castings, merge, show dims

[tracylcook1]

I made a casting part and merged to get a machined part. Is there a way to show the casting dimensions on the machined drawing????

 

[davisdony]

can u adjust with tolarence upper and lower limit option

 

[audctrl]

I'm not sure I'd want to show any of the casting dimensions and the machined print. When I set up the merge, I assemble the parts so there is a dimension from the cast locator to the first machine cut. If I absolutely needed to cast dimensions, I'd probably create the dimension on the machined drawing as a reference dimension.

 

[davisdony]

I am not getting you properly



Can u just explain with some pictures

 

[design-engine]

When I create drawings of a cast part that also requires machining, I push all the machining operations (cuts) to the end of the part. Most people will in order to save time create their solid cuts with protrutions all in one feature. This is bad practic e.

Instead create basic geometry with sketched curves and extrude only the solid geometry for your part. Draft and round the geometry. Dont forget to include cuts for securing the part in a fixture for machining. Round those.

Then in the end apply all your cutting geometry for machining.

To create the drawing you may decide to create a simplified rep of the machining operations.

or

you may decide to create a family table and lump all those features at the end into an instance. (how I did it back in 1994 or so)

or

using top down design (my preferred method)
to create all the machining operations on the copy geometry.


Edited by: design-engine

 

[mcgowanp]

Model it like you would make it for post machining parts. Model the part as it would be casted, with material added on in the areas to be machined etc. The machine guys will advise best of this. Then add in your machined features. I've been working with casted joint implants for many years and this is the way it has worked best for me. Also your machined features should be swept or modeled in the manner they will be made, which mostly means sweeping tool sections along trajectories, this doen't always work as easily as its said but thats the general idea. We have found that this method gives us the best end result to reflect the part that will be made.


To show the different states in a drawin then family tables work fine, there is nothing wrong with this approach, they can take a bit of time to regen, but they work fine.


Paddy