Orthgraphic projection help

[Jack_O'neill]

Im in the final now, and i gues im allowed to use anY sources i want, including internet : )

 

You better guess correctly, else you'll find yourself taking the class again.

[JPlanera]

Touche, Mr. O'neill

[dieselixi]

So, I took the final today, It wasnt that bad just under a little presure because of the time limit. Im going to post the the final on here for anyone that whats to give it a try. I want to thank everyone for all the help and advice.

[JD Mather]

What standard?

ANSI standard leading zeros are suppressed in inch drawing (not in metric).

Cylinders are dimensioned in rectangular view preceeded with Ø symbol.

Words like depth and counterbore are no longer used - use symbols.

Full circles and holes dimensioned as diameter - considering the manufacturing process eg a drill is specified by diameter size.

 

See attached for solution.

Test.zip

[JPlanera]

JD, I think the instructor may have dimensioned that way on purpose... Notice the Note "DIMENSIONS AND DIMENSIOIN STYLE ARE FOR REFERENCE ONLY". I assume the reasoning for this is to prevent people from "copying"... I would suspect he expects his students to point out the fact that it is not dimensioned as the standard suggests. BUT, im not a teacher... How do you present this type of problem to your students?

 

 

Edit: I re read your post JD, and it looks like you were pointing that out already... The posted "solution" gave it away... Ha! I think my new rule is, "Drink at least one cup of coffee in the morning before posting on CADtutor..."

Edited December 15, 2010 by JPlanera
I think I take it back....

[rkent]

What standard?

ANSI standard leading zeros are suppressed in inch drawing (not in metric).

Cylinders are dimensioned in rectangular view preceeded with Ø symbol.

Words like depth and counterbore are no longer used - use symbols.

Full circles and holes dimensioned as diameter - considering the manufacturing process eg a drill is specified by diameter size.

 

See attached for solution.

 

JD, When I drew that in Inventor the section view only showed half of the 3/8-16 hole. Did you draw that in or is there a way to make Inventor show the whole hole?

[JD Mather]

JD, When I drew that in Inventor the section view only showed half of the 3/8-16 hole. Did you draw that in or is there a way to make Inventor show the whole hole?

 

Yes, I had to do a bit of "AutoCAD - like" touchup on that hole. This brings out an interesting point is that I will have someone say to me in effect, "What good is Inventor if it doesn't do everything for you? That is why we should still teach the AutoCAD techniques." Completely ignoring that 95% of the work was done automatically, it is associative to the model (so if the model changes...) and the touchup details to meet standard practices can still be taught using the modern tools. I just roll my eyes and walk away.

 

I was also tempted to say a bit more about fillets, face draft and machined surface finish since it says on the drawing that the part is cast iron, but decided to leave well enough alone.

[ReMark]

Gad zooks.

[dieselixi]

JD -Is there any way you can post a picture of the drawing you did, I only have autocad and I dont think I can open your file with it.

[JD Mather]

If you have AutoCAD you have Design Review. If you didn't install Design Review (free) then download it and install to view the dwf file.

[rkent]

Yes, I had to do a bit of "AutoCAD - like" touchup on that hole. ..

.

 

So is there a way to snap to the resultant half circle in the idw and draw the full circle? I have tried looking around and right clicking but the snaps don't seem to work on that. I am in sketch mode in the idw while trying to add the two circles for the threaded hole. Or do you just zoom in and get it close?

 

Thanks

[JD Mather]

So is there a way to snap to the resultant half circle in the idw and draw the full circle?

 

Project Geometry - just like in part mode, to project the geometry you want to stap to into the current sketch.

[rkent]

Project Geometry - just like in part mode, to project the geometry you want to stap to into the current sketch.

 

I have worked on it, looked in help and the book I have and I cannot project geometry in the idw and then snap to it. I can sometimes get the Project Geometry tool to turn from gray to black but not consistently. Once I project the geometry I can't snap to a center point of the circle. Any pointers you can share?

[JD Mather]

Once I project the geometry I can't snap to a center point of the circle.

 

The circle is not a circle. Remember it is the projection of a curve created when a cylinder cuts an interesecting cylinder.

Create your circle and then add 3 coincident constraints - 2 endpoints and 1 midpoint. (no centerpoint)

The second tip is to make sure you are in a sketch in the view. I see beginners get into a sketch at the sheet level rather than the view level.

I recommend clicking the view boundary and then hitting S to start a sketch rather than moving the mouse to the sketch tool.

 

This discussion is going to get confusing for those not realizing we are discussing Inventor rather than AutoCAD.

[rkent]

Thanks for the help. I will post any further questions in the IV area.