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drafting methods
4

drafting methods

drafting methods

(OP)
is it okay to dimension section views.

RE: drafting methods

Definitely, otherwise they would only be good for assembly drawings.

RE: drafting methods

   You shouldn't dimension in an isometric view because it doesn't show true size and shape and you can't dimension to a "hidden" feature. Cut views, section views, etc. are all okay as long as it is clear what the feature is that you are dimensioning (true size and shape).

RE: drafting methods

You can find everything you need to know about section views in Multi and Secional View Drawings ASME/ANSI Y14.3.  It's a good buy.  I'm currently redesigning a high speed miniture mechanism and was looking at the drawings.  I found numerous mistakes: wrong projections, wrong callouts, dimensions to hidden lines and the granddaddy of them all a section view with hidden lines

Best Regards,

Heckler
Sr. Mechanical Engineer
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Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.

RE: drafting methods

It depends on which standard you are refering to, and whether you are using board drawings or CAD drawings of solid models.  ASME Y14.41-2003 definitely allows dimensioning to axonometric views (which are similar to iso views) on the drawing.

RE: drafting methods

Section views are OK to dim. I agree, do not dim to hidden lines.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-05)

RE: drafting methods

Palecactus

Yes!


Ok that's the short version.  

I prefer sections to use of hidden line most of the time, I thought it was in a standard somewhere that sections etc are preferable but I couldn't find it last time I looked.

aardvarkdw,

I'm with you on ISO views but in my post the other day people seemed to think 14.41 might allow this.

Ken

RE: drafting methods

Not only are sections preferable, but dimensioning to hidden lines is not a preferable method per Y14.5.  Para "Dimensions should be shown in true profile and refer to visible outlines."

RE: drafting methods

Omitted in my previous post: Para 1.4(c)

RE: drafting methods

In some cases it is ok to dim to a "hidden" line, by drawing a broken out section, that makes the "hidden" line visible... but you should use this method discretely.

Wes C.
------------------------------
When they broke open molecules, they found they were only stuffed with atoms. But when they broke open atoms, they found them stuffed with explosions...

RE: drafting methods

But then it is no longer hidden;) - That is a widely used method to get around hidden lines.

RE: drafting methods

(OP)
IF ENOUGH INFO IS IN TWO VIEWS IN A DRAWING OF A PART, MUST YOU INCLUDE THE THIRD,(I:E TOP,FRONT,RIGHT)

RE: drafting methods

No, if a view adds no information (callouts, dimensions, etc) you do not add it.  Drawings are supposed to be a CONCISE definition of the part.

RE: drafting methods

You don't have to yell! lol
You only need another view if needed.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-05)

RE: drafting methods

In fact, some items only require one view, such as a cylinder or sphere.

RE: drafting methods

(OP)
sorry babout the caps

RE: drafting methods

I have a friend that used to teach drafting. He asked them to do a 3 view dwg of a ball bearing. Most of the class failed.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-05)

RE: drafting methods

For a cylinder I usually put two views.  People seem to miss the diameter symbol otherwise.  Or do you know something I'm overlooking?

On the hidden in Y14.5, thanks ewh don't know why I couldn't find that the other day.

Ken

RE: drafting methods

Your right that people may miss the diameter at first, but when they try to find the depth of the part, they usually see it.

RE: drafting methods

Chris,
  Was he requiring three views or just as many views as nessesary?

ewh,
  I agree there are times when dimensions are allowable in iso or axo views as with ASME y14.41 but that I believe refers only to 3d models not to 2d drawings. I may be wrong on that, as I've mentioned in other threads I am still working on getting a copy of the y14 series here.

RE: drafting methods

While the standard is aimed at 3D model definition, drawings are still allowed.  There are also changes to GD&T that are to be included in the next release of Y14.5.  If your restricted to Y14.5, then you will have to refer to ASME Y14.3 to determine if dimensioned iso views are allowed.  Unfortunately I don't yet have a copy of that standard.

RE: drafting methods

aardvarkdw,
Only 3 views. But, doesn't matter anyway, all views are the same.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-05)

RE: drafting methods

Sorry I wasn't more clear. I was curious to whether or not he was "requiring" 3 views. I could just imagine all the scratching of heads and attempts at making three "different" views of a sphere. In fact I can't help imagining Lucile Ball...

RE: drafting methods

Yes, he required only 3 views.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-05)

RE: drafting methods

ASME Y14.3 is no help. It is a carry over from the drafting board days and assumes people know better than to dimension ISO's.

RE: drafting methods

ctopher,

Out of interest could one of those views be an iso?winky smile

RE: drafting methods

No, An iso could be too difficult.banghead

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-05)

RE: drafting methods

They could use descriptive geometry on it!

RE: drafting methods

ewh,
Now, to a lot of new drafters, that's getting into too much science and physics.
rofl

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-05)

RE: drafting methods

Yeah, that went the way of the slide rule.

RE: drafting methods

(OP)
IS IT OKAY TO UP THE SCALE IN SOME VIEWS OF A DRAWING OR DO THEY ALL HVE TO BE THE SAME SCALE? THANKS

RE: drafting methods

As long as it is noted, yes.

RE: drafting methods

yOU CAN UP THE SCALE IN VIEWS OF A DRAWING, BUT THE SCALE OF THE SHEET (THE SCALE LISTED IN THE TITLE BLOCK) MUST BE THE SAME ON ALL SHEETS.

iT'S THE RULE.

RE: drafting methods

palecactus,
CHeck out the ASME standards. There are certain scales to use. You do not want to use for example 1.25:1 or 23:1.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

RE: drafting methods

palecactus,

ctophers advice about the standards would go for a couple of the questions you've asked.

I'm sure most of us are more than happy to answer questions but if you get a chance to look at the standards that will answer not just your immediate question but maybe tomorrows as well.

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