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22 Dec 2005, 16:47 (Ref:1488796) | #1 | ||
Racer
Join Date: Aug 2003
Posts: 167
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Dunlop Optical Alignment gauge instructions
I'm looking for a set of instructions for the periscope style Dunlop optical alignment gauges. I think their model number is AGO/40. Does anyone have an electronic copy they could send me or point me at a link?
Thanks in advance. |
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23 Dec 2005, 00:09 (Ref:1489028) | #2 | ||
Race Official
Veteran
Join Date: May 2004
Posts: 2,479
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Just bought a set myself. Didn't get any instructions, but really they are very easy to use......
Take one large bit of flat floor and bung your car on it :-) Take one of the units and stand it beside a front wheel with the mirror/periscope end sticking out the front of the car. Set the bar clamps at the nearest stop to the height of the centre line of your wheel. then adjust the spacing so that the tips of the bars touch the front and back edge of the rim (either on the bead or on a convenient flat section). Now stand that section of the gauge on the floor away from the car and stand the other section beside it. Adjust the bars on the second section so that they are at the same height and spacing as the one you set up on the wheel. Once done, push the two sections together very carefully so that the tips of both sets of bars just touch each other. Make very sure that the units are sitting fully on their feet and the tips are just all touching. Now look down through the periscope and you should see the alignment plate in the mirror. If not rotate the mirror or the periscope on its mounting shaft, and/or rotate the periscope using the tracking adjustment arm over the gauge marks at the end. When you can see the black arrow(s) in the mirror, line them up exactly with the vertical line using the tracking adjustment arm. Now look at the graduations on the scale at the end of the gauge and the line in the plastic magnifying section. Loosen the screws holding the scale and move it so that the zero is under the line. Go back and double check that the tips of the bars are all just touching and look down the periscope to check the line is still on the black arrow. If necessary, adjust the scale back to zero again. Your gauge is now ready. Centre the steering on you car and (if you aren't on turnplates) wheel your car back an forward a bit to settle the tracking. Put each half of the tracking gauge against each of the front wheels, business end sticking out forwards, and again make sure that the tips of the bars are just touching the rims at equal points on the front and back edge. Look through the periscope and you should see the alignment mark (now quite small) has moved sideways. Adjust the periscope using the adjustment arm until the alignment arrow is back on the vertical line. Read off the toe in (above the zero line) or toe out (below the zero line) from the scale at the end in degrees and minutes (60th of a degree). This can be converted into a linear measurement (mm or fractions of an inch) for your size of wheel using the round black gauge on the aligment arm. If you want to know how to do that, pm me |
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23 Dec 2005, 08:26 (Ref:1489124) | #3 | ||
Veteran
Join Date: Jan 2003
Posts: 2,071
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spot on dtype, i would just like to add.
rear toe is checked to same way except, you fit the gauages to the rear wheels with the mirror and periscope to the rear of the car and remember that the reading are reversed, so if the gauges read toe out when on the rear the wheels are actually toeing in, but the actual figure will be correct. d type has said how to calibrate them, by putting the gauges together and zeroing them in, this is very important and needs to be done every time you use them as the design of the gauges means the calibration can easily wander. also, when checking/ using/ adjusting the car, you must keep checking the pointers are against the cars wheels. in an ideal world when checking wheel alignment you should check and compensate for wheel/ hub runout the very expensive top of the range all singing and dancing electronic machines do this automatically, the way to do this is with the dunlop gauges is take a set of readings, and move the car either backwards or forwards by one half of a wheel revolution, and take another set of readings, the true alignment figure will be an average of both figures, hopefully they will be identical, but in the real world often are not |
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