Are Parting Lines Included, or Excluded.
Are Parting Lines Included, or Excluded.
(OP)
In the notes of a print:
MAXIMUM PARTING LINE PERMISSIBLE:
THICKNESS: 0.18
EXTENSION: 0.10
DIMENSIONING AND TOLERANCING IN ACCORDANCE WITH ASME Y14.5M-1994
On the field of the drawing is Ø40.4 ±0.1
If the part is produced to Ø40.5, how much flash extension is permissible? or what would the diameter measure across the parting line - suggesting the parting line lies on the Ø40.4 surface.
1.4(d), (e), & (f)
Is the dimension (0.10) subject to more than one interpretation?
Is specifying parting line equivalent to specifying drill or tap?
Should the thickness and extension also be highlighted as NON-MANDATORY (MFG DATA)?
MAXIMUM PARTING LINE PERMISSIBLE:
THICKNESS: 0.18
EXTENSION: 0.10
DIMENSIONING AND TOLERANCING IN ACCORDANCE WITH ASME Y14.5M-1994
On the field of the drawing is Ø40.4 ±0.1
If the part is produced to Ø40.5, how much flash extension is permissible? or what would the diameter measure across the parting line - suggesting the parting line lies on the Ø40.4 surface.
1.4(d), (e), & (f)
Is the dimension (0.10) subject to more than one interpretation?
Is specifying parting line equivalent to specifying drill or tap?
Should the thickness and extension also be highlighted as NON-MANDATORY (MFG DATA)?





RE: Are Parting Lines Included, or Excluded.
The last paragraph makes sense if you see the rest of the spec I think it's based on if you have a combined casting & machining drawing or separate drawings. Or it may be a difference between casting and forging drawings, I just realized I'm not sure.
As to the note I'd guess it was talking about flash extension, which is on the parting line. It could be referening mis match as well/instead but it's not clear to me.
If I understand the spec correctly the the flash tolerance is usually a separate requirement.
I'm not very knowledgable on castings/forgings but hope this helps.
KENAT, probably the least qualified checker you'll ever meet...
RE: Are Parting Lines Included, or Excluded.
You qualified for another feather in your checker hat. Thanks.
RE: Are Parting Lines Included, or Excluded.
The only caution I'd make is the the 14.8 standard says:
So it's debatable if the conventions in 14.8 apply to your drawing if it's not referenced on the drawing. However, 14.5 does list 14.8 as a reference (para 1.2) so you could argue that counts as "document reference on the drawings" but it's a bit weak to me, I've had the designer explicitly ref 14.8 on the drawing even though 14.5 is already referenced.
KENAT, probably the least qualified checker you'll ever meet...
RE: Are Parting Lines Included, or Excluded.
The specification references aided in clarification.
3.8 states that a Ø40.7 dimension is an acceptable part.
You are an asset to this community.
RE: Are Parting Lines Included, or Excluded.
V
RE: Are Parting Lines Included, or Excluded.
RE: Are Parting Lines Included, or Excluded.
That aside, the ASME Y14.5M-1994 came out before the ASME Y14.8M-1996 and therefore references the ASME Y14.5M-1989. Weak became weaker. The case will be presented to reference this on current documents as revisions are made as well as future issues.
dgallup - as I familiarize myself with the 14.8 that is coming to light. I was stating the unstated worse of the worse case. And I vaguely recall reading that the flash extrusion is measured from where the flash intersects with the drafted wall out for compliance.
RE: Are Parting Lines Included, or Excluded.
There is flashing around a circle! As long as we don't add basic to the flashing, we'll be OK.
Chris
SolidWorks/PDMWorks 08 3.1
AutoCAD 06/08
ctopher's home (updated Jul 02, 2008)
RE: Are Parting Lines Included, or Excluded.