
britishtrident
|
| posted on 19/4/06 at 07:08 AM |
|
|
quote:
Originally posted by Chippy
Hi all, sorry to highjack the thread, can someone confirm that when using Sierra uprights that the offset should be 25mm, because if this is so then
it's a new set of top bones I need to make. atb Chippy
Just move the upper brackets as far as you can towards the rear, exact caster (or to use the term bikers use "trail" ) isn't
that critical but it must be the same both sides.
[Edited on 19/4/06 by britishtrident]
|
|
|
Syd Bridge
|
| posted on 19/4/06 at 08:54 AM |
|
|
quote:
... exact caster (or to use the term bikers use "trail" ) isn't that critical but it must be the same both sides.
[Edited on 19/4/06 by britishtrident]
ERRR......Castor and trail are two very different things.
Caster is the angle of the kingpin axis to the longitudinal vertical.(ie Viewed from the side.)
Trail is what you see on supermarket trolleys, and is the rearward setback of the axle itself from the kingpin axis. (ie. The axle c/l is not
concurrent with the kingpin c/l, but is set back from it.)
Both have very different effects. I would choose more caster every time, before I entertained 'trail'.
Cheers,
Syd. 
|
|
|
Peteff
|
| posted on 19/4/06 at 09:02 AM |
|
|
Where's the 11mm?
I make 121-102=19mm. The two measurements converted to metric don't add up to the 222mm for the overall width so use one or the other.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
|
|
|
flak monkey
|
| posted on 19/4/06 at 09:22 AM |
|
|
Offset is taken from the centreline of the wishbone. The centre of the wishbone is at 111mm (222/2).
121-111 = 10mm. So the offset actually shown in that diagram is 10mm not 11. (oops )
David
[Edited on 19/4/06 by flak monkey]
Sera
http://www.motosera.com
|
|
|
andrews_45
|
| posted on 19/4/06 at 10:31 AM |
|
|
Ah, thanks. That was where I was getting confused. So 22mm it is.
Nice one chaps ta
|
|
|
Peteff
|
| posted on 19/4/06 at 02:01 PM |
|
|
Me too..
Mine's been done 5 years and works o.k. so I'll not worry about it now .
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
|
|
|
britishtrident
|
| posted on 19/4/06 at 06:59 PM |
|
|
quote:
Originally posted by Peteff
I make 121-102=19mm. The two measurements converted to metric don't add up to the 222mm for the overall width so use one or the other.
A lot of the dimension in the book weren't converted from imperial properly -- really shows on the chained dimensions.
|
|
|
britishtrident
|
| posted on 19/4/06 at 07:03 PM |
|
|
snip
ERRR......Castor and trail are two very different things.
Caster is the angle of the kingpin axis to the longitudinal vertical.(ie Viewed from the side.)
Trail is what you see on supermarket trolleys, and is the rearward setback of the axle itself from the kingpin axis. (ie. The axle c/l is not
concurrent with the kingpin c/l, but is set back from it.)
Both have very different effects. I would choose more caster every time, before I entertained 'trail'.
Cheers,
Syd.
Actually not true but I don't argue just for the point of causing trouble.
|
|
|
MakeEverything
|
| posted on 16/10/08 at 09:43 PM |
|
|
British Trident,
Is it not 'Rake' your thinking of? As you can have Rake AND Trail on a bike.
If i remember correctly (Not wishing to start an argument)
Castor - The rotation of a single axis
Camber - Toe in or Out
Rake - The angle of an axis from another
Trail - The distance of and axis from another
I could be wrong though.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
|
|
|
MakeEverything
|
| posted on 17/10/08 at 04:11 AM |
|
|
Not many things keep me awake, but this did! Ive checked this, and i am correct. My explanation isnt very clear though...
Castor - Rotation of a single axis from vertical
Camber - Toe in or out
Rake - The longitudinal angle of an axis from vertical
Trail - the 'offset' of one axis from another (ie not in line). Measured in distance, not degrees.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
|
|
|
