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The holes are functional, for assembly purpose

Thab Thanks a lot, I will combine hole table and add a position callout to the holes. However iso1101 does not mention about hole table.

Thanks a lot for your replay, I was looking at ISO. So now on this drawing I can just provide a position call out right?

Thanks for the brevity. My concern is, I have not seen this particular problem in any of standards. And, usually we give the coordinates wrt to a coordinate system, but if I provide a positional call out I have to provide datums. Can I tell that datum A is XY Plane for the coordinate system...

I have a plate which has some 500 hole of different sizes. Our usual practice is to provide a hole table with X and Y coordinates and a plus minus tolerance on the values. Is it possible to provide a positional call out to all 500holes and refer to the hole table as basic dimension. Thanks in...

Thanks pmark for the explanation

Axis of all cylinders considered together to be straight with in 0.5mm ie straightness, and when adjacent rings are considered, straightness of axis to be with in 0.25mm

sorry it was missed, reattached now

I am trying to tolerance an assembly which has three rings connected to each other. I have attached a simple drawing which shows the arrangement. My doubt is how to show in drawing that the straightness between adjacent rings is to be within 0.25mm and when considering all three rings together...

Thank you, jassco, 3DDave, Burunduk, for your clarifications. I have attached the updated drawing. Hope this is correct. Happy New Year

I have a drawing of a fitting which connects to a tube at a compound angle of 30deg and 45deg. Is this the correct way to show this (attached)

In th In the standard it is shown that the location is pairwise coaxial thus linking the Cbore and hole. Hope i am right ?

Thanks for your reply, i am attaching a ref drawing. I want to show that each hole of the bolt hole pattern on one face of the C channel and other face is drilled together so that concentricity between the drilled holes are with in a specified tolerance. Hope the question is clear now.

I am having a pattern of two concentric holes on both the faces of a C channel, these holes are drilled together in one go. The pattern has four sets of these two holes ( total 4x2=8 ). How to properly show this in drawing. I am using iso - gps

Yeah, I too wasted my time chasing this. Thanks a lot swc and rb1957 for your guidance and suggestions. I am going to tell them that if the model pass groundcheck you are good to go.

Swc: I am using CQUAD4 elements The client is insisting on rigid body modes of order 1e-6Hz or less. They will integrate my model to their very large model. They say that if they integrate my model to theirs, it might reduce the accuracy. I am not able to find a technical reason to reply to them...

Really sorry, please excuse my poor articulation. this is the femci book I told I started with a complicated model and got 1e-4Hz. Then I ran for simple model and got 1e-4Hz, that's all I want to improve this value to an order of 1e-6 Hz I was informed that for a free free analysis the first...

The shape is just a rectangular plate with 100x70 square CQUAD4 elements with pshell property and isotropic material. And first free free run is with another complicated model, Second run is with above said model. both provided first 6 rigid body modes of order 1e-4Hz, can you please guide me on...

SWComposites: 1e-4Hz, I was referring to the first 6 rigid body modes that we get in free free analysis. And How can it be improved

rb1957 : isotropic material is titanium and composite is CFRP. By shape you ment element quality, the plate is all CQUAD4 square, good quality