Just wondering...

[[Ja...]]

At every place I've ever worked the machinists would clean their parts before bringing them to Quality to have them checked. Where I'm at now, that's not done. So for those of you reading this, do the machinists clean their parts before bringing them to you to be run on the CMM?

[[Da...]]

Yes ! They're clean or we send them back!

[[Ju...]]

Without a clean part, we can't expect clean data. As soon as that starts making the machinists' parts measure out of tolerance, they're suddenly more willing to clean their parts lol.

[[Pa...]]

this is an issue that occasionally happens where I'm at.

they're either spotless when they arrive or completely covered in coolant/chips/grease and there is no in-between it seems haha.

they get sent back if they're that dirty.

[[Cl...]]

You'd be amazed at the number of newer machine operators and inspectors that don't understand the importance of a clean
part for measurement. It's very frustrating when someone measures a part, it fails, and they call me to look at the program.
I can't tell you how many times I just cleaned the part, ran it again and guess what it's now in tolerance.

[[Ri...]]

I think I read on the old Zeiss forum a decade or so past.
Give me dirty parts and you will get dirty numbers.

Its held true since then.

[[Ke...]]

I've worked in small shops and I have worked at Ford... and "it depends"
Some places want their production to focus on production, and not to "waste time" cleaning up parts for quality inspectors.
I've never been one to be squeemish about getting my hands dirty, to ensure accurate measurements... but if it wastes a lot of time on my end (and I am the bottleneck), then I would push to have parts cleaned first... and that discussion would start with my manager/supervisor.

[[Ow...]]

Aside from if you don't have the time to do right, then you must have the time to re-do it.

Cost of measuring a dirty part:

When measurements are sub-optimal, cost overruns invariably follow (because incorrectly measured parts must either be discarded or re-manufactured) and for large-scale engineering projects, this can be a serious issue. Measurement errors can also lead to the purchase of incorrect amounts of material, sometimes delaying project progress. Additional costs can force a project to go over budget, a scenario that might have been avoided with better measurement tools.

There’s also something else. Next time you hear the words NASA, Hubble telescope, or Alaskan Airlines, you’ll probably think twice about them after reading this blog. That’s because measurement errors also lead to reputational damage when project and products fail due to inaccurate measuring tools being deployed. In a competitive economic landscape, that matters too.

Good read.
https://conoptica.com/2024/03/27/why-is ... -find-out/

[[Da...]]

Where I'm at, the parts are usually clean...occasionally I will have to wipe off a little bit of coolant but they are pretty good about cleaning off parts as soon as they come out of their machine whether they are coming to QA or getting packed to ship.