Making a pringle flat

[Bented]

16" diameter X 1 " thick stainless burnout that finishes at 1" thick per the drawing.

I will be fortunate if I can finish it at .900" thick, it has distinct distortions 180 degrees apart as seen here. The backside is finished at .950" thick.
It is a mess.

[Doc Nickel]

Burnout? I'd like to see the plasma cutter- or laser- that can cut an inch of stainless.

(Not saying it can't be done, I'm just saying it must be huge. )

Would it have been worthwhile to tr and press it flat(er) before starting cutting? Or would that be inducing the wrong kinds of stresses? Then again, if the curvature was caused in whole or in part by the cutting, is there a risk of it re-warping as you turn some away?

Doc.

[RB211]

Aren't you supposed to start with stock thicker than finished size?

[Bented]

Aren't you supposed to start with stock thicker than finished size?

Only if your employer buys such material otherwise all bets are off.
When I pointed out to him that there is no way the part will finish at 1 inch thick he said do it anyway, so I did.

The material was 1.005-1.020" thick from the mill, this is not enough to even clear the mill surface off and maintain the desired dimension.

I do not purchase the material.

[gellfex]

When I pointed out to him that there is no way the part will finish at 1 inch thick he said do it anyway, so I did..

And that's why I've worked for myself for over 35 years. It's medical thing, my eyes do an uncontrollable roll when people say things like that to me.

[A.K. Boomer]

Can you paint it with something really thick like roofing caulk - let it dry enough to finish it and then put it on the bosses desk?

[Lew Hartswick]

That is SOME POTATO CHIP.!!
...lew...

[reggie_obe]

RTS: Rates the Same. I get paid just as much to waste my time with this material as I will when better (thicker and flater) material is purchased as a replacement.
Please let me know when you will discard the original parts in the scrap dumpster so I can retrieve them.

[Bented]

As a side note the Noga indicator holders are generally excellent aside from the end fittings which are awful.

[A.K. Boomer]

You sure you don't just have that upper and lower clamp of the 4 jaw too tight and left the two others loose?

(knuck knuck knuck)

[tom_d]

RTS: Rates the Same. I get paid just as much to waste my time with this material as I will when better (thicker and flater) material is purchased as a replacement.
Please let me know when you will discard the original parts in the scrap dumpster so I can retrieve them.

Yep...the meter is running no matter what's mounted in the machine. Problem I always had was lack of the much needed I told you so clause in the rate schedule. Somehow it always wound up being my fault when things go tits up. That, and lack of an asbestos blanket to protect from the inevitable firestorm from the customer 'cause they're never told this thing won't work until after it's way too late.

[mochinist]

Only if your employer buys such material otherwise all bets are off.
When I pointed out to him that there is no way the part will finish at 1 inch thick he said do it anyway, so I did.

The material was 1.005-1.020" thick from the mill, this is not enough to even clear the mill surface off and maintain the desired dimension.

I do not purchase the material.

Was your boss ever a machinist or does he just own a shop? Im the owner/quoter/material purchaser/and a bunch of other hats at my shop, but wasn't always. I cant imagine anyone with any machining experience, especially someone that owns machines big enough to even quote something like this, not knowing that this part would never finish at 1.00” when ordering 1” plate. I dont have the specs in front of me but if I remember right, flatness tolerance for 1” stainless 300 series is something like a max of .25” at 36”, although it is rarely that bad.

[Toolguy]

I can't count the number of times I've told a boss "This won't work", and they say "Do it like I said". Then after it doesn't work, they want me to fix it, by reworking the steaming pile of junk, instead of starting over and doing it right to begin with. Downhill from there.

[J Tiers]

In my case, the boss in question was addicted to saying "you don't KNOW there will be a problem"..... Well, in many cases, yes, I DID know there would be a problem. In others, I "suspected" (strongly) that there would be a problem.

And, the problems often duly appeared in the warranty claims.

One very low cost guitar amplifier we made (in the US at the time) he wanted to get the component count as low as possible. A worthy goal, by the way.

But the resistor he wanted to remove was an input resistor in series with the input jack. We always put that in to avoid uncontrolled currents due to static electricity discharging into the input.

Well, he said "you don't KNOW that" and refused to allow the part. So, we had seasonal increases of warranty claims during the times when static was prevalent (usually winter, but sometimes during the summer A/C season). We had to put the resistor back in, and the problems magically went away.

[nickel-city-fab]

Just in the last week, I have said aloud: "Why is there never enough time to do it right, but always enough time to do it over?"
I mean, it's not like I don't know anything --
you need to train the bosses to understand that its usually cheaper to just do the job right the first time.
In my case, they usually need it right now, but then its still sitting there 2 years later. Yes, years.