DIY Laser levelling using webcam and laser level

[devmonkey]

Hi Bert,

Sounds like it is working for you, fantastic. What laser and camera are you using? Are you sure of the units, i.e. did you set the um per pixel?

I'm assuming you moved the machine frame to meet the laser plane to get the corners so close, adjustable feet?

My 6 inch concrete slab also looks like jelly with this system.

Joe

[driftspin]

Hi Bert,

Sounds like it is working for you, fantastic. What laser and camera are you using? Are you sure of the units, i.e. did you set the um per pixel?

I'm assuming you moved the machine frame to meet the laser plane to get the corners so close, adjustable feet?

My 6 inch concrete slab also looks like jelly with this system.

Joe

Today i got to some measuring again.

About my setup.

I have a cheap bosch crosshair laser which I now know is not up to this task.

The webcam is a 1920x1080 6.2 ish by 3mm sensor... so +/- 3um.

Yes i have m12 adjustable bolts in the feet.
10 deg of turning on the feet is clearly visible in the software.

About the units i am sure it is still on defaults so 1um, need to check.
Yes my measurements in the earlier post are off by factor 3.
Not yet that important since i was testing the setup and finding out the sop.

### about The laser.
The selflevelling seems to be spot on.
The optics are not.
I found out today.
Moving towards and from the laser the light is straight (light travels in a straight line) moving along the projected line gives false readings. +/- 60 um / 80 cm at about 3meters distance so only a few degrees

Now i know this, it is okay the way it is.
Just make sure you move in a straight line from and to the lightsource.

I have to put the laser a bit further away to get into the better sensitivity range of the camera. It all helps.

Actionplan:
* Input the correct units in the software
* Use a tripod laserplatform
* Put the tabel diagonals in plum.
* Check the 2 long axis.
* Check the short axis for horizontal variations.
* Check the short axis at lowest point and highest point to check top and bottom rail for allignment.

I have not thought of a way to check the spindle for misalignment by webcam/laser without trusting the optics.

But maybe a conventional plumbline and a light source (is that the right English word?) can do the job.


Grtz Bert.

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