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PaulJackson. Great post. Thanks.

Thanks drawoh. Looslib. That is exactly what I have in mind to tell him. But I am not sure his way is correct. Thanks.

A throttle shaft with two tap holes for mounting the throttle plate. Let put the shaft horizontally (left to right), draftman draws a vertical line between & midpoint of these two tap holes and calls it a datum A. He then make a basic dimension from this datum A (this vertical line) to one tap...

Unless I miss reading the posts, I have not seen a direct answer to the question I posted . Per the sketch I sent earlier, my question really is: 1. Can the hole in the left completely shifted vertically from datum B, but still meet pos|dia.00x|B-C| as required? 2. How to correctly establish...

fsincox, I have a page (pg 5-117) from Global Engineering Document, tenth edition 2000, dimensions & tolerances where it has both run out & cylindricity callout. Datum A-B where one is to itself. See attachment. My previous question is the TP to B-C where C is...

Thanks everyone for the comeback. A> pmarc: So the 2X on the B datum side with the TP callout will cover the other bore (other side)without repeat another TP callout? Y/N? Let assume that the drawing with the same callout as the sketch has already been released, questions: 1. How to check...

One more try. Sketch is attachedhttp://files.engineering.com/getfile.aspx?folder=4d34e236-d629-4325-8b83-93b68b69d943&file=20100823115656927.pdf

Thanks PeterStock. Here is the sketch. I just want to know if the callout is correct? or do we really need datum C & the TP of .003" to B-C? Your opinion would be appreciated. Uptick.

Here is the sketchhttp://files.engineering.com/getfile.aspx?folder=3080c1e9-953d-41ca-acd9-55175d62c6f9&file=20100823115656927.pdf

Sorry ewh. I did post overthere after finding out the correct location.

Hi all, Sorry. I posted in the wrong place before I posted this here. Mike: The datum A (the shaft thru hole) is already tight to the butterfly bore which I did not present here. Now the issue is the bearing bores are controlled the A. I wont to know if the callout is correct (valid). I know...

Hi there, I need your opinion on the case below: Problem: A buterfly valve with a shaft goes thru both side of the wall. Each side has a bearing bore callout. 1. The hole for the shaft is a thru hole with diameter A +/- tol with a datum A callout. 2. The bearing bore on the right states 2 X...

Sorry. The datum B callout is missing in the bearing bore on the right (item 2. Hope to hear from you soon. Thanks Uptick

Hi there, I need your opinion on the case below: Problem: A buterfly valve with a shaft goes thru both side of the wall. Each side has a bearing bore callout. 1. The hole for the shaft is a thru hole with diameter A +/- tol with a datum A callout. 2. The bearing bore on the right states 2 X...

Thanks all. Mikethe Engineer: I did check the co restroom before posting this. Thanks unclesyd: I had been thru those webpages before posting. Thanks Metalfixer: Good! I can start from there. Thanks.

Thanks unclesyd & Metalfixer. I just want to do it right (by spec) so that it can be removed by the removed tool.

I want to model (3D CAD) a one way drive screw but I can not find any information (dimensions spec) to begin. Can anyone help? I have been thru many websites but there is no luck. Thanks,

Thanks plasgear & Eltron. Eltron. I did check & they don't have it. I mainly want to see the detail dimension (or 3D model) of the round head of the one way drive screw (tamper-resistant screw).

Hi, I am loking for an ASTM spec (or other standard spec) that has detail dimensions for a tamper proof (or tamper resistant) screw. I am interesting in the slotted screw type. Please advise. Thanks

Great post! Thanks guys.