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Old 06-12-2016, 06:33 PM   #11
gearhead
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Yes, I'm having that conversation with the calculus teacher sitting in her recliner next to me.
I asked her if that was the hypotenuse? No just a leg.
All I can remember is the Navy lyric for opposite, angle, and hypotenuse. Not suitable for repeating. But I DO remember it.
Thanks for the help. Kick started my brain.
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Old 06-13-2016, 10:02 AM   #12
gearhead
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I think I'm good. Before the afternoon rains set in I rolled under it this morning. Used a carpenters level on top of the axle and confirmed both axles are arched. Also put the level on the bottom of the axle and measured the gap on both axles at the eyeballed center. Both showed the same gap, 250" I think it was. (I did this 5 hours ago!)
Just for the heck of it I put the level on the driveway and it was fairly level, so I measured up to the axle tube near the springs on both axles, at the center, and at the opposite end and they were consistent.
So, unless I think up something else, I'm calling it good. I should have had a regular schedule of rotating the tires.
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Old 06-13-2016, 12:09 PM   #13
JRTJH
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If I were you, I'd put that carpenter's level (6 footer) against the tires on each side of the RV. Measure the distance from the wheel lip on the forward wheel to the wheel lip on the aft wheel. Then measure on the other side of the trailer. If the axles are "parallel" that measurement would be the same. If there's any "deviation" from parallel, the measurements will differ. Assuming both axles are parallel to each other, you can also "expect" that they are PROBABLY parallel to the trailer frame rails (meaning the axle alignment is OK).

When I do that measurement, I use a adjustable square and slide it along the carpenter's level until it contacts "metal on the wheel lip" and mark that spot, then do the same on the aft wheel. The distance between those two "metal contact points" (measured on the carpenter's level) should be equal on both sides of the trailer.

Here's a picture of the type square I use:
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Old 06-13-2016, 01:12 PM   #14
gearhead
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I've got a square like that.
My level isn't a 6ft., but I can use something else.
Before alignment lasers were common we would us kite string to align the sheaves of fans to motors. No other way. String and straightedge can do a lot.
Except not align a 80,000 HP turbine to 3 end to end centrifugal compressors.
More rain.
Thanks again, good info.
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