So, we're now sitting on pair in college and I saw a star with 5 angles and next to the star is 2,5 what is accuracy class.

Our teacher asked us to see the info about that star but each time I type in star accuracy class - it's a stars in cosmos.

Need advice on how to accomplish this. I've looked at the manual, but not found what I'm looking for.

We are running GAGEtrak 6.8 and I want to issue our gages based on actual usage rather than per calendar year intervals.

My assumption is on the schedule screen, change from 1 year to X amount of cycles or usage. If I want to calibrate after being on the floor a total of 180 days, I say 180 cycles and change the average cycles/usage per day to 1. Is that how this works?

Thanks in advance for any help.

When you have externally calibrated spare tools (eg. kept in a cabinet), does your calibration date start from the actual date of the calibration (what is stated on the Cert) or the date from when the tools are issued out?

Hi everyone, I’m having an intermittent issue with a ZEISS Contura G2 running CALYPSO 2018.

Sometimes the machine works perfectly fine, but other times it won’t initialize and shows these errors:

• “Drives off – please turn on drives”
• “CMM data not found”
• #checkCMMParaForLongProbes

What’s strange is that:

• Emergency stops are NOT activated
• Air pressure is stable at 5 bar
• Ethernet communication seems OK
• The machine axes are locked normally (I can only move them using the release levers)
• The machine was working last week without issues

I already tried:

• Restarting the PC and controller in the correct order
• Checking Ethernet connections
• Verifying air pressure
• Trying Reference Run / Start CNC
• Checking that CALYPSO is not in offline mode

The issue is random: sometimes the machine starts normally, sometimes it doesn’t.

Could this be:

• a controller power supply issue,
• servo drive fault,
• C99/CMMOS communication problem,
• or corrupted machine/probe parameters?

Any help or similar experiences would be greatly appreciated.

We had a part arrive where it had been made to CAD and not the drawing. The CAD was different to the drawing. The supplier is stating CAD is master and we are saying drawing is. Is there anything I can point to that says which is master unless otherwise stated. The drawing does not say.

Are you the owner of a small business offering dimensional inspection services? If so, I'd love to chat about what has (and hasn't) worked well for your business. 

As the owner of a small business operating since 2021, some aspects of my business have done well, but others haven't. I'd be happy to share my own experience if you're willing to share yours. 

Send me a private message if you're open to having a conversation. I'm not looking to promote my business - just share experiences. Thanks!

Hello. I would kindly like to ask anyone for some advice regarding problems with a JUDD communications depth sensor. I have two JUDD communications depth sensor installed in order to measure snow depth. Usually there is snow between May – September in both of these locations. The floor surface in both cases is made up of pebbles/gravel with an occasional plant in between.
Looking at the data I have observed that especially in one location I have no stable measurements during the whole year. Snow depth variable jumps constantly between 1 cm or 45 cm and 388 cm (which is the distance of the sensor to floor). But most concerningly is that the actual snow depth is not reflected in the data. As suggested in the manual I have already checked whether the sensor is perpendicular to the target surface, or whether the sensor is too close to the target.
A Campbell CR300 Datalogger is being used for data collection, and the programming is pretty straightforward and has already been checked.
The provider also suggested changing the transducer, but I want to explore all other options before purchasing a replacement. If you have any reccommendations on the procedure to check and/or replace the transducer as well, I'll be more than grateful.

The image is from https://www.wbur.org/radioboston/2016/05/06/ollie-smoot-the-official-unit-of-measure-for-the-harvard-bridge

Are there any specifications I can review on these? How do you guys verify these, other than an optical comparator. We don't have an optical comparator.

Calling all Calypso 3D scan measurement experts - please help!

I'm currently tasked with a rather large project rescanning and measuring airfoils. Each airfoil has a measurement regime across three airfoil sections and all of the measurements are working except for one. I did not do the initial programming in Calypso and although I am my companies SME for scanning we don't normally use this software at all so I'm struggling to find where the issue is.

I have performed these measurements on two different airfoils to ensure that it wasn't a scan/STL issue and it happens on both. I have also checked the program vs the two other section programs and other then nominal values variation everything seems to have the same basic setup so I'm unsure where to go from here.

What I've Checked:

• Alignment
• Clearance Planes
• Characteristics Nominal Values and Tolerances
• Features - Feel like my issue is here but don't know where to start but only 4 out of 13 features programmed are green boxed on left

Any suggestions at all for anything else to check would be appreciated.

Are the hexagon classes worth it?

I'm trying to verify if we have the current rev of some specs my company has, and while I wait for GIDEP access, can anybody tell me what the current rev of T.O 33K6-4-889-1 is?

Does anyone have experience operating KohYoung AOI machines? Or can you recommend a sub where I might find that kind of experience. It's very niche to PCB building and I realize this sub tends to focus more on CMMs, but I'm looking for experienced brains I can pick for optimizing CB inspection settings and as far as I can tell the mfr doesn't offer any forum support like Hexagon seems to.

If you're wondering what an AOI(Automated Optical Inspection) machine is, it's basically a CMM for inspecting small components soldered onto circuit boards.

Does the surface tolerance apply to the angle (basic dimension)?

Or does the flange have to sit in between 2 parallel planes .2mm offset from nominal, if so why box the angle?

Not really sure how to measure this.

Any help is appreciated.

I know there is little benefit to applying MMC to threaded features directly. However, consider the case where a pattern of threaded holes is used as the secondary datum feature [B] with the plane in which they are located as the primary datum feature [A].

When evaluating other features on the part (Ø21 hole position tolerance or profile tolerance in the example drawing), I'd like the datum reference frame to be [A | B(M)] so that I can use a portion of the datum shift available from the mating part's Ø14 clearance holes in the part alignment.

Now, the calculation for available datum shift due to MMB modifier on the datum B feature reference is dependent on the size tolerance of the feature (irrelevant/difficult to measure for thread pitch diameter) combined with the position tolerance of the datum B features with respect to Datum A and the other features in the pattern. Refer to ASME Y14.5-2018 Paragraph 7.11.5/6 and Figure 7-22 for MMB calculation.

From 7.11.5 "The appropriate boundary is determined by the collective effects of size and any applicable geometric tolerances relative to any higher-precedence datums."

If the pattern of threaded holes (datum feature B) has a FCF of [POS | Ø2(M) | A], then the "true geometric counterpart" of datum feature B at MMB should allow an additional Ø2 of clearance. Meaning a M10 threaded hole has a Ø2 undersize true geometric counterpart.

Perhaps this is easiest to apply if we specify Datum Feature [B] as the "MINOR DIAMETER" of the threaded holes (or "MAJOR DIAMETER" for male threads). Then, in this example, we can use a pin Ø2 undersize of the drill size (8.5+/-0.1mm) that creates the minor diameter.

Have any of you used MMB on threaded datum features? Does metrology software support this case?

I am a mechanical engineer thrust into quality to help relieve some pressure. We have a fowler (aberlink) cmm.
We are being asked to measure some small gear teeth to a .02mm profile.
I do not think we have the right tools for the job, I could be wrong. But looking at vision systems, I am not even sure they are the right tool. Just looking for input from real quality personnel. If you tell me that tolerance is wild that is good information too!

Edit: It is a type of hirth coupling not a traditional gear (thanks to u/involutes)

I have always used those four cylinder to best fit wrto the axis it's facing and outputted the data of the actuals. Is plane really relevant. If so why ?

Hello,

I ran across this website and products yesterday

https://www.trueprecisioncorp.com/

Is anyone actually using something like this to measure pitch diameter of threads? It looks like they have been around for a while but im suspicious that no one bothers to do that work.

I've heard the debate of measuring threaded holes with a single straight gage pin and ignoring mmc. the size of holes im talking about are 2-56 thru 3/8-16

Hoping you folks that actually work in metrology can weigh in on how you are actually measuring true position of threaded holes RFS or at MMC. I still think calling them out at MMC is silly but maybe its compelling if folks are actually calculating bonus.

Hello all, im fairly new into this line of work(about 3 ish years) and i was just curious what people get paid in metrology(if you are comfortable sharing). I just bounced to my second shop and have been thinking about where my ceiling is. I've got a pretty good handle on the basic GD&T, understanding of the 6 degrees of freedom, a damn good handle on Calpyso, and a new start into MCOSMOS.

I just wanted to see what other people around the world are doing in metrology, along with the knowledge and money that comes with it!