dimensioning ellipse, rho?

[nracingdev]

hi guys,

I have a question pertaining to conic arcs. In pro E when i create an engineered drawing containing a conic it dimensions with rho value.

my question is, do machinists understand this value? What is the best way to express this dimension in terms the machinist can easily understand?

sorry for my ignorance, im new to this.

THANKS IN ADVANCE,
0CHRIS

 

[TheTick]

I doubt it (no offense, machinists).

Two most readily grasped methods are major & minor diameter or by major diameter plus degrees off normal axis (like ellipse templates are classified, viewing circle at off angle).

 

[KENAT]

Funny, I had this argument with a contractor about 6-7 years ago. They claimed the rho value would be understood by the machinist etc as it was a value they had to enter in the tool.

Well, fast forward a few days to after the contractor had left and, no the machinist didn't have a clue what to do with the rho value and we had to redo the drawing.

So, I'd probably go Max & Min as well as a note explicitly saying ELLIPSE so it's not confused with some kind of ovoid (is that the word I mean?) of 2 tangent radii. Ticks other technique should work but I've always seen max min on drawings.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?

 

[nracingdev]

thanks guys for the fast reply. do you know of any way to force proE to give me those dims or am i going to have to just enter a note and hand write?

THANKS AGAIN!
CHRIS

 

[KENAT]

Well it's been a while since I used Pro E so I'm not sure about forcing it to give those dimensions 'automatically' but you should be able to manually create dimensions across the length and breadth and add a text note saying ELLIPSE.

You could ask over on the Pro E forum forum554. You might want to link back to this post by pasting the above thread number thread404-235593.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?