Touch probe for 3D scanning

touch probe

Graham calls this touch probe his first useful milling project. He had already built the CNC mill and once he built this probe on the mill he essentially had a 3D scanner. The central hub is supported by three shafts spaced evenly around its axis. These shafts each rest on a pair of ball bearings to make a complete circuit. If the probe bumps into anything, one of the shafts will lift, breaking the circuit. TurboCNC has a built in routine for scanning with a touch probe. The program generates a point file which Graham pulled into Rhino for modeling. His example application was cloning a model airplane prop that had gone out of production. The TurboCNC routine isn’t very quick since the probe always returns to the same height so he’s coding a faster algorithm. This type of touch based scanning was also employed in agiecco’s LEGO 3D scanner.

Comments

  1. kURTROEDEGER says:

    I like this, I’ll be interested in his quicker program.

    –KurtRoedeger

  2. shameek says:

    its essentially spare parts for a 3d scanner…the probe he milled is the same thing that comes with the scanner that I use

  3. rodrigo says:

    meh. it’s gonna be hard to top the previous post.

  4. Greg says:

    2. WOW thanks for that awesome comment shamu.

    I guess we just make a summerized guess of what we think the article is about and make that a comment?

  5. tuckie says:

    That comment was just as constructive^

    Personally, I think this a great idea, and I’m amazed with how accurate it can be. Now the real trick here will be devising a way to rotate the probe so you can scan all faces of an object into the computer.

  6. Greg says:

    he started it.

  7. jfh says:

    Ha!

    That’s cool! I’m surprised at the resolution too, for some reason I’d have guessed a pretty low one. I can see why that would take a long time.

  8. mark says:

    Why not use EMC (linuxcnc.org) instead of turbocnc?

  9. EMC (linux.org) is most powerful!

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