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Posted

I'm basically learning AutoCAD as I go and teaching myself.

Can someone help with how I would draw a simple plate transition?

It would be 3' - 6 1/4" OD at the top and 10' - 6 7/8" OD at the bottom. It would be 62" tall. I draw this but can't figure out how to make it "flat" like a layout on a piece of plate to cut out and then form / roll into into it's final shape. I looked at one of our past project's drawings and it shows this, but looking at the dimensions on it, I cannot figure out how it was done.

Any help would be appreciated.

 

P.s. - using 2006

 

Thanks

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Posted

If you are referring to making the sheetmetal cutout template for a transition, you will need an add-on program or Lisp for AutoCAD, a stand-alone program that does flat patterns for transistions, etc. or a program like Inventer or ProE.

 

Here is a link to a similar thread for a pipe saddle, should be a similar procedure for a transition. http://www.cadtutor.net/forum/showthread.php?56374-Pipe-templates

Posted

Are you talking about a development of a cone Ø42.25 x Ø126.875 x 62"Height?

Posted
Are you talking about a development of a cone Ø42.25 x Ø126.875 x 62"Height?

 

That was my thought. Glad you came along you are better at this problem than I.

Posted
Are you talking about a development of a cone Ø42.25 x Ø126.875 x 62"Height?

 

Yes Sir, that is what I am talking about.

Posted

I wonder if the OP even knows what a "development" is?

Posted

[ATTACH]26469

 

This is a sample of what they did before. I don't see how the dimensions make any sense compared to what the cir, dia, or rad. Just trying to make sense of it so that I can do similar things myself.

transition help.dwg

Posted

I am guessing that the remark from "ReMark" is supposed to help me in some way that I don't realize?

Posted
I'm basically learning AutoCAD as I go and teaching myself.

Can someone help with how I would draw a simple plate transition?

It would be 3' - 6 1/4" OD at the top and 10' - 6 7/8" OD at the bottom. It would be 62" tall. I draw this but can't figure out how to make it "flat" like a layout on a piece of plate to cut out and then form / roll into into it's final shape. I looked at one of our past project's drawings and it shows this, but looking at the dimensions on it, I cannot figure out how it was done.

Any help would be appreciated.

 

P.s. - using 2006

 

Thanks

 

This is a drafting question rather than an AutoCAD question. As remark was alluding to, us old timers had to learn this stuff taking drafting classes while working on the board. With AutoCAD the work can be done much the same but with some significant shortcuts, like listing circumferences and using lengthen.

 

Anyway see if the attached makes any sense to you.

TRANSITION HELP RK.dwg

Posted

It's a commentary on the state of what passes for teaching drafting skills in this day and age. It's no reflection on you unless you want to take it that way.

 

A simple Internet search on the word "development" coupled with "mechanical drafting" would probably give you all the information you need.

 

Seek and ye shall find.

Posted

Sorry JDM but I'm not in a location where I can open your file. How about a synopsis?

Posted
This is a drafting question rather than an AutoCAD question. As remark was alluding to, us old timers had to learn this stuff taking drafting classes while working on the board. With AutoCAD the work can be done much the same but with some significant shortcuts, like listing circumferences and using lengthen.

 

Anyway see if the attached makes any sense to you.

 

Nice way of explaining it, made sense to me.

Posted
Nice way of explaining it, made sense to me.

 

Well of course the full explaination comes from the textbook and classroom lecture.

truncated cone developement.PNG

Posted

Notice on the originally posted file (tansition help.dwg) that the hidden lines are not trimmed/extended after offset.

I'll demo in a few minutes why this "mistake" is actually closer to real world than probably realized.

Trimming.PNG

Posted

Here is the actual corner in a 3D model. A sheet metal part is generally cut with edges perpendicular to flat - uniform thickness, therefore the geometry shown.

Thickness.PNG

Posted

I've got to run, but unless I made a serious mistake (and I doubt that) the dimensions the transition help.dwg file are way off.

The program I used calculated bend allowance which would account for some of the difference, but I don't think the bend allowance is that much.

I'll check tomorrow to make sure.

Flat Pattern.PNG

Posted

For the larger arc I’m getting the two extremes at approximately

9’-10 1/16” and 9’ - 11 ¼”.

 

 

9’ – 10 5/8” seems to account for a neutral axis at about

the midway point.

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