12 ms·

yeah its pretty hard to get new help to pull hard without fear of breaking the tool, coincidentally the beam width of a laser will increase over long distance,

by rolph 4mo ago

yeah its pretty hard to get new help to pull hard without fear of breaking the tool, coincidentally the beam width of a laser will increase over long distance, similar to line slack sagging over long distance.

dotancohen 4mo ago
The DeWalt that I've been using recently had a bright green line pencil thin, in the sun, easily ten meters from the device. That's far enough to do an entire patio - ten meters in each direction. I don't know about longer needs, such as sidewalks, but for building construction the DeWalt was excellent. I've never tried other brands.
- rolph 4mo ago
  the really serious guys use GPS based equipment, and its serious stuff, being able to center up on a 1/64 inch brad tacked into the asphalt. [that 50,000$ ufo on a tripod by the highway, dont try to steal one, man do they ever know exactly where they are] yeah i like team yellow too :) the beam spread is what you want to check out if your serious about > 100 ft distance https://www.gpsalaska.com/ https://www.gpsalaska.com/ ^ this is a very commercial website, but example of higher end equipment and technique
  - srean 4mo ago
    How do you calibrate the GPS
    - rolph 4mo ago
      there is a sattelite network, and a terrestrial reference station infra
      - srean 4mo ago
        Yeah but how do we know there distances accurately
        rolph 4mo ago
        usually laser ranging is used to establish a baseline, rather than using a theodolite and chain like OG surveyors. the rest is trigonometry, withe the GPSS defining points relative to the baseline. https://www.gps.gov/trilateration https://www.gps.gov/trilateration https://apps.dtic.mil/sti/html/tr/ADA165932/index.html https://apps.dtic.mil/sti/html/tr/ADA165932/index.html https://app.studyraid.com/en/read/15241/528230/determining-distances-with-triangulation https://app.studyraid.com/en/read/15241/528230/determining-d...

by rolph 4mo ago

dotancohen 4mo ago

The DeWalt that I've been using recently had a bright green line pencil thin, in the sun, easily ten meters from the device. That's far enough to do an entire patio - ten meters in each direction. I don't know about longer needs, such as sidewalks, but for building construction the DeWalt was excellent. I've never tried other brands.

rolph 4mo ago
the really serious guys use GPS based equipment, and its serious stuff, being able to center up on a 1/64 inch brad tacked into the asphalt. [that 50,000$ ufo on a tripod by the highway, dont try to steal one, man do they ever know exactly where they are] yeah i like team yellow too :) the beam spread is what you want to check out if your serious about > 100 ft distance https://www.gpsalaska.com/ https://www.gpsalaska.com/ ^ this is a very commercial website, but example of higher end equipment and technique
- srean 4mo ago
  How do you calibrate the GPS
  - rolph 4mo ago
    there is a sattelite network, and a terrestrial reference station infra
    - srean 4mo ago
      Yeah but how do we know there distances accurately
      - rolph 4mo ago
        usually laser ranging is used to establish a baseline, rather than using a theodolite and chain like OG surveyors. the rest is trigonometry, withe the GPSS defining points relative to the baseline. https://www.gps.gov/trilateration https://www.gps.gov/trilateration https://apps.dtic.mil/sti/html/tr/ADA165932/index.html https://apps.dtic.mil/sti/html/tr/ADA165932/index.html https://app.studyraid.com/en/read/15241/528230/determining-distances-with-triangulation https://app.studyraid.com/en/read/15241/528230/determining-d...