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Hi, I am looking at Aluminum 4032-T6 and 4032-T651. From what I understand, both processes are the same with the exception of stretching process for the T651. Since the material is stressed by 1-3%, would that affect the yield strength and/or ultimate strength of the material? How do we know...

Hi, I have an application where two aluminum plates (6061) are joint together by screws. One plate has a counterbore hole while the other plate has a threaded hole. I haven't decided on the screw size yet, but it will be between 1/4-20 and 1/2-13. The plates will be subjected to 250C with...

Thanks for the answers

I have a question about press fitting plastic part. On the drawing, the customer calls out for a fit per ANSI B4.1 FN2. The parts are both made from plastics (Vespel). Would it be appropriate to use the tolerance limits from table 11. ANSI Standard Force and Shrink Fits? The customer doesn't...

Hi, Imagine if I had a plate of stainless steel 316L 1"W x 5"L x.25" thick. On top of the stainless steel plate was a small graphite sheet with the same size and only .04" thick. I put them inside a furnace and applied pressure (8 psi) of both side to keep them together. I ran the furnace up...

@Belanger: I agree with you, and I also believe it stated in the book somewhere that unless otherwise stated, all dimensions are inspected at free state. That is actually why I thought the part should be rejected. Even though the "local" distance between the pocket and the top is within...

This is a hypothetical example, but it is applicable to a lot of my company's parts. I would like to get a better clarification on this. We use ASME Y14.9-2009. Attached is the drawing to give a better visual representation. Basically, if I have a plate with a pocket that calls out .040...

Hi, I am trying to take a thermal image of a glass plate inside vacuum. The back of the plate will be heated using a heater. A thermal camera, outside of vacuum, is used to take the picture of the glass plate through a small ZnSe windows. The problem is that the glass plate surface is smooth...

I am having problems with press fitting tolerance. On a drawing, it is called out to press fit a dowel pin per ASME B4.1 FN 1, so I looked up the table for a .250 dowel pins. According to the table, my interference should be from .1 to .75 thousandth of an inch. Now, is this interference for...

To all, Thanks so much for all the response. They are all really helpful. The Q.A department at my company always checks the parts with CMM machines, and the part is always stationary during the inspection process. That's why I really didn't understand the idea behind datum shift. I have a...

Hi engineers, I have a question regarding about specifying datum feature at RMB. What are the advantages of having a datum shift since we are not getting any more or less bonus tolerance? Wouldn't it complicate the inspection process since the part can now move (shift) around? There is an...

Thanks Dave, Powerhound and others, It is pretty clear to me now.

@3DDave: there is one more part that will sit on top of this part, and it is located using the three .250 holes. What I have trouble with is when I use something like a 3 jaws chuck to locate the outer surface, the center of the OD moves if I rotate the part. Imagine if I put the part on to a...

Hi, I have a question related to center of a circular feature with big tolerance. Please refer to my attachment for better clarification. If Datum B is chosen to be a Datum feature, and it has a tolerance of +/- .020. The 2.500 circle has a true position callout for a .004 diametrical...

Here is table 4-1 http://files.engineering.com/getfile.aspx?folder=ba2c0223-b0a1-42c7-a723-93d3875f8247&file=table_4-1.JPG

I guess I am not using the Parker handbook correctly then. Most of my application using the face seal gland. According the the book, for external pressure, I should dimensions the groove by its inside diamenter H = Mean I.D of Oring ( see table 4-1). However, I can't find mean I.D of o-ring...

Thanks guys, Since you brought up compression ratio, I assume it is the same as Squeeze percentage on Parker handbook. In term of stretching the o-ring during installation, is there any guideline on how much should the o-ring be stretched to achieve certain compression ratio? I am having trouble...

Hi, I used the Parker o-ring handbook for most of my o-ring groove design. I just have one question regarding different o-ring width. What is the advantage of using a smaller or bigger o-ring? Imagine if the ID of the o-ring groove is 1 inches, is there a different if I use a 1/16, 1/8, 3/32...

To all, Thanks for all your input especially Belanger and Powerhound. They are really helpful. I don't really have any background as a QA inspector or drafting, so all of these info are a bit too much to digest at once. I'll do more research to understand concentricity completely. As for...

Belanger, Thanks for your input. How exactly would you measure concentricity and coaxility? Assuming that you have a CMM machine. Let's use the example I attached. Units are in mm. What would be the possible outcome of concentrity that can not happen with coaxiality? how would you measure...