Dimensional tolerence: ±0.10mm Tool varience: ±0.28

[krispos42]

:banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead:


Anybody else see the problem here???


This was my night at work. Entrenched stupidity in action. Scrap, scrap, scrap, scrap, scrap...


Anybody else's Monday suck like a black hole?

[LeftyFingerPop]

1. Well;.I really don't know...

But I am assuming that the dimensional tolerance should not be more than the tool variance?

[krispos42]

3. Or if tool varience is less than dimensional tolerance, that would be great too

And we used to have the proper drill bit that waa nice and stiff and didn't "wander" when it drilled. And we got over 1,200 uses per bit!

But they were "too expensive", so we went with cheaper ones that don't have the super-thick shaft the old ones did.

So they drift when the drill, resulting in about 1 in six parts being scrapped. And they only last about 150 parts before they get dull and drift even more.

BUT WE'RE SAVING MONEY!!!

<sigh>

The dimension is 68.7mm ±0.10mm. You can sneak it up to 68.84 or so and it will still fit the test fixture.

I got measurements ranging from 68.44mm to 69.00mm!


And I can't even complain to my boss, because he's been complaining to HIS boss and getting nowhere, so he's just as fustrated as I am!

[OmahaBlueDog]

6. Whatcha makin' with those stringent dimensions?

Shafting? Mold making? Hydraulic fittings?

[krispos42]

9. Stainless-steel domestic kitchen faucet housings

Upscale ones.

The machine will hold that tolerence no problem. But the damn drill bit won't!

:mad:

[Dogtown]

7. Pennywise

...

:eyes:

[mcctatas]

2. Oh I see the problem...

you work with numbers all freaking day;)

[krispos42]

4. Not even that, usually

Just a quality-control check at the beginning at the shift and one after lunch. But now it's measure 100% of that troublesome dimension and now the extent of the problem is apparant. Lord knows what will actually be done about it, if anything.

[Oeditpus Rex]

5. I'm reminded of a poem my college drafting instructor passed around

called "The Crafty Draftsman."

I can remember some of it:


The designer sat at his drawing board

A wealth of knowledge in his head was stored

Like, "What can be done with a vertical mill?

or a turret lathe or a radial drill?"

...

"Brass would work for this little gear,

but it's too damned easy to work, I fear.

So I'll put a compound taper there

and a couple of angles to make 'em swear."

...

And finally, he shouted "Success at last!

This damned thing can't even be cast!"



:D

[krispos42]

10. LOL

No, we aren't that bad. We just have to buy THE RIGHT DAMN DRILL BITS!!!

[DS1]

8. off

I can see how that would be maddening.

I also work in a pennywise operation, damn FOOLS!

[IndianaJones]

11. man...to have such large tolerance. My dream. nt.

[hunter]

12. They'll change the tolerence...

Push the problem downstream until customers start returning truckloads of defective products, and then, the inevitable class action lawsuits will follow when people's houses get flooded, they slip on wet floors and crack their heads open, etc., etc.

Isn't that how U.S. business is supposed to work?

[pdx_prog]

13. Come on over here.....

We work in tenths.....all carbide tooling

[Ptah]

14. .0001 mm?

:wow:

[cloudbase]

15. The eternal battle

between engineers and "management" continues.