hexagon logo
Register Sign in
  • Replies 22 replies
  • Subscribers 223 subscribers
  • Views 373 views
  • Users 0 members are here
Options
Related

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
  • 1) They are not of the most robust, I have sent a few to the grave.
    2) I have a calibrated ring gage and a artifact (with circles, planes, spheres, cylinders....) that I will run periodically or when I suspect odd behavior, like damage or questioning engineers....
    3) Is there any visible sign of damage and has there been any known oopsies?

    Just my experiences and .02¢
  • 1) They are not of the most robust, I have sent a few to the grave.
    2) I have a calibrated ring gage and a artifact (with circles, planes, spheres, cylinders....) that I will run periodically or when I suspect odd behavior, like damage or questioning engineers....
    3) Is there any visible sign of damage and has there been any known oopsies?

    Just my experiences and .02¢

    We run a ring gauge programme also. Should I be running it at the angles we scan at or is A0B0 sufficient?

    If you dont mind me asking, what would a damaged module's result look like?

    Thanks!
  • I have a few questions for you. What's happening that you would suspect the module of being damaged? Are you seeing poor calibration results? Are you seeing bad part results? Bad scan results?

    When I was using an SM25 I typically knew it was damaged because the spring was sprung. There is a lot of fragile intricate pieces inside of the SM25 doesn't take much to wreck them. If I remember correctly you are looking at about $2500 for a refurb....
  • I have a few questions for you. What's happening that you would suspect the module of being damaged? Are you seeing poor calibration results? Are you seeing bad part results? Bad scan results?

    When I was using an SM25 I typically knew it was damaged because the spring was sprung. There is a lot of fragile intricate pieces inside of the SM25 doesn't take much to wreck them. If I remember correctly you are looking at about $2500 for a refurb....

    Generally we are seeing out of tolerances on scans of parts that we know are good parts. I'd also be worried that it may not be the module and we are getting rid of modules that arent in fact bad.

    Also, I wasn't aware that they can be refurbished.... is there somewhere in particular that does this?

    Thanks!
  • When I was using an SM25 I typically knew it was damaged because the spring was sprung. There is a lot of fragile intricate pieces inside of the SM25 doesn't take much to wreck them. If I remember correctly you are looking at about $2500 for a refurb....

    +1 YGOLORTEM. I go through Renishaw directly, but check around for other dealers. I will use a square or 123 block and bring the probe down to it and move the square around the circumference of the probe to see if it is off kilter to one side or not. Easy way of checking if the "spring was sprung".
  • +1 YGOLORTEM. I go through Renishaw directly, but check around for other dealers. I will use a square or 123 block and bring the probe down to it and move the square around the circumference of the probe to see if it is off kilter to one side or not. Easy way of checking if the "spring was sprung".

    Great thanks for your advice. Is it worth running a scanning test at different angles or should a test at A0B0 show up any module issues that may be happening?

    Thanks!
  • A0B0 should show if there is any mechanical issues. Have you calibrated and checked the results?
  • A0B0 should show if there is any mechanical issues. Have you calibrated and checked the results?

    When we calibrate the results show up ok. When we run parts the profiles of parts when scans are being taken are reading out.

    On saying that, for scanning module calibration results, what would be a result that would show a damaged module?

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

    Any info would be great!

    Thanks!
  • Whenever I would run a part and the CMM (NOT an SM25) said it was bad, my boss would always ask me if I was sure that the CMM wasn't eff-ed up, to which I would always ask if he was sure that the parts weren't eff-ed up. Frankly, both are valid points. You say that you know the parts are good. How do you know that? Is the module giving you any evidence that it is eff-ed up?
  • Generally we are seeing out of tolerances on scans of parts that we know are good parts. I'd also be worried that it may not be the module and we are getting rid of modules that arent in fact bad.

    Also, I wasn't aware that they can be refurbished.... is there somewhere in particular that does this?

    Thanks!

    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


© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement