Quality Engineer making about 70k. Opportunity is available but wondering if its worth the added responsibilities.

Setting up the temp sensors for my zeiss. Tryed Googleing this and I keep getting different answers, cant seem to find a solid number, the only one that seems to be close to what im looking for is 4 -8 and I have no idea what the hell that means.

Hi I am being asked to review calibration information of a refrigerator by a third party and I'm looking for some explanations on how to interpret a certificate.

The certificate lists a Nominal Value (5.0C Celsius), and a Test Value (7.0C Celsius) with a tolerance of +/-1.0C.

Which value would be what the calibration standard displayed and which would be what the refrigerator displayed? I am trying to assess if refrigerator was artificially reading higher or lower than the calibration standard.

Hey there, I do field calibrations for my company out in eastern pa and the other guy i work with who did all of our surface plates in the field, left abruptly, and they are now falling onto me, I guess im posting here to see if anyone knows of any classes to teach the re-surfacing of granite surface plates (preferably in person)

Hi, been a long time lurker been following threads online. We are in the avenue of purchasing a new cmm for a contract we secured for oil and gas. Mostly all the parts are cylinder format and some with decent freeform complex geometry external. Taking a look at the parts and the contract. It calls out high form density data in pockets on the interior and exterior. Parts range in volume, a 1.5m machine in Y would be sufficient, X is around 200mm-425mm diameter.

We have a couple cmm’s in house already, but capacity and capability are not. Currently a couple touch probe tesa’s heads and one scanning system, but the envelope is a little small to get to all the features without multiple ops and stitching data. Management has asked to look for a dedicated machine for the contract. We are not tied to one brand or software, just looking at possible options to the job efficiency.

Opinions and recommendations?

Edit: we will require to get GR&R’s and capability data set in stone before. Parts are coming off GROBs and Heller machines.

Hello everyone,

Long time lurker, first time poster here. I have a question about accuracy with the Romer arm and pcdmis. Here's the setup:

- Largish part that requires the part to be flipped and scanned a second time to get it in it's entirety.

- The arm is securely bolted to the granite.

We tend to create two COPS, mesh them to each other and then mesh to the CAD, followed by a colormap. My question is: are we losing any accuracy with the two meshed COPS? Would it be more accurate to create one COP, mesh it to the CAD and do a color map and then do that again with the second COP? We're kinda in the dark for now until we get some proper training in June.

Thanks in advance for your help!

I’m pretty new to mcosmos and metrology in general, I have a cad model of an automotive part and PMI information of abc and def nominal positions, DEF dosnt sit along the cad car line coord system.

I’ve been able to use RPS alignment to get the def positions but I’m having difficulty aligning the part to get an abc alignment so I can tolerance Datum D which is a plane and datum E and F which are holes.

I’ve set the relation to cad coord system and I’ve moved the cmm coord system so the features are offset by there nominal positions( origin shift back to car line origin).

When I then take surface points on the part where ABC features should be they are not outputting the correct position or even close, when I try to run an RPS subprogram using Abc points I’m not able to select the correct nominals for ABC(I’m assuming because they are not achievable) so it will fill XYZ with nearest values.

Further information, I’m using a feature that’s sitting parallel to the cad coord systems XYZ for my origin this is not a DATUM DEF, I then lock down 6 degrees of freedom and do an origin shift back to car line 0.

More further information, when I take a base plane alignment on my machine alignment feature it tilts the view of the cad model when looking at a default plane view, originally it sits flat by the base alignment changes.

Can anyone help me with this?

I assume there is a slight rotation in my machine alignment throwing off the part slightly. Maybe due to the feature not being the DEF. I have tried that too but the alignment is worse.

Hi, in PC-DMIS I accidentally somehow hide option to save id name in automatic element. So when I name hole for example “M8_1” program should ask me if I want to remember that, so next hole will be named “M8_2” but it didn’t.

Do anyone know how to renew this function? Thank you!

I'm looking to start adding pass/fail inspections for note requirements (ie remove all burrs/sharp edges) in my inspection programs. How would I go about doing this?

The shop I have been working at bought a Hexagon 4.5.4 shop machine about a year ago, we just had Hexagon come and re-cert the machine since it was due. They were in and out in a day, as they only ran the B89. My boss was too cheap for the 10360, which at my old job is the only thing I would consider if I owned a shop.

I have always questioned this machine and its specifications, specifically the temperature range (20-50c) 2c an hour or 10c per day.

I have seen it to be steady in the +-7um range at around 20-21c. Once lunch hits, temperature rises steady about 2c an hour to about 28-30c. I can’t really trust anything on the machine till the temp comes down the next morning. It won’t pass my in house calibration test, I run on a calibrated artifact.

My +-7um jumps, on the lower end to 9um on a good day. I then have to add the 3um repeatability spec. and calculate the material coefficient of expansion. We mostly run aluminum parts in the 300mm range. This can get my uncertainty to ballpark range of 18um. Anyone have a similar experience with these machine being absolute garbage?

Hey everyone,

I'm facing an issue with calibrating the load cell on a silo that holds 70 tons of material. Unfortunately, I don't have access to test weights for calibration. I'm wondering if there's an alternative method or procedure that could be used.

Has anyone tried supplying electrical voltage or current directly to the load cell for calibration purposes?

Any suggestions, advice, or links to resources would be greatly appreciated. Thanks!

I just started using a Romer Arm a few hours ago and now I'm left alone (3rd shift life). I have a green blinking light on the back and when I try to activate the scanner trigger, it doesn't do anything. I'm running PCDMIS 2021.1. Anyone know what I've done?

Does nist mention anything about using direct readings for class 6, 7 or f instead of double substitution.

Hello there, new to this subreddit but I am at a loss with this damned machine. I have been trying to get it to run for 2 days now and before I call I want to see if anyone else has had this error and fixed it.

The error is when I am starting PCDMIS for the start of the day, I turn on the control box and controller, start the program and go to calibrate. The wrist disconnects, then reconnects, then gives me this error. Doesn't matter the angle, it just does it. Has anyone dealt with this kind of error before?

Equipment: PCDMIS 2023, Brown & Sharp Excel Bridge CMM,

I'm encountering an issue with my Aberlink Axiom Too HS CMM where it shakes noticeably when moving along the Y axis. The X and Z axis movements seem unaffected.

Any insights into potential causes of this issue, or how I can troubleshoot?

Any help or advice would be greatly appreciated!

Hello guys, that "nice" software of Mitutoyo still wonders me how "user frendly" it is. A month ago we had difficulties creating datums, that difficulties had gone to the point that we cannot set tolerance according to the given drawing. Now we have request to measure part with composite datum... again not knowing how to achive it.

So I want to ask if someone have experience working with modifiers in second and third datum:

​

case 1

At "Case 1" A is a plane, B and C are cylinders. The true position of each of the 5 holes can take bonus tolerance from MMC of B and MMC of C. We cannot find a way to set it - it's either B or C.

position of circle

​

What's worst is that last week we got request for measuring part with some composite datum ref

​

​

case 2

where we dont have the slightest idea how to create such "datum calculation".

Updated: check comments for my update. As I progress I’ll update more for anyone else that might encounter this issue… there currently is so little MCosmos/MiCAT discussion happening online so resources are few and far between.

Hoping someone here can enlighten me a little either through comments or in DMs.

Background info: part model came through it uses 63 4-40 bores all with .005 positional to various datums related to specific clusters. My only relevant probe set up 1mm/10mm ruby that I would sub for a longer 1mm cyl probe in editor. The model DOES NOT have threads. So it’s just a .089 bore on the model.

For some reason I cannot get the 1mm ruby to probe any of these bores. It tells me I have no available tools to use, and highlights my edge offset. Manually selected my 1mm and reduced edge offset as I have many times before with no outcome this time.

For reference, I know this is possible and shouldn’t be an after point deflection issue bc I’ve programmed a previous rev of this part through MCosmos with my 1mm cyl probe and we’ve ran that for a long time without issue.

I can provide pics in DM if anyone needs anymore context or visuals. Mitutoyo applications engineer has been 0 help so far, it seems they don’t even know the software.

I am a mechanical engineer at a machine shop. I’ve had multiple conversations with my boss and our inspect lead about our acceptance sampling plans. (We sort by attribute and just use the AQL tables in ANSI/ASQ Z1.4). They insist on several absurdities:

1. Using the AQL tables is statistical process control (as opposed to statistical quality control), and we can’t use them if our process is out of control.

2. If a batch passes the AQL then all the parts are good. If any of the parts are bad then the AQL failed.

3. The AQL tables are based on the normal distribution with standard deviations and stuff.

4. We can’t pick different columns on the table based on our needs because the AQL table decides what values we use, not any one person. (Yes, our quality lead said this)

My boss implemented the system we have before I got there. I’ve attempted to correct these assumptions several times and have been laughed at. What on earth do I do? As far as I know, my boss pulled some tables off a website (without realizing where they came from) and told inspect to use the columns he picked out. He has no clue what any of it means and is making decisions based off it. What do I do? Does anyone know a good source besides the standards themselves? Something a little less overwhelming that they might be willing to look at. And does anyone have a good source for the math? I’ve worked through it before but can’t seem the find the research sources I used.

At our manufacturing facility (OTC/pharma) operations perform a daily verification with tolerances equal to our adjustment limits on scales and some other instruments.

We have new equipment coming in that is loss in weight feeders that have hoppers on top.

We're trying to determine the best way to perform this function without emptying the hopper and to account for any mechanical resistance (hysteresis).

We've brainstormed and I think we've come to a good solution of doing it at the end of the day when they hopper is at it's lowest using that reading at a 'tare' and adding a value in the middle of the range. In this case it would be 40kg, from there determining if the change of 40kg is within our 0.5% tolerances.

I'm coming here to see if any of you have something similar for loss in weight feeders/batching system.

I have a copy of the second edition. Are there enough changes or updates to the third edition to justify paying $150 for it?

I want to create a stored "home" position in my programs. Is there a way to store a position as a named variable that can be called up at any point in a program to sent the probe back to said position. I want to be able to do this on a per-routine basis, so a global home won't work for this.

I'm thinking along the lines of the way Position Registers work in Fanuc robots. Is there a way to do something similar in PC DMIS.

To be clear, I know I can store individual xyz locations as variables and call up a movepoint to send the probe to (v1,v2,v3), for example, but is there a way to create an xyz location, call it "A" and then simply type a command to send my probe to "A" wherever in the routine that I may need?