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Testing a scanning Module for damage

nooners4
Hi,

We are using scanning SM25-1 modules on our Global Adavantage 575 CMM's.

Are there any surefire methods for testing the modules to check to see if they are damaged.

Are there any tell tale signs that I can look out for that will help me identify a damaged scanning module?

Thanks!

Cian
  • I would say that if you are only seeing error in the scans but not other measurements then it's quite possibly a programming error or the settings are wrong. Could you post the settings you have for the SM25?

  • Our 1x50mm probe is showing a stddev of .0006 and can show up to 0.001 at times.
    Thanks!

    That's a bit high from my experience with these modules. However, a 50mm length is the max recommended length for that module. Do you get similar results with a shorter stylus?
  • If you are using carbon fiber anywhere in your stylus build you might be seeing the effects of micro-fractures in the carbon fiber.

    Usually if the SM module is going bad you see evidence of the sprung spring as previously mentioned and/or you fail the qualification routine.

    It sounds like you have mulitple modules machines & stylii, so check them against each other. Run part #1 on CMM #1 with SM 1 module #1 get results that show profile out - conflicting with other methods showing profile to be in. Next: Run part #1 on CMM #1 with SM 1 module #2 get results that show profile in - matching other method results = SM 1 # 1 is bad.

    Repeat: exchanging a single component at a time until you find the culprit. If you think a carbon fiber extension is suspect, do as above but change out the stylus rather than the SM 1.

    Basic methodical, scientific, approach to trouble shooting. May it serve you well.

    HTH

    I am not using any carbon fiber anywhere for my probe builds at the moment.

    Qualification of sphere is usually successfull. When I have seen the springs sprung the calibration routine doesn't even finish.

    I have 6 cmm's all with scanning modules.

    I will try the testing method you have mentioned to see if i can locate the culprit!

    Thanks!
  • Scan Settings



    Here are settings from one of the programmes that we run that we generally see issues with.

    All the settings attached are from the one program.

    Any insight into whether they are correct or not would be great!

    Thanks!
  • When you say your seeing errors on scans, are you using a cad model and did you check the surface vectors of the model.
    I've had problems with this before, especially with V2010 mr3 which I see you are using.
  • When you say your seeing errors on scans, are you using a cad model and did you check the surface vectors of the model.
    I've had problems with this before, especially with V2010 mr3 which I see you are using.

    yes we are using a CAD model and I am merely a tech trying to run the CMMs so cannot check the surface vectors of the model!

    We are running 2014 SP4 Release!

    Thanks!
  • So by saying you are a tech does this mean you don't have the ability to manipulate the programs being run? Are scans only OOT at certain parts of the scan? Perhaps at a curved surface or maybe a flat? If so and if you have the ability have you tried to take a single point at the affected area? Did it match the result of the scan? How tight of tolerances are we talking about and are you doing a form only or form and location? You also said these are known good parts - did these same parts originally check good via a scan or you hard checked them therefore know they are good?

    Sent from my SM-G900R4 using Tapatalk
  • So by saying you are a tech does this mean you don't have the ability to manipulate the programs being run? Are scans only OOT at certain parts of the scan? Perhaps at a curved surface or maybe a flat? If so and if you have the ability have you tried to take a single point at the affected area? Did it match the result of the scan? How tight of tolerances are we talking about and are you doing a form only or form and location? You also said these are known good parts - did these same parts originally check good via a scan or you hard checked them therefore know they are good?

    Sent from my SM-G900R4 using Tapatalk

    Exactly. I can try and ensure the hardware is running as well as it can but do not have the permissions to manipulate

    See the attachments for a scan on a CMM. This is the same part that failed but then passed.

    Thanks!
    Attached Files
  • This is the same part that failed but then passed.




    Was this part ran 2 times in a row? Is the part in a fixture?

    Just judging by the pictures you posted I would have to say there's an alignment issue
  • So I see a max force of .15 and a trigger of .2 in your second window of settings for analogue probing.

    The trigger force specifically should never be set higher than your max force.
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