Friday, March 21, 2014

FM Toe Bar Calibration

The Flyin’ Miata hub stands facilitate toe measurements using a tape measure underneath the suspension components and body parts. The tape is stretched between the bars on opposite sides of the vehicle. First you have to “calibrate” the bars…

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With the hub plate attached to the axle you pivot the bar using the adjusting knobs to make it parallel to the wheels (as shown below) . Flyin’ Miata recommends using a laser pointer held against the face of the wheel hub as a reference.

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After quite a few “fits and starts” I’ve developed a calibration routine that works well for me. Instead of reviewing all my failed efforts I’ll just jump ahead the successful one here. The calibration of the FM toe bar required making a set of “spacers” to clamp between the hub plates and hubs to create a large stable base for the laser line level. Purchasing a high quality Bosch line and point laser made a huge difference as well!

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Clamping a set of hook rulers to the toe bar measurement points and using the “trailing edge” of the laser line results in the high visibility and repeatable results shown in the images below. Especially important is fact that this “evolved” system allows the user to operate in a nearly “hands free” manner while adjusting the bar.

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With the toe bars calibrated it is on to measuring toe!

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