Composite or 2 single segment FCF to control perpendicularity of hole
Composite or 2 single segment FCF to control perpendicularity of hole
(OP)
I have a single hole in a part that has fairly loose location requirements but needs tighter perpendicularity refinement at MMC.
I've attatched a simplified (may be incomplete) sketch to try and illustrated my case.
Should it be a composite control or 2 single-segment FCF or maybe 2 completely separate FCF.
I Browsed 5.4 of ASME Y14.5M-1994 but it's focus is on patterns. I'm sure I've done this before but can't recall how.
If someone could point me in the right direction I'd appreciate it.
I've attatched a simplified (may be incomplete) sketch to try and illustrated my case.
Should it be a composite control or 2 single-segment FCF or maybe 2 completely separate FCF.
I Browsed 5.4 of ASME Y14.5M-1994 but it's focus is on patterns. I'm sure I've done this before but can't recall how.
If someone could point me in the right direction I'd appreciate it.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?





RE: Composite or 2 single segment FCF to control perpendicularity of hole
Why do you not use the perpendicularity symbol as per Figures 6-37, 6-38, 6-39, 6-41, and 6-42? Those last two figures show perpendicularity errors of zero at MMC.
RE: Composite or 2 single segment FCF to control perpendicularity of hole
I am pretty sure that it is illegal to use composite tolerance for other than a "pattern".
You might want a looser location tolerance with a refining perpendicular control for the axis. However I am not so sure a projected tolerance zone is legal for the perendicular callout. It would seem to technically work the same way regarding perpendicularity of an axis.
DesignBiz
RE: Composite or 2 single segment FCF to control perpendicularity of hole
DesignBiz
RE: Composite or 2 single segment FCF to control perpendicularity of hole
Thanks, I originally was looking at perpendicularity but gave up before I reached figure 6-38 which shows almost exactly what I want, it has both MMC & projected tolerance zone (take a look at 6-38 DesignBiz, and at section 5.5 in the text).
Problem solved, thanks very much star for you.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Composite or 2 single segment FCF to control perpendicularity of hole
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Composite or 2 single segment FCF to control perpendicularity of hole
DesignBiz
RE: Composite or 2 single segment FCF to control perpendicularity of hole
Looks sorta like a case of gross OK. (overkill)
For a reasonable assessment, one should know the interface. otherwise you are shooting blindly.
Not trying to be too harsh, but realistic.
RE: Composite or 2 single segment FCF to control perpendicularity of hole
I know the interface, I have the drawings of the mating parts right here on my desk. I know that as currently dimensioned & toleranced it is causing problems.
My problem was that I'd forgotten/didn't know about applying perpendicularity at MMC with a projected tolerance zone. This was why I'd initially rejected using perpendicularity and was trying to use a position refinement, I only cared about the perpendicularity at/near MMC.
The sketch was to illustrate this specific issue. It is not exactly the same as the drawing I'm looking at. I'd hoped the "simplified (may be incomplete) sketch " covered this.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Composite or 2 single segment FCF to control perpendicularity of hole
RE: Composite or 2 single segment FCF to control perpendicularity of hole
I was searching forwards and gave up at figure 6-37 for some reason, having convinced myself it wouldn't work for me.
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?