Round bar - drawing the curly bit on the end

[Trugga]

Greetings all first post.

 

Appologies for the message title, but hopefully it is descriptive enough.

 

On occasions, I need to show a cut in a length of steel bar (or tube) in a 2D drawing. If I were to draw it by hand, I'd do it like this:

 

(OK, so that is actually a 3D model of a 100mm dia bar with a 200mm dial bar subtracted from it and then rotated 45 deg)

 

Using AutoCAD 2010, I can only get this far

 

 

I've tried various hit-and-miss attempts with "spline", but I'm sure there must be a logical or mathamatical way to complete the loop.

 

Any help greatly appreciated.

 

Lawrence

[ReMark]

You are attempting this in 2D right?

[JD Mather]

Most drafting books cover a simplifed method of drawing this break. Do not try to exaclty duplicate the results from a 3D model.

 

A couple of moves, mirrors and tangent tangent tangent for the fillet and trim it up.

Cylinder Break.dwg

[stevsmith]

I basically draw 2 ellipses on the end and trim away the the inside of one ellipse then mirror to the opposite side.

There should be no need to make things that complicated.

[Trugga]

You are attempting this in 2D right?

Yes

 

Cheers JD - your example does give a fair representation.

 

I think with a combination of JD's example and the ellipses I should get a consistant and reasonable result.

 

I did wonder if there was some form of logic involved (like the development of a truncated cone), but perhaps just for a break point it does not really matter.

 

Cheers guys

 

Lawrence

[stevsmith]

That just seems like alot of excess drawing to me.

Cylinder Break rev a.dwg

[ReMark]

While I admire your attention to detail if you're going to this much effort now what will you do when you have to draw something that is really complex?

[Eatonpcat]

I basically draw 2 ellipses on the end and trim away the the inside of one ellipse then mirror to the opposite side.

There should be no need to make things that complicated.

 

We have a winner... Simple as this!!!

[ReMark]

Does this mean no more entries will be accepted? Darn!

[stevsmith]

Whoopie.

 

I actually go one right this week, after such a troublesome month. lol

 

 

(Oh, my post count has went to 666, (better The devil you know)) hahaha

[alanjt]

http://www.theswamp.org/index.php?topic=19267.0

 

Whoopie.

 

I actually go one right this week, after such a troublesome month. lol

 

 

(Oh, my post count has went to 666, (better The devil you know)) hahaha

 

LoL

[stevsmith]

Nice idea.

[Eatonpcat]

Looks like we have a new winner... Alanjt!

[stevsmith]

Looks like we have a new winner... Alanjt!

 

Yes, in this kind of field, cheats always prosper.

[Eatonpcat]

Yes, in this kind of field, cheats always prosper.

 

 

Is it really cheating if you don't get caught???

[alanjt]

Looks like we have a new winner... Alanjt!

 

Glad I could help. I only pointed you in the direction of something someone else wrote.

[Trugga]

I've found a solution too...

 

In AutoCAD Mechanical 2010, from the menu bar, select:

 

Content - Shafts Components - Shaft End

 

TaDaaa

 

Thanks for all the ideas though - it's been interesting.

 

Lawrence

[Tankman]

Very nice! Yinyang!

[Tankman]

http://www.theswamp.org/index.php?topic=19267.0

 

 

 

LoL

 

Beautiful! I do have YinYang and could use this *.lsp file.

Where can I find this excellent routine?

 

I have YinYang in my startup suite, wouldn't be without it!

 

TANKS a zillion!

[alanjt]

Beautiful! I do have YinYang and could use this *.lsp file.

Where can I find this excellent routine?

 

I have YinYang in my startup suite, wouldn't be without it!

 

TANKS a zillion!

 

I posted a link above the GIF. BTW, I didn't write these. I just remembered them from a while back and dug up the link to Ron's work.