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Interesting question. Here is my shot at something I know little about but would like to know more about. Wouldn’t it be reasonable to believe for RFS, that after the part is positioned according to the referenced DRF, a probe would touch off of both ends of the part to establish the vertical...

Ringster, I am in complete agreement with you. I only was trying to make a point regarding the 2nd drawing where the center hole, profile of the plate, and the pattern of the plate share the same centerlines without any reference to an explicit datum in the simultaneous requirement example...

Funny you should ask. Short answer...no. First design of flexible tube looked like a bow; like when you tie a shoe string. The first drawing, not so good.... lots of stuff crossing each other. I confusing looking drawing at best. Nice young man with potential... just no experience yet. Makes...

Axym, You're right; I like to hear the comments of more or less controversial topics that pertain to Y14.5m standard. "opening cans of worms makes wince, while "stirring the pot" makes me smile, as your comment did. I particularly find your point of view from quality engineering's perspective...

Ringster, In attempt to produce the basis for my claim on an earlier post that ANSI y14.5 1973 allowed for the datum feature symbol to be placed on a centerline, in order to accommodate the people of Missouri (show me state?) (and I really don’t have documentation verifying you are a Missourian…...

fcsuper, I agree with your comment and would gladly have 3 basic views for orientation which these drawings commonly do not have. I have been troubled that most creators of drawings, and most unfortunately checker's at this point, don't understand the need these days. My position is to have the...

Thanks for your inputs KENAT ! DesignBiz

JLang, I personally dont like general defaults as a shortcut. If you are going to take the time to label a surface and then reference that surface to a note; then why not just add the GDT flat control while your at it and eliminate possible confusion? If its important enough to identify a...

KENAT, Unfortunately this isnt even a company standard. Nothing is written anywhere. It is a verbal edict. DesignBiz

KENAT, There is not a Y14.5m standard that I am aware of regarding the datums attached to 3d models. This is internal to this company and refers to the capability to attach GDT datums to features of the actual 3D model. These datums can be viewed if the correct software switches are turned on...

Sorry about that SeasonLee, I see on a later drawing posted that 2X correction was already made. Didnt see before my post. I agree with some of the comments above that you are doing a good job with improving this drawing. DesignBiz

KENAT, This is not a trick question, however I would like to consider comments from others. From what you write, I think we are in the same camp. Our drawings callout tolerance of position for holes. All other features are claimed to be the master and basic based on the math data (CAD model)...

For drawings that might have a default profile callout, how is the specification in section 6.5.1 para. (a) reconciled? (a) "An appropriate view or section is drawn showing the desired basic profile." I take it that this is in reference to the 1st sentence of the 1st para. in 6.5.1; "The...

Ringster, Tricky business to get everything clarified 1st time round [3eyes] DesignBiz

correction for #3 of my previous post: .015 step mismatch for profile tolerances at point N. DesignBiz

Ringster, Tell me what the size of a clearance hole resulting in a minimum of .50 clearance for a 25.0 dia pin should be; based on a rectangular tolerance zone of +/- 2.5 (feel free to choose english or mm units) Attached sketch DesignBiz...

1. 5.2.1.1 making all dims basic; “Untoleranced dimensions locating true position are basic.” Aren't basic dimensions used for profile definition locating features too? I believe so. 2. You actually have Datum B as the pattern now since the datum symbol is attached to the leader that has...

The question posed assumed that the floor and 2 walls had controls to “square them up”. A DRF is determined by identified theoretical datums on a drawing (or CAD model). In this case “walls” are being used as datums. Datum simulators establish those datums in an inspection setup. Lets say an...

Not so sure when we get to repeatable DRF's and examples with sep reqt that we simplify or answer the original question. Considering the PLTZF can be verified separately from the FLTZF, it would appear that PLTZF(s) would need to follow the simultaneous req rule in regard to other FCF's with...

JLang17, Maybe I am over simplifying the control but I do see you are talking about a cube. For just what you are doing it doesnt sound like you need a full DRF to accomplish it. You could pick the floor to be Datum A. Use a flat control on A. Use perpendicularity to A for "squaring" it up as...