Re: Blueprint Bloopers Quiz



Anthony wrote:
BottleBob <bottlbob@xxxxxxxxxxxxx> wrote in
news:NsWdnSbVeMfU7CXUnZ2dnUVZ_u6dnZ2d@xxxxxxxxxxxxx:


Anthony:

21 I'm impressed. But some of those aren't really errors in the particular drawing, just a lack of extra notes.


Actually, not a lack of extra notes. Most of what I mentioned would actually be needed by the person making that part, do you not agree?

Anthony:

Well, yes and no. I think it's a perspective issue, but probably more yes than no. I don't think the writers of the quiz were looking for the level/degree of scrutiny you're applying.

Here are a few of their errors you listed:

> 13. Non toleranced dimension information missing

The whole title block is missing. You could count that as an error. But if it WERE there it should give a tolerance for fractional dimensions and one for 1 place decimal dimensions.

> 15. Location of rotating shaft not defined
> AND/OR
> 16. Part edges not defined from centerline (both axis, could count as
> 2 errors -> missing dimensions)

I assumed that the vertical and horizontal centerlines in the side view meant that the round feature D was in the center of the 5'0" vertical dimension plus the in the center of the 5'6" horizontal dimension. It doesn't appear to be to scale - so maybe you could call their omission of a note saying "Do Not Scale" to be another error.


> 17. Missing dimension --> Surface tolerance

In the missing title block?

> 18. Missing dimension --> GD&T related to shaft roundness,
> perpendicularity, etc

It's obviously not a GD&T print - so it probably shouldn't be held to GD&T standards.

> 19. Missing dimension --> allowable tool radii @ shaft to face

That should be in the missing title block.

> 20. Missing drawing information --> weldment or machined?
> 20(a). If machined, missing allowable tool radii for all internal
> machined features.
> 20(b). If weldment, missing weld symbols and weld specifications

You're assuming machined or weldment. It could very well be screwed & doweled together. Some prints note that the part is to be assembled with normal hardware (screws & dowels) without showing every screw and dowel location - but that note is missing so it could qualify as 20(c), eh?

If I were the teacher grading this quiz in class - I'd have to say you passed with flying colors - and would probably try to recruit you to draw up the next quiz. LOL


--
BottleBob
http://home.earthlink.net/~bottlbob

.

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