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Old 02-23-2019, 05:52 PM   #21
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Join Date: Aug 2010
Location: Minnesota
Posts: 7,321

The machines do exactly what they think they should I would agree, but the what they read is greatly influenced by the operator setup as you mention, base calibration frequency and accuracy, and just the inherent design of how they work. Perhaps in a Nascar shop that is spotless, on and exactly true all the time rack, with perfectly true wheel perimeters, the results would be OK with a very skilled tech or engineer, but in the real world that just doesn't happen. Add to that the fact that they sell these machines as fast and easy, with .xx angle accuracy that way leads to many less than skilled operators who also aren't given enough time to do it right.

I am going to do a much more accurate check of how well the turntables do at allowing toe and camber settings without rolling. The quick check I did when I got the tables, under poor conditions seemed to show that the camber moved OK with tables and didn't change when rolled a bit on them, but I didn't test the toe for the same. I did find that even with bouncing, on the tables, you have to do it exactly the same each time to get the same result. If it stops going up one time and down the next, things change.

The good is that if you have a flat place on the driveway setup, you can set toe and camber without having the vehicle on the tables, which gives you very much better ability to drive it around the block and recheck again after it gets a true settling. Caster won't change much from a drive of very small toe or camber change, so I don't think you would even have to put it back on the tables at the end, if the caster was good before you took it off the tables. My guess is that at a certain point in the repeatability, you would get to a point of where even stuff like the shocks being warm or cold could be making the settings move enough to see.

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