matched set drawing

[bxbzq]

Hello,
In my case, two parts are machined as a set, some features like bolt holes, pin holes, grooves, etc are machined this way. There is need to separate the two parts before assembling them. During assembly, pins used to fix the two parts during machining are used to ensure the two parts are positioned to each other as close to machining as possible.
So in this case, can I treat these two parts as a set and create matched set drawing for it? If yes, can I treat a feature formed by portion of the feature on each part as a single feature? For example, each semi-cylinder on each part, can I call up the finished 360° cylinder as a single FOS?

I've looked up Y14.24 and think the answer is no. But I still want to see real life experience.

Thanks for sharing.

 

[MikeHalloran]

Neglecting issues associated with keeping the parts paired over their lifetime and assuring that pairs are not mixed, I have to ask how you inspect the whole cylinder while its halves are separated. If that seems like a fuzzy answer, well, I'm a little fuzzy on the question.

But it raises another question: If you had the parts machined separately on CNC equipment, would that provide enough accuracy to obviate the need for machining the parts while paired?

I.e., you don't see many jig borers these days because many CNC machines are good enough to do that work.



Mike Halloran
Pembroke Pines, FL, USA

 

[bxbzq]

What if we inspect the whole cylinder while the two halves are still paired?

If you had the parts machined separately on CNC equipment, would that provide enough accuracy to obviate the need for machining the parts while paired?

I tend to say no. In addition to accuracy, machining a pair can also save some machine time.

 

[ctopher]

They can be machined together and checked together. But, they are two separate parts, two separate drawings.
Tolerance them the same, let the CNC machine them accurately.
I do this all the time. I machine the majority of the parts separately, then bolt/pin them together to machine the matched portion. Also drill for alignment pins while together.

Chris
SolidWorks 11
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