Front Upper Wishbone Jig

[peter2482]

has any one had any problems with this jig? i have made it to the book dimensions, but it seems to be 6mm short, as to get the dimensions on the wishbone right, the 30mm diameter piece would come to the back of the 6mm plates not the front, am i being stupid? :o

[HandyAndy]

Hi,
i know you have said you have made the jig to the book dimensions but as the figure of 6mm seems to be the issue are you sure you have placed the 2 stand plates 5mm in from the edge at the 82degree angle ? as this maybe where the 6mm problem is coming from.

cheers
andy:)

[peter2482]

i will have to recheck it tomorrow as its at work, but im sure i have it as it should be, the only thing i can think of is i have used a piece of 30mm box instead of 25.
:confused:

[HandyAndy]

it,ll be interesting to find the cause, do you HAVE 30mm box tube in your workshop?
my thoughts were the 5mm of the 2 upright plates plus the lean angle of 82 degree,s would create a 6mm error if its placed incorrectly on the jig.

cheers
andy:)

[peter2482]

we have loads of different sizes at work ;) lol all to heavy walled for the chassis, but perfect for jigs etc. maybe i used a bit of that instead.
i set the plates 5mm in then tacked them on and tapped them over to 82 degrees, it is 5mm to the back edge of those plates isnt it...

[HandyAndy]

yes it is 5mm from the edge,
just thought of another poss reason.... those plates need to be 6mm thick, otherwise the dimensions would be wrong unless you compensated for a different thickness of the plates:eek:
just a thought;)

andy

[AshG]

i wouldnt worry too much. you have loads of adjustment on the upper ball joint so if its a mm out you can just ake it up with the ball joint

[HandyAndy]

any news on what the problem was with the jig?

cheers
andy

[peter2482]

hi andy, after checking and rechecking everything it all seems to be as it should be, just me being dumb i think :o i used 25x5mm flat instead of the
6mm plate, and didnt allow for it,
now i have finished making the jigs, im ready to start making wishbones :eek:

[HandyAndy]

hi andy, after checking and rechecking everything it all seems to be as it should be, just me being dumb i think :o i used 25x5mm flat instead of the
6mm plate, and didnt allow for it,
now i have finished making the jigs, im ready to start making wishbones :eek:

at least you got it sorted out, nice one, get the bones made & you,ll soon have a rolling chassis:cool:

cheers
andy

[filip arvidsson]

Hi!
I'm a bit confused about the measurements for the jig.
The jig-plate is 285 with a 25 tube on it =260mm
The angled plates are 5mm in and 6mm thick =249mm
The length of the wishbone is 253mm

Am I just thinking wrong or isn't this quite correct?

Thank you
//Filip Arvidsson

[filip arvidsson]

I would appreciate some clarification before welding them up, anyone?
//Filip

[ozzy1]

Sounds and looks correct to me.Just note that the two 25 x 6 plates are angled at 82'
P61 fig 5.9 shows 236mm + you need to add half the 33.7 to get the overall dimension of 252.85(253)

[filip arvidsson]

Ah, excuse me but what is correct?
If I make the wishbone in the jig it will be 249, should I alter it to allow 253?
Thank you
//Filip

[alga]

Don't worry too much about what is correct, it will not have much practical influence as the camber adjuster will compensate.

[Bonzo]

Hi Filip

I have just measured my upper front wishbones & they are 249mm long .... Made as per jig.

They have been test fitted to the car & are fine .... Plenty of adjustment left & penty of rod end thread, engaged in the wishbone boss.

You are correct .... The drawing on page 61 does indeed show an overall wishbone length of 253mm ( Rounded up )

This has probably left you even more confused but to be honest, there is so much adjustment there.
4mm is neither here nor there !!

If you want more thread in the wishbone boss, make them 253mm.

I don't know if others have measured theirs ??

Hope this is of some help

[filip arvidsson]

Thank you, now I'll just have to decide on doing it 249 or 253.
Cheers
//Filip