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Setting Initial Grade and Benchmark

9:52
24:42
277.8K views

At 9:52 in

How to use a Rotary Laser (sponsored by Dewalt)

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What happens here

On an outdoor job site, the presenter demonstrates setting an initial grade for a construction project. He explains that you don't need to perfectly level the rotary laser initially; just get it 'somewhat close'. After powering it on, the DeWalt laser automatically levels itself. He then establishes a benchmark by placing a concrete block and uses the grade rod and receiver to determine the laser line's height relative to the top of the block. He records this height (3 feet 5.5 inches). This benchmark will be the reference point for all subsequent measurements for setting footings.

Goal: Establish a precise reference point (benchmark) for all future elevation measurements.

Tools and materials

  • Concrete Block — A stable object to serve as the benchmark point
  • DeWalt Rotary Laser DeWalt — Providing a rotating laser beam for leveling
  • Grade Rod — Measuring height with the receiver
  • Green Laser Goggles — Protecting eyes if looking directly into the laser beam
  • Receiver DeWalt — Detecting the laser beam on the grade rod
  • Tripod — Holding the rotary laser steady

What they say

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footing you got your laser you don't know what your elevation is you set it up and it won't start well it's not going to start like this like you literally just gotta get this thing somewhat close eyeball it and then come in a little tight we hit the Go button right here and this laser will automatically level but if you're too far out of spec it won't know Sam can you see this part right in here because what we're doing what it's doing right now is it's attempting to level itself I may have it too far out of spec I literally just slapped it down and this is trying to figure it stride a correct for the crap that I just did we'll see if it well there it goes so now that means that this thing take a look at let's look at it from the top down lunch I want to show these guys you see how far out how far over the dad is that's kind of an indicator of how far away we are from it but now let's talk about we got the laser setup rotary laser dude not laser rotary laser we know we're operating but we've got to dig how far down did we dig with this one Tim toy feet we dug 20 feet deep that's that's what Tim Cove is way too so do you have a benchmark set up no sir alright so what we're gonna do actually we've got a bottom of footing right here a typical construction site can go guys we're gonna use the top of the first block now in this case I'm just doing using this as a demonstration of

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