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ramp

S

schrade

Member
Boss just bought a building and is wanting a ramp to drive into it. Wandering how to figure out the angle for ramp. Will be used for tow motor access and car storage. Door is about 4 feet above ground.
 
I'm not entirely sure what you're looking for but will offer this. The tangent function of an angle is the opposite over the adjacent, or, in terms of your ramp, the rise over the run. For example, it the rise is 4' and the run of the ramp is 8', then arctan 4/8 = 26.56 degrees. Arctan is the reciprocal of tangent function. So in this example, the ramp would have a 26.56 degree angle relative to the horizontal. Help?
 
Go out 16ft, longer of possible. Too short and the bottom of the lift will catch at the top of the ramp, and the bottom of the mast and/or the bottom of the counter weight will hit at the bottom of it. (Unless its a big off road type lift) We have one ramp at work that's 9ft out from the dock, every lift we have hits like I mentioned.
 
I think at 16' a car would not clear to get in, luckey for to work with 32', might even need 48' so it would not bottom out. Remember a car only has about 6" of ground clearance
 
if your in an ice and snow area you should not go steeper than a 10% grade---which would make the ramp 40 ft long
 
You have two things to consider: How steep the ramp is and how much clearance you have when a vehicle goes over the peak. Obviously the lower the grade the better, but you probably don't have room to build an eighty foot long ramp, which would give you a nice five percent grade. So let's think about what's the steepest ramp you can have without having a vehicle high-center as it enters the building.

Let's assume you have a vehicle with 6 inches of ground clearance midway between its axles and a 140 inch wheelbase. The vehicle will high-center if it goes over the top of a ramp where the peak is 12 inches higher than a point on the ramp 70 inches from the peak. (We double the six inch ground clearance because the front wheels are on the shop floor. And of course 70 inches is half the 140 inch wheelbase.) So that means the ramp would have a grade of 12/70 = 0.17. So a four foot high ramp would be 4/.17 = 23.5 feet long. You can substitute the actual ground clearance and wheelbase numbers of your boss's vehicles to find the steepest grade his vehicles will be able to handle.
 
Try a newer model low slung type car and see how it will do. Town here had to redo driveway aproches after they had rebuilt the road-sidewalks and the people could not get into their driveways because the cars were bottoming out trying to get in.
 
(quoted from post at 19:32:52 06/22/16) if your in an ice and snow area you should not go steeper than a 10% grade---which would make the ramp 40 ft long
Click to expand...

I agree. Build that ramp as long as possible.
 
I would wager since it only sit 3" off of the ground that thats lower than most newer cars. Wheelbase does look much different than my Buick.
 
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