I would reconsider using a tolerance block if you're going to use GD&T and especially if you're going to callout a general all-over profile tolerance. This all-over profile establishes a generally loose boundary that is easy to manufacture for features and surfaces that don't interface or...
Harry Houdini, I would double check if you really need the requirement of specifying datums on every part. There might be cases where an all over general profile tolerance of .010" is sufficient for the functionality of the part. Also, something you might want to check is if any of your drawings...
Back to the original topic, and the issue of the ambiguity of interpreting the UAME of a shallow or 2D hole or flat circular spotface. What about calling out the location of the spotface pattern with the MMC modifier to invoke a datum related boundary? Then the edge of the flat portion of the...
You can also dimension angles by just clicking the line, then clicking one of the endpoints of the line, it automatically gives you options to create an angle dimension from imaginary horizontal or vertical lines.
Generally, size it to whatever is most ideal for the design and let the machinist determine what stock to buy. They might buy extra size for reasons besides clean-up anyway. Maybe they already buy a lot of 3-1/2" stock for another part and it would be easier to just order more of that size even...
Belanger, if the datum axis is created from the related actual mating envelope of the center post, which I understand to be the smallest cylinder perpendicular to datum A that would touch the high points of the datum feature (assuming a perpendicularity tolerance), what happens in the case of...
I'm curious, in this example, a go/no-go gauge would be a block with a Ø51 hole and a pattern of 6X Ø18 pins located basically from the Ø51 hole. The only relevance of establishing the location of datum axis B is in relation to the hole pattern correct? So the simulated datum axis B would be the...
drawoh, that's a good point about using section views to make things clear about how the depth is to be interpreted when the surface is curved or otherwise not flat.
Burunduk, I wonder if there are a pattern of counterbored holes if adding "INDIVIDUALLY" to the multiple instance callout would...
Sorry I'm referring to Fig 1-40 of ASME Y14.5-2009. For countersinks it is intuitive that controlling the diameter would automatically control the depth, and that for a severely warped plate, the countersunk depth would naturally follow the warped surface so that in practice, all the countersunk...
If the depth of a counterbored hole in the top face of a plate is directly toleranced, what is the proper way to measure the depth? Is it to a tangent plane established by the top face of the plate or would it be more localized e.g. measuring the depth with the tail end of a caliper? According...
I always thought that a FOS had to do with the geometry, but I guess according to the standard, if a have a simple rectangular block, and I use basic dimensions and an all over profile tolerance, the opposing sides of the block are not considered features of size because they are not associated...
In "The Ultimate GD&T Pocket Guide, 2nd Edition" by Alex Krulikowski, on page 13 there is a table that distinguishes Regular vs Irregular features of size. One distinguishing feature is "May Be Defined With Basic Dimensions and Profile" and it shows No for Regular FOS, and Yes for Irregular FOS...
Thank you guys for the information. To follow up, I did a quick simulation on a simple washer, and when I use a compression load the displacement shows the OD getting bigger, and the ID getting smaller. If there was hoop stress around the hole, wouldn't we expect the ID to get bigger? Maybe the...
I'm trying to understand why I am seeing cracks around bolt holes in a polycarbonate part that is made out of 1/8" thick sheet. I understand that PC is subject to environmental stress cracking, which involves chemicals accelerating small micro cracks under tension. What I'm struggling with is...
