Hope this isn't too OT - I did think electroncs and/or auto ng but this has a
strong element of diy - so here goes.
After my not-so-local tyre place fitted and balanced some new tyres (good job,
no complaints there) they did a free track aligment check and of course it was
out. When I asked by how much they said an amazing (to me) 4mm. Given that the
old tyre tread wear pattern was even and steering direction rock steady (no
wander or drift), I stupidly agreed to them resetting it (with their wonder
laser kit). Of course, now the car wanders nicely to the left and I have to keep
the steering wheel right-hand down slighty to go straight ahead. Well, just
returned from my 4th visit to them to try and correct this and I'm well and
Searching the web last night there were a couple of article by folk who'd had
exactly the same problem outlined above and made their own Heath-Rob settup with
excellent results (so they claim). Setup was some wooden planks, paint-tins to
act as pedestals and bits of string! (No kidding). One claimed 1/32" accuracy by
some devious way of reversing the planks to cancel the error.
Now to the diy bit.
I wonder if it may be possible to diy ones own track kit using a laser! At first
that sounds expensive, but as a source, I thought a simple laser pointer device
(~£20) may do the job. A photo detector is easy to rig-up in a lightproof can -
connected to as a microammeter to detect peak of laser alignement.
As to the mechanics of it all - I'm still trying to learn what it does exactly.
Toe-in concept is easy enough - but as to measureing it it accurately - well,
that's not so easy of course. I guess two parallel laser lines down the side of
the car is a starting point - maybe some sort of collimator to ensure alignment
and mirror or prism to turn the right-angles. Measuring from beam to wheel-rim
could simply use a steel rule. (And always wear laser-safe goggles of course).
Well that's as far as I'm taken the idea. Any comments, ideas, etc?