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3, DIY Toe-in angle meter
Ideas how to built a toe-in angle meter that doesn't cost a lot of money and is easy to use:
The earlier toe-in angle measure I did with a laser pointer worked but was a bit difficult to use. Is there a way to built some instrument that use some other principle ? As an educated Astrophysicist I am and knowledge of 3D-CAD design and having a 3D-Printer it must be possible, or?
This is how I did the toe-in measurement earlier, three distances and calculations.
I think almost all professional wheel angles instrument use lasers and mirrors today. High precision and expensive instrument that measure all wheel angles. I only need to measure the toe-in angle and that make it a lot easier. Here is a sketch how I thinking with a standard method to measure angles.
With a paper scale at the laser stand with the angles I can read it direct without calculations. The laser must stand at the same distance from the right wheel all time to get this to work. Longer distance get higher precision, about one meter will be enough.
3D-CAD of needed devices:
With FreeCAD I design two brackets for the pipe that hold the mirror. These two points line up the pipe with the wheel. A screw clamp around the pipe to not let it rotate, it had been better with a rectangular pipe, but round was what to be found at my place.
At the other end of the pipe is the mirror holder. It must go down under the car so the laser beam has a free passage. I made it adjustable, the long slit. IIt could be a bit longer but my 3D-Printer can't print longer details then 230 mm. I plane for a mirror size of 100 mm, square or round.
The stand and holder of the laser pointer. In the lower rectangular pocket I put a angle scale, something about +/- 1.5 degrees, the range depends of how far away the stand is from the wheel.
This old laser pointer was something I had in my boxes, now I got some use of it.
I took the pipe from some scrapped cleaning equipment, it has a diameter of 22 mm. I must also design something that clamp it to the wheel.
My mother in law had an old present gift in her boxes. She offered it to me for my repair of the car.
It has two mirrors, I use the square mirror to the right. To tale it apart I need to remove the pin that hold the two halves together.
In some way I must attach it to the instrument and its mirror holder. I can maybe glue a screw on the backside of the mirror.
I glue the screw to the backside of the mirror. The nut and washer in the background I use to lock it to the mirror holder.
With the mirror mounted on the mirror holder arm it looks like this.
From the backside with the nut and washer that hold it in place. I can move the mirror up and down to clear the car's protruding parts below the chassi.