GD&T Application doubt

[Vimalmechs]

Hi all, PFA,

I am trying to control the width of the polishing area all around the profile(Hatched area in the image).My doubt is , applying profile tol is a right approach to achieve? . or is there any other approach to control the polished area by GD&T control?.i am with ASME Standard.

Vimal.V.V.

 

[JNieman]

I am having trouble understanding this drawing, I believe.

Am I correct in interpreting this drawing as a flat, rectangular plate, with only a rounded-rectangular path indicated by the shaded region as being the polished area you reference in your original post?

If so, I would have strong opposition to your method of locating the shaded region, and would ask you just how you would measure this on the actual part? I do find it interesting that you wish to /limit/ the area being polished, as well as defining the minimum area requiring it.

Otherwise, I would say that to control this polished area, you may be better served using 'legacy' dimensions, only, rather than a feature control frame.

Regardless of that sentiment, I believe profile of a 'line' would be more suitable than profile of a surface. Maybe on a microscopic level, depending on process, the polish will leave a small perpendicular surface (doubtful) but there is no perpendicular feature to create that boundary you're implying. Profile of a line would do so with the established reference features you indicate, I believe. I can't think of another way to use a FCF to establish the boundary. It would also be quite tricky to check verify the polished area within a 0.005" boundary.

_________________________________________
Engineer, Precision Manufacturing Job Shop
Tool & Die, Aerospace, Defense, Medical, Agricultural, Firearms

NX8.0, Solidworks 2014, AutoCAD LT, Autocad Plant 3D 2013, Enovia DMUv5

 

[Vimalmechs]

Jnieman,
Sorry for late turnback.
Hatched area is oring mating surface.and rest surface also functionally important.here I have applied profile of a line and with .020 tol zone value. I have removed two profile from th drawing and kept only one profile tol.attached to center line of hatched area.and I kept th width as basic dimension.
Vimal vv.