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  • Author Author: ralphjy
  • Date Created: Date Created
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TOF Sensor mounted on Laser

ralphjy
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The next step in my project is to print a mounting fixture for the micro-LIDAR TOF sensor.  I wanted to position the sensor lens in approximately the same plane as the laser lens.  Any small discrepancies will be corrected when I calibrate the offset.

 

The shroud has a press fix onto the spindle/laser mount.  The lower shelf holds the VL6180X and I picked standoffs of the appropriate length to adjust the sensor lens position.

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Bottom view (the addition hole position allows me to mount the VL53L0X).

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While I am prototyping I am just going to mount the solderless breadboard into the upper cavity.  This allows me to continue using the USB programmer.

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The assembly with sensor connections.

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Mounted on the spindle/laser holder.

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When I am done testing I will remove the USB programmer and mount the MicroView in a socket on a small proto PCB.  I'll wire the power and ground from the GRBL controller.  I also need to add the wire to the z-limit input of the GRBL controller.

 

The next step is to do the performance testing with the VL6180X using the averaging program.  I decided to combine a few of the steps from the previous blog and just do all the integration/testing on the cnc/laser machine as I'll need to get wired to the GRBL controller and it's probably better to do the testing in the use environment.

  • in reply to dubbie

    This method doesn't have the accuracy/repeatability required for 3D printing or CNC.  I find that I adjust my bed infrequently when 3D printing and for CNC the tool variations require me to manually adjust.  The laser is a lot more forgiving in focus tolerance and I need to refocus frequently whenever I change material thickness (anywhere from thin cardstock up to about 1/2").  So I'm hoping that this will work for the laser.

     

    Ralph

  • It would seem to be a good idea to do the calibration testing on the real CNC/Laser hardware to get the most accurate environmental conditions. It will be interesting to see if the 3D printed part has any shrinkage/expansion effect over time which affects calibration over time. I use aBS which I think absorbs water over time so I assume that ABS will expand gradually.

     

    Dubbie

  • Good update.

     

    It will be interesting how stable it is.

     

    Have you considered using it to test reposition accuracy?

     

     

    DAB