Laser Tracking tool plans

first installment dosen't show all the details of wheel prongs -- trad 3 views with full dimensions to follow in a few days.

Protype works well and is highly accurate

Material require
25x25 RHS
15mm plywood
9"x9" mirror tyle
Pocket laser level from Woolies.

This was the original concept drawing I did just befoe xmas.

All looks very interesting....how do you decide the scale ie for degrees??? Surely the wider the track the bigger the gaps between the degrees eg small track - 1 2, wider track - 1 2
Not sure if that makes sense or not.....Cheers Oli.

[Edited on 26/1/06 by oliwb] - why wont it edit properly!! should be about 4 spaces between the second 1 & 2......Oli.

[Edited on 26/1/06 by oliwb]

Looks good
Questions as per Oliwb and out of interest what should a seven be set to, toe in, toe out or parallel?

Cheers

Alex
PS
Any good sources for the laser?

Think about 1 degree negative camber (closer at top), dunno about castor - as much as you can i think....and a couple or less degrees toe-in I believe...I'm sure someone will correct me if thats b*ll*cks....Oli.

Left side unit --- rightside and details to folow.

Re scale easy measure in mm and do trig -- easy to work out gauge factor for any cars being worked on.

Locost typically are set in the range zero to 1/16" toe-in across the axle.

After being zeroed before each use error at zero degrees toe-in is very close to zero % as the reflected laser returns back along it original path.

how do you zero in the laser? do you just put both sides together & would this take out any inaccuracy in the building of the jig?


apart from guess work, how do you figure out which wheel to adjust?

Thats it -- simple --- zero set should be checked before each use.
Dunlop made a similar tool using a periscope/tellescope but using a laser does away with the need for optics.
Sealey do some similar

http://www.justoffbase.co.uk/s.nl/sc.9/category.200/it.A/id.5156/.f

Very good idea, I like it!

However to zero it you really want the lazer and mirror as far apart as possible. Therefore use a length of bar or broom handle etc to ensure the distances between each side are the same.

John

I like it,the simplest ideas are the best.

I have been looking at the different builders lasers in the DIY stores for ages to try and work something out,wel done.
It seems to be a mixture of the older and newer types of alignment tools used in garages.