Adjusting Headlight on a slope
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Road Captain
Joined: May 2012
Posts: 528
Likes: 0
From: Bel Air, MD
Adjusting Headlight on a slope
How can I check the adjustment on my headlight without having 25' of level surface. My garage is only 20' deep and the drive starts to slope away at the garage entrance as well as the garage must slope too.
With my front axle at 25' my rear axle would be 6.5" below level and my front 5.5" below level. Say I set the rear tire on a board giving me about 1" more height it would justify the bike; could I then mark my alignment position on the wall 5.5" lower then the calculated height per the service manual and make necessary adjustments?
With my front axle at 25' my rear axle would be 6.5" below level and my front 5.5" below level. Say I set the rear tire on a board giving me about 1" more height it would justify the bike; could I then mark my alignment position on the wall 5.5" lower then the calculated height per the service manual and make necessary adjustments?
Tourer
Joined: Mar 2010
Posts: 430
Likes: 2
From: Dirty City
Take the ratio of distance to wall versus suggested distance, and apply that to the measured drop.
So if you're 20 feet away when the suggestion is 25 feet, that's 80%. So multiply the suggested drop in the beam height by 0.8. If you're 15 feet from the wall, multiply the suggested rop in beam height by 0.6
Additionally, acamj's suggestion to go diagonally is a solid one.
So if you're 20 feet away when the suggestion is 25 feet, that's 80%. So multiply the suggested drop in the beam height by 0.8. If you're 15 feet from the wall, multiply the suggested rop in beam height by 0.6
Additionally, acamj's suggestion to go diagonally is a solid one.
Last edited by Ovaltine Jenkins; May 7, 2013 at 10:35 AM.
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Road Captain
Joined: May 2012
Posts: 528
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From: Bel Air, MD
That won't get me much more distance. Big house and small garage, when we were looking at homes there were very few with large garages around here, at least in our price range! With my Dakota in the garage and the door closed you have about 2 1/2' to walk behind it. The only way you could get 2 cars inside my garage is if you had absolutely nothing else inside the garage; it's about 20' x 20". I'm done venting about my garage now, at least I have one!
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Cruiser
Joined: Mar 2013
Posts: 201
Likes: 4
From: newark
Take the ratio of distance to wall versus suggested distance, and apply that to the measured drop.
So if you're 20 feet away when the suggestion is 25 feet, that's 80%. So multiply the suggested drop in the beam height by 0.8. If you're 15 feet from the wall, multiply the suggested rop in beam height by 0.6
Additionally, acamj's suggestion to go diagonally is a solid one.
So if you're 20 feet away when the suggestion is 25 feet, that's 80%. So multiply the suggested drop in the beam height by 0.8. If you're 15 feet from the wall, multiply the suggested rop in beam height by 0.6
Additionally, acamj's suggestion to go diagonally is a solid one.
Given a normalized light vector l (pointing from the light source toward the surface) and a normalized plane normal vector n, one can work out the normalized reflected and refracted rays:
Note: 
must be positive. Otherwise, use
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Thread Starter
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Road Captain
Joined: May 2012
Posts: 528
Likes: 0
From: Bel Air, MD
YOU NEED TO TAKE INTO ACCOUNT THE REFRACTION OF LIGHT FOR CHANGING THE DISTANCE. HERE IS A SIMPLE FORMULA TO HELP:
Given a normalized light vector l (pointing from the light source toward the surface) and a normalized plane normal vector n, one can work out the normalized reflected and refracted rays:
Note: must be positive. Otherwise, use
Given a normalized light vector l (pointing from the light source toward the surface) and a normalized plane normal vector n, one can work out the normalized reflected and refracted rays:
Note: must be positive. Otherwise, useThanks Gunner.... I'll get right on that!!!!!!!!!!!!!!!!
