Talk:Laser line level

The articles on "laser level" and "laser line level" were identical, apart from a brief introductory sector in line level. I'm no expert (I looked this up because I wanted information) but this seems dead wrong. My understanding is that a "laser level" creates a dot at a position somewhere. The use of a staff and possibly sensor makes it useful specifically for surveying. Some (all?) laser levels use a rotating mechanism covered by the patent quoted.

A "laser line level" is laid against a flat surface (typically wall) and projects a line of light along the wall, with no moving parts involved. If the device is aligned properly using a built-in sprit level, the line will be truly horizontal, or truly vertical, to within a specified margin of error.

Maybe someone with more expertise will fix up these articles? Pol098 (talk) 18:28, 10 June 2008 (UTC)

All these years I've been calling my laser line level a laser level. Actually, I've been calling it an electric chalk line, since I use it only for drawing straight lines on fabric. The key is to watch the sparkles on the pen, not the sparkles on the fabric, and make dots an inch or so apart.

I'd like a little more detail as to *how* a ray is converted into a sheet of light. I'm quite certain that nothing in there is spinning -- AA cells would not last so long if they had to run a motor.

98.206.86.187 (talk) 02:37, 25 May 2014 (UTC)
 * Obviously an article this short is rather scant on details for nearly everything.
 * There are two sorts of laser level used in construction. One scans, one doesn't.
 * Some (non-scanning) use a laser with a line generator lens - usually two lasers and two lenses. A line generator lens is a small section of a plano-cylindrical lens. It turns a simple straight line parallel beam into a fan-shaped plane beam. The overall tool is a box with a large window in one side. Inside is a pendulum carrying the laser and lenses, so that it's self-levelling. One of the laser-lens pairs gives a vertical fan, the other a horizontal fan. If you face the level against a wall, it projects a cross shaped pair of lines on the wall. Great for tiling - it's what I mostly use mine for.
 * The second sort has a rotating mirror. The laser projects along the axis of a rotating mirror head and the mirror projects this accurately perpendicular along a radius. With the motorised scanning, this is a flat disc of light. Simple ones have a vertical axis, thus a horizontal disc. Some have a second head to project a vertical plane. As the beam (presumably from the same source laser) is a fan in one type and a whole disc, spread over time, in the other then the fan-beam types are much brighter to use.
 * As to battery life, then my scanning head level is a cheap and cheerful design using a rubber band to drive the head. Battery life with 4×AA is usually longer than the failure time of the rubber band! Andy Dingley (talk) 10:27, 25 May 2014 (UTC)

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