/r/Metrology
News and discussion related to the science of measurement and calibration.
We are also here to help a hand to any and all people looking for help with metrology, inspection and layout questions
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/r/Metrology
I am looking to find an easy way for operators to measure long shafts with runout, perpendicularity, ect on either end. All of the optical shaft measuring devices I have seen only have a max length of just over 1m. I see keyence has a portable laser cmm, will have to research that but figured I'd ask the community, thanks
Hello everyone!
Calypso users,
How would you measure the highest point on each blade?
The top of the blades is curved so I would use a curve function
Somehow I can't figure out how to evaluate it. The Z (height) of the maximum coordinate shows false data
I would appreciate some good advice
Trying to perform this verification from scratch and not really understanding the proper way to perform section 6.6 with the disc / circle.
Quiero crear un sistema de coordenadas en un programa de inspección de polyworks 2024, cuando introduzco las primitivas nominales aparece mi sistema. Hasta ahí todo bien pero no puedo hacer que los ejes queden orientados hacia donde yo quiero para que me coincidan con los de mi plano. Tengo la opción de girarlos pero al final al menos un eje me queda apuntando en sentido contrario al que quiero. ¿Cómo puedo hacer para yo definir la orientación de mis ejes?
Need one for a project of ours. Anyone looking to sell theirs?
Quick question: when reporting from a cmm, laser tracker, or whatever, what resolution do you report to?
I've always gone to the resolution of the machine, but others where I work insist on going to the resolution of the print. ie if the print calls for 5" +/-.1 and i measure 5.14, should I report 5.14 (.04 OOT) or shorten it to one decimal place, rounding to 5.1 (in tol)?
hello i am in a dire sutuation where i need an spc sofware for mesurement management, does anyone know of a cheap yet efective tool to do the task?
i need a graph for every feature with multiple parts in each graph
My main concern is the distance between the char 36 (Ø0.312 - Ø0.314) hole and the char 40 (Ø0.377 - Ø0.379) hole. This distance is not explicitly shown on the drawing, but it can be calculated in its basic form using char 49 and char 59 & 60, yielding 0.8133. My goal is to determine the smallest possible distance as a result of the FRTZF.
Since the FRTZF has a 0.007 diametrical tolerance zone and the distance between the holes in the Y-direction is not controlled by the FRTZF, only char 49 is directly affected by the 0.007 tolerance. In the worst-case scenario, the new distance between the holes would be: 0.8133 - 0.007 = 0.8063. Can someone confirm if my understanding is correct?
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(On a related note, I noticed some questionable aspects of this drawing. For example, is char 37 even valid? The PLTZF has a basic dimension for the Y-direction (char 59), but the X-direction is not defined using a basic dimension. Instead, it relies on dim Q, which has a tolerance relative to the edge (not a datum).
That said, I suppose it's still somewhat interpretable. Perhaps the intention was: "The hole location in the X-direction must first meet dim Q, and then its Y-location must conform to char 37." Essentially, this approach mixes hard dimensions with basic dimensions—though separately. Just not sure if its legal per Y14.5.)
Hi and thanks for reading. I know that TYP is no longer used and that the print should have x6 instead.
That being said, using the TYP, do I still measure all instances of the feature or just the one with the TYP callout associated with it?
Thanks for your time and insight.
Our 40ish year old CMM is on its last legs and we'll be looking for a replacement in the near future. It is used in our metrology lab for inspection of various automotive parts and tooling for the assembly of these parts. We are looking something dependable, easy to use and not going to break the bank. Any recommendations?
Edit: Recommendation on software also appreciated.
Does anybody have an example for a uncertainty budget for taper plug gauges please.
For me very easy operating & programming Aberlink CMM. i have solidwork & autocad skill.
is it possible to learn zeiss cmm within two weeks or one week ?
Machinist here... We've been having some issues with QC. We'll get good readings on the trimos, digital micrometers, CNC probes and optical comparator, and they'll turn around and reject us because their CMM says differently.
Recently, I got all 40 of my parts rejected while the trimos height gauge showed that all of my parts were good. I explained that you could check deltronicse pins and precision gauge blocks and be within a tenth every time, and they were telling me the part was .0004" larger than what the trimos was showing. So obviously something wasn't right. They didn't care. They were quite confident that the CMMs results are a superior form of measurement. I showed them that the mitotoyo digital micrometers showed the parts were good. I had mitotoyo precision gauge blocks with plain jaws attached as a no go and that the parts passed through. When I put the part on it's side and used a .0001 test dial indicator... I found that the biggest diameter part they accepted was larger than nearly all the parts they rejected for being too big. None of it mattered to them, because the Almighty CMM is most accurate and it's judgement is final.
I understand that a CMM, in theory, ought to provide the most accurate results. But it's quite obvious at this point that they're getting bad results.
The only explanation I can come up with is that they use tape to hold down just about everything, and I'm thinking that it's causing the parts to deflect. How would you go about diagnosing the issue?
We have a Romer 2.0 infinite and need to replace it (only because we cant find a new working computer with windows 7)
Thinking about looking into Keyence's wireless version. Thoughts? I know they like to call a lot.
For IATF, which type of MSA you perform in your machines (CNC CMM and CNC Microscope)?
We are looking to improve our inspection process, which generally includes 10-50 parts/steps per day. We currently use a combination of calipers, tape measures, protractors and gauges. Does it heavily rely on existing accurate solid models?
I'm pretty new to Polyworks and have a little query. When establishing a cartesian coordinate system to a primary datum plane and a perpendicular secondary datum cylinder (using a FARO arm), I noticed that the cylinder reports it's location in X and Y using UAME. It appears to be creating its origin at the point the cylinder axis intersects the primary plane. However, when reporting other features to the datum, it does, as would be expected, use RAME. I just found it a bit confusing as I like to double check my alignment and origin are correct as a bit of a sanity check.
Could someone please help me understand who their products compete against? It is my understanding they have four product categories: 1) arms/pcmm, 2) laser trackers, 3) terrestrial laser scanner, 4) mobile laser scanner.
I can’t figure out which of their products are good or bad. Would greatly appreciate your help.
Hey Guys,
I am getting an error "Probe reseated at the end of PROBE braking after 3 attempts". Machine is going for a touch but jerking back and forth. Happens intermittenly.
I have a HP-S-X1H_T
Any idea would be great. Thank you
Anybody have experience/recomendations regarding reusable desiccant packets for use inside cabinets that store Metrology high precision STEEL measuring tools. aproximate size should not exceed three inch square and must be of the type that is recycleable by placing in an oven overnight.