micro-SD Card Adapter Documentation Is Missing Some Critical Dimensions

idbruce

To Whom It May Concern

I was not sure where to put this grievance, so I am posting it here.

I am currently designing a board to which I want to add a micro-SD Card Adapter. The micro-SD Card Adapter and PCB board will be housed inside a project box, so you can imagine that all dimensions are critical for the designing stage, especially since I want to mount the micro-SD Card Adapter to the main PCB board and have the receptacle of the adapter placed within a cutout of the project box. I have attached an image that clearly shows the lacking critical dimensions for such an endeavor. Additionally, there is also no front view with dimensions that would help facilitate the design of the necessary cutout for the card receptacle.

Bruce

idbruce

Since nobody bothered to respond, I suppose I will have to proceed with an assumption. The micro-SD Card Adapter documentation includes a few additional measurements under the pictorial drawing. I have attached an image which shows these additional measurements.

One of these additional measurements state:

From the center of the mounting hole to the opposite side of the board, regarding the pins, is 0.275" (7mm)

I am assuming this is one of my missing measurements, going from the edge of the board to the hole center. All I can say is, "WHAT?"

pmrobert

Were it me, I'd probably call Parallax and ask if they could make the Gerbers available to you. I seem to recall prior similar instances where they were reportedly very accomodating - but my memory could be faulty. also, I have one of these and would be happy to measure the missing dimension. As far an access slot, the C3 plexi cases have a 13.5mm x 2.75mm slot that seems to be well proportioned.

-Mike

Addendum: your second missing dimension, as built on my sample, is 0.7 mm.

idbruce

@pmrobert

Were it me, I'd probably call Parallax and ask if they could make the Gerbers available to you. I seem to recall prior similar instances where they were reportedly very accomodating

Yes, Parallax is definitely very accommodating. Without any doubt, they usually provide specific documentation upon request. I would imagine that Parallax staff has not seen this thread yet, otherwise I would have probably already received an answer. I don't like to call for stuff like this, because then it only helps me as an individual, whereas if it becomes part of a thread and the question is answered, then everyone has access to the provided information.

As far an access slot, the C3 plexi cases have a 13.5mm x 2.75mm slot that seems to be well proportioned.

Now that is a very handy piece of information. Thank you very much for providing me with those dimensions.

Bruce

pmrobert

Some other as built dimensions you may find useful....

idbruce

pmrobert

Since you have digital calipers, I am sure you realize that all dimensions are pretty much critical when designing something, especially in a situation where seperate entities form a whole unit and where one entity must fit into the hole of another entity, with minimal clearance.

So yes:

Some other as built dimensions you may find useful

All dimensions are nice to have when designing something. Even if you don't think you need a specific dimension, you may discover that the lack of a specific dimension will impede your progress. Whenever I design something, I try to acquire all the handy information that I can gather, even if I don't think I will need it, because I have learned that I usually need that information, and then I have to search for it all over again.

So once again, thank you for taking the time and effort to provide the information and photos. You have been most helpful.

Bruce

pmrobert

I couldn't agree more as far as the need for accurate dimensions which leads to accurate successful builds. I usually work in metal which is just a bit unforgiving! Unfortunately, unless you're buying huge volumes ($$$) of something the CAD drawings are typically unavailable, as I'm sure you know. Attached is a photo of a VR sensor I'll be fabbing a sturdy bracket for later today. I feel your pain!
Parts "A" & "B"

Don't mean to jack your thread!

idbruce

pmrobert

Yea, I work with metal quite a bit also, so I understand the unforgiving part.

Some companies provide very detailed drawings with very accurate dimensions, while others provide somewhat adequate information, but still not quite upto snuff, and then there are those companies which provide very poor information, such as no drawings, poor drawings, or inaccurate dimensions.

Don't mean to jack your thread!

LOL... Don't worry about it. I am not as picky about it as some of the others. Although I am sure some of them would hang you from the nearest tree Anyhow, I like projects like yours, especially when it all works out perfectly aligned, just the way you wanted it and designed it.

Bruce