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Z Axis Calibration for Disc Stylus

MatthewHaines
We have recently purchased a 6-way module and I want to experiment with a custom disc probe (bore too small for a star probe). Is it possible to measure undercut widths using a disc probe? (touch down, take a point, pull up, take a point, distance between them etc)

If so, how do you calibrate it in the Z axis so it calculates the maths correctly?

I received an email from Hexagon saying to try turning off probe compensation, doing the features, then add on the disc thickness to the distance result as an assignment. However, I haven't quite got the hang of doing assignments in all my youthfully ignorant glory, so can someone talk me through that?

Even if the undercut widths can't be measured, at least I can learn how to do the assignments (correctly) out of all of this.

We have PCDMIS 2013.

Our programmer left the company, and the 'people upstairs' decided to make me take over. Slight problem with this... I have zero engineering or even programming experience (which they knew). I actually started here as a labourer after Uni, so either this is one h*ll of a lucky break or a worst nightmare. So don't pull any punches, I need to learn and learn fast.
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  • We have recently purchased a 6-way module and I want to experiment with a custom disc probe (bore too small for a star probe). Is it possible to measure undercut widths using a disc probe? (touch down, take a point, pull up, take a point, distance between them etc)
    Nope, sorry.


    I received an email from Hexagon saying to try turning off probe compensation, doing the features, then add on the disc thickness to the distance result as an assignment. However, I haven't quite got the hang of doing assignments in all my youthfully ignorant glory, so can someone talk me through that?
    PM sent. Also, investigate Metrology Putty. The CMM isn't the only way to measure stuff and sometimes not the best.


    Our programmer left the company, and the 'people upstairs' decided to make me take over. Slight problem with this... I have zero engineering or even programming experience (which they knew). I actually started here as a labourer after Uni, so either this is one h*ll of a lucky break or a worst nightmare. So don't pull any punches, I need to learn and learn fast.
    Welcome to CMM world! This is how most of us start. I'm not a real engineer either, but thanks to many years at The School of Hard Knocks I am nearly a competent CMM-er.

    You need these three basic skills:
    1) Spatial Relations - think in 3D.
    2) Desktop computer operation - files, folders, saving, backups, and garbage-in-garbage-out.
    3) Problem Solving - because all we do all day is 3D computerized problems!

    If you are weak in any of the three, practice and good attitude will allow you to grow in strength.

    We have also found that near-paranoid levels of OCD and attention-to-detail are beneficial.

    First and foremost, GET TO TRAINING. You need at least Level 1 class from Hexagon. I teach these classes, and the difference between people on Monday and on Friday is huge.

    Good luck!
Reply
  • We have recently purchased a 6-way module and I want to experiment with a custom disc probe (bore too small for a star probe). Is it possible to measure undercut widths using a disc probe? (touch down, take a point, pull up, take a point, distance between them etc)
    Nope, sorry.


    I received an email from Hexagon saying to try turning off probe compensation, doing the features, then add on the disc thickness to the distance result as an assignment. However, I haven't quite got the hang of doing assignments in all my youthfully ignorant glory, so can someone talk me through that?
    PM sent. Also, investigate Metrology Putty. The CMM isn't the only way to measure stuff and sometimes not the best.


    Our programmer left the company, and the 'people upstairs' decided to make me take over. Slight problem with this... I have zero engineering or even programming experience (which they knew). I actually started here as a labourer after Uni, so either this is one h*ll of a lucky break or a worst nightmare. So don't pull any punches, I need to learn and learn fast.
    Welcome to CMM world! This is how most of us start. I'm not a real engineer either, but thanks to many years at The School of Hard Knocks I am nearly a competent CMM-er.

    You need these three basic skills:
    1) Spatial Relations - think in 3D.
    2) Desktop computer operation - files, folders, saving, backups, and garbage-in-garbage-out.
    3) Problem Solving - because all we do all day is 3D computerized problems!

    If you are weak in any of the three, practice and good attitude will allow you to grow in strength.

    We have also found that near-paranoid levels of OCD and attention-to-detail are beneficial.

    First and foremost, GET TO TRAINING. You need at least Level 1 class from Hexagon. I teach these classes, and the difference between people on Monday and on Friday is huge.

    Good luck!
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