part before machining shown in drawing

[simonshuai]

I want to show detail of parts before machining in assembly drawings. I could use curves show the edges before machining, but I can't remove the edges after machining. Does anyone have ideas?

 

[appinmi]

I allways create my parts with Family Tables. Each instance represents the model at that operation. So in a drawing, I just call up the instance that I need.


If you want to create the curves to show the edges, put them on a layer. Turn the layer ON/OFF for each view in the drawing.

 

[stbassoc]

When I have to do a casting and machining senerio I create the "as cast" model as the part and the the "machined casting" as an assembly. All machining features are assembly cuts removing material.


You then have the ability to detail the "as cast" part model then have a seperate drawing detailing the machining assembly model.


It does create some confusion to people downstream,trying to figure out what the assembly is, but they quickly get over it after some explaining.


I suggest you agree on this process of documentation in your company. It has worked well for me.





scott

 

[Dell_Boy]

Whenever I have done castings and machining drawing I have always used family tables. One instance represents the raw casting and up to about 8 instances to represent 8 machining variations for 8 different products.

Why do you need to show the pre-machined outline. Is it not enough to
give the machinist the casting drawing and the machining drawing?


I would NOT recommend using assembly cuts to create the variants.



DB

 

[dr_gallup]

We have a group of parts that are made from two pieces brazed together and then machined. We make several different finished machined parts from one brazed assembly. Trying to use a family table of assembly cuts proved to be wildly unstable (pre wildfire release). We would save the finished drawing, quit Pro/E and then try to retrieve the drawing and it would fail to regen.

I highly recommend merging the casting into the machined part or using other techniques like copy geometry. The advantage over straight familiy tables is that it is much easier to keep straight which features and dimensions belong to the cast part and which belong to the machined part. You can always make an assembly drawing with the casting in phantom transparent display to show material removal allowance.

 

[mudassirkhan]

In our case, we make a casting/forging model and then we do an external merge of this cast/forged part in the machined part.. We then perform machining on this. I feel this is the best practice in the industry.
We too have some old drawings in which the machined outline is shown over cast/forged model but then it is just for better understanding of the vendor otherwise nowadays every vendor prefer to have a seperate cast/forged dwg and machined dwg. If at all you want to show the machined outline you can do it by datum curves or by cosmetic sketch.


Regards,

 

[rmckinley]

I believe that mudassirkhan is correct. I always use merged or inheritance models for cases like the one you describe.You create an actual model ofyour pre-machinedmodel and create its own drawing.Then you create a separatefinishedmodel which is a child of the first and create a separate drawing for it. The first feature of the machined modelis actuallyyour entirepre-machinedmodel.Thefin ish machined model will update when you change the pre-machined model. Family tables are one way to address what you are doing but I believe thatthat approachcan add unnecessary complexity in this case -- especially when you have to revise the design. I have also found that assembly cuts can be quite unstable.

 

[kfactor2]

Our company has solved the problem of casting/machining by creating the casting model and using an inheritance to do the machining. It has worked very well for us and prevented alot of the errors we were finding when we had used two seperate models one for casting and another for machining.

 

[appinmi]

If you use family tables, the "casting/stock material"and all machining operations can be done with one model. Therefore there can be no errors between the "raw material" and the machined part.