DIY Laser Level
Just wondering over what sort of distance one of the diy laser levels
will work? I need to check a level over a couple of hundred feet and suspect that it wouldn't be powerful enough but assume that I could do it in stages by laying out some sort of peg system. Kevin |
DIY Laser Level
Kev wrote:
Just wondering over what sort of distance one of the diy laser levels will work? I need to check a level over a couple of hundred feet and suspect that it wouldn't be powerful enough but assume that I could do it in stages by laying out some sort of peg system. Mine will send the little red dot a hundred feet easily if used after dusk. Don't know how accurate it would be though. Dave |
DIY Laser Level
Just wondering over what sort of distance one of the diy laser levels
will work? I need to check a level over a couple of hundred feet and suspect that it wouldn't be powerful enough but assume that I could do it in stages by laying out some sort of peg system. Kevin Is the distance too great to consider a U-Tube that is made of normal Wine making type poly tube. I've used this method from inside to the outside of a house with the tube going out of a window. As long as you keep any rises below the two ends you wont have a problem. You can also colour the water with red or blue ink. Remember, both ends must be open to atmosphere when in use. Chris. |
DIY Laser Level
On 10 Jan 2006 02:07:39 -0800, Kev wrote:
Just wondering over what sort of distance one of the diy laser levels will work? I need to check a level over a couple of hundred feet and suspect that it wouldn't be powerful enough How accurate do you want the level over that distance? The cheap ones quote something like 1mm/m. 200' = 61m you could be 61mm out... You'll probably have fun in day light but in poor light or at night with a bit white card to follow the spot and someone to (carefully) adjust the level as you move away to the far end it shouldn't be a problem. -- Cheers Dave. pam is missing e-mail |
DIY Laser Level
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DIY Laser Level
david lang wrote: Kev wrote: Just wondering over what sort of distance one of the diy laser levels will work? I need to check a level over a couple of hundred feet and suspect that it wouldn't be powerful enough but assume that I could do it in stages by laying out some sort of peg system. Mine will send the little red dot a hundred feet easily if used after dusk. Don't know how accurate it would be though. Dave It doesn't have to be hugely accurate so it might do the job. Kevin |
DIY Laser Level
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DIY Laser Level
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DIY Laser Level
Dave Liquorice wrote:
Kev wrote: Just wondering over what sort of distance one of the diy laser levels will work? I need to check a level over a couple of hundred feet and suspect that it wouldn't be powerful enough How accurate do you want the level over that distance? The cheap ones quote something like 1mm/m. 200' = 61m you could be 61mm out... There are other factors involved over and above levelling. You'll probably have fun in day light but in poor light or at night with a bit white card to follow the spot and someone to (carefully) adjust the level as you move away to the far end it shouldn't be a problem. I expect the result will be very poor. You'd be much better off with a dumpy level. |
DIY Laser Level
Quite right, the light beam will sag over that sort of distance....
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DIY Laser Level
Phil wrote:
Quite right, the light beam will sag over that sort of distance.... Phil - WTF are you on about? Please learn to quote correctly. |
DIY Laser Level
Kev wrote:
david lang wrote: Kev wrote: Just wondering over what sort of distance one of the diy laser levels will work? I need to check a level over a couple of hundred feet and suspect that it wouldn't be powerful enough but assume that I could do it in stages by laying out some sort of peg system. Mine will send the little red dot a hundred feet easily if used after dusk. Don't know how accurate it would be though. It doesn't have to be hugely accurate so it might do the job. It won't send a little red dot a hundred feet. The cheaper units typically have a divergance of around half a milliradian. For less divergance, you need to be able to focus onto an objective, and have a bigger lens. The cheaper ones will do a spot of maybe 5cm at 100m, and this is trivial to see at dusk. |
DIY Laser Level
Ian Stirling wrote:
It won't send a little red dot a hundred feet. The cheaper units typically have a divergance of around half a milliradian. For less divergance, you need to be able to focus onto an objective, and have a bigger lens. The cheaper ones will do a spot of maybe 5cm at 100m, and this is trivial to see at dusk. Mine will shine a red dot onto the chimney of a house at the end of the cul de sac, well over 100 ft away. Granted I don't know how big the dot is, but it certainly reaches that distance. Dave |
DIY Laser Level
david lang wrote:
Ian Stirling wrote: It won't send a little red dot a hundred feet. The cheaper units typically have a divergance of around half a milliradian. For less divergance, you need to be able to focus onto an objective, and have a bigger lens. The cheaper ones will do a spot of maybe 5cm at 100m, and this is trivial to see at dusk. Mine will shine a red dot onto the chimney of a house at the end of the cul de sac, well over 100 ft away. Granted I don't know how big the dot is, but it certainly reaches that distance. True - but the dot it sends is not little. At 100 feet, you're looking at 2-3cm or so. If you're next to the dot at night, you can probably see it perfectly well until the dot gets to well over a meter. And then - looking towards the laser, it's visible when the spot is many tens of meters wide. |
DIY Laser Level
On 10 Jan 2006 02:07:39 -0800, "Kev" wrote:
Just wondering over what sort of distance one of the diy laser levels will work? Miles and miles if you can work after dark. The spot is small enough, it's just seeing it. Otherwise it's still easier to use a telescope to look at a mark in daylight. |
DIY Laser Level
Ian Stirling wrote:
david lang wrote: Ian Stirling wrote: It won't send a little red dot a hundred feet. The cheaper units typically have a divergance of around half a milliradian. For less divergance, you need to be able to focus onto an objective, and have a bigger lens. The cheaper ones will do a spot of maybe 5cm at 100m, and this is trivial to see at dusk. Mine will shine a red dot onto the chimney of a house at the end of the cul de sac, well over 100 ft away. Granted I don't know how big the dot is, but it certainly reaches that distance. True - but the dot it sends is not little. At 100 feet, you're looking at 2-3cm or so. If you're next to the dot at night, you can probably see it perfectly well until the dot gets to well over a meter. And then - looking towards the laser, it's visible when the spot is many tens of meters wide. I should have mentioned - that I've also used a laser pointer, a bit of 15mm pipe insulation to grab it, and a bit of waste pipe, to slip a laser pointer into accurate alignment with a pair of binoculars. The binoculars then form a beam expander, and greatly reduce the divergance. |
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