HOLE PATTERN POSITION CONTROL- FCF SUGGESTIONS
HOLE PATTERN POSITION CONTROL- FCF SUGGESTIONS
(OP)
Hi all,
Please have a look on the PFA.
My Functional requirement is, I want to control the movement of hole pattern.” Pattern should be parallel to DATUM A or B or together, holes should shift together and hole pattern can move within .04 dia zone.
1) All the holes should be within .04 dia zone .
2) Hole pattern should move together. pattern rotation is not allowed more than .010 zone. Movement should be parallel to A DATUM or parallel to B DATUM or BOTH.
I have implemented FCF based on my requirement. Any one please highlight that any alternate options are available to achieve the same?
Vimal VV
Please have a look on the PFA.
My Functional requirement is, I want to control the movement of hole pattern.” Pattern should be parallel to DATUM A or B or together, holes should shift together and hole pattern can move within .04 dia zone.
1) All the holes should be within .04 dia zone .
2) Hole pattern should move together. pattern rotation is not allowed more than .010 zone. Movement should be parallel to A DATUM or parallel to B DATUM or BOTH.
I have implemented FCF based on my requirement. Any one please highlight that any alternate options are available to achieve the same?
Vimal VV





RE: HOLE PATTERN POSITION CONTROL- FCF SUGGESTIONS
RE: HOLE PATTERN POSITION CONTROL- FCF SUGGESTIONS
Also, which GD&T standard are you using? (ISO or ASME)
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: HOLE PATTERN POSITION CONTROL- FCF SUGGESTIONS
I am using ASME.
Vimal VV
RE: HOLE PATTERN POSITION CONTROL- FCF SUGGESTIONS
So re-write datum feature A as the back face, datum feature B as the bottom edge, and datum feature C as the left edge. Then the only changes to the composite feature control frame would be to add datum C to the upper portion, and add datum B to the lower portion.
If you have a copy of the ASME standard, the datum references would look much like the callout in Figure 7-39 of the 2009 edition, or Figure 5-20(e) of the 1994 standard.
You might also consider an MMC modifier after the tolerance values, but this depends on the function of the holes.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: HOLE PATTERN POSITION CONTROL- FCF SUGGESTIONS
RE: HOLE PATTERN POSITION CONTROL- FCF SUGGESTIONS