Align This

[granpagus]

I like this one.
It is a machined aluminum piece, approx 1 X 2 X 1.5 inches. Hollow.
When I get it, it is still attached on the side so I have someting to hold on to.
There are no datums specified.
The only flat features are the mounting surface on the face and a small area on the bottom (green on the left and right view).
The top has a surface at 16° to the face and a small hole that is dimensioned to the face and bottom surfaces.
Clear?
I plan to level to the face, rotate to a couple points or a line on the bottom and then translate these features plus either the hole at the top or the hole at the back.
For dimensioning the hole at the top I plan to use a pierce point to a plane at the top. Tolerance is ± .001.
There are some other features to measure, but much looser tolerances.
I am using an iges, and of course all axis need to be changed.
Does all this sound plausible?

[dwade]

There are no datums specified.

I'd be asking someone to get the design engineer to get involved and assign some datums to the part features.

Never ASSuME what the datums are. It'll only bite you in the butt later.

[Bill **********]

What DWADE said.

In my opinion that part is an excellent candidate for an iterative alignment.

Bill

[craiger_ny]

When no datums are specified I align to the tightest toleranced features. I also explain to the engineer what I am doing and make sure he concurs that it is prudent.

[BSchwark]

Understanding the function of the part may help in your dicisionsns in aligining the part when datums are not present.

[Andrew Gardner]

Understanding the function of the part may help in your dicisionsns in aligining the part when datums are not present.

I agree, but that has come back to bite me as well. Like craiger, I usually use the tightest tolerance to align to, if the engineer is not available.

[bw_bob]

Pretty much what others said.........Looks like a bedpan.........

[dwade]

Looks like a bedpan.........

The pdf says it is a "rear enclosure"

[bw_bob]

The pdf says it is a "rear enclosure"

Looks like a bedpan with a drain hole. Thats all i'm saying.......

[T Miller]

Well a bedpan is sort of a Rear enclosure

[granpagus]

Very small bedpan.
All my decisions on this part are run by my favorite engineer (plays a great blues guitar). Well at least he's got something going for him.
And the cad is no help. Nominals don't match the drawing.
First try says one critical feature is way off. That will be fun to deal with when I get in.
Haven't tried iterative yet so maybe its about time. That is if I can find any (time)
And this isn't even one of our own designs

[Cumofo]

http://mud.mm-a2.yimg.com/image/2264967937We will never know what craiger thinks, until craiger thinks it.






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