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?

[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.

[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
just a thought

andy