Trouble with Hammond 1551USB1 enclosure - Page 1
Forum section: electronics / general

author: xcvii
author_rank: Newbie
timestamp: February 13, 2019, 06:50:14 am
content: I’m trying to design a board for the 1551USB1 (http://www.hammondmfg.com/pdf2/1551USB1.pdf), but can’t seem to figure out how to place the USB-A connector.Most of those connectors specify just about the same footprint and it looks like this (attached) when naively placed. It looks wrong for more reasons than one, but I’m most worried about the clearance around the screw hole.Am I using the wrong connector? Is there something else I’m missing?Thanks a lot!

author: Jeroen3
author_rank: Super Contributor
timestamp: February 13, 2019, 10:08:28 am
content: I've drawn this box with a Moles 48037-1000 USB connector. That fits fine.Maybe you've drawn the connector wrong?

author: xcvii
author_rank: Newbie
timestamp: February 13, 2019, 10:59:50 am
content: That looks like a different enclosure, though.

author: Jeroen3
author_rank: Super Contributor
timestamp: February 13, 2019, 11:59:13 am
content: I used the step file from the 1551USB2.

author: Psi
author_rank: Super Contributor
timestamp: February 13, 2019, 12:07:13 pm
content: Maybe they are expecting you to use castellated holes for the USB mounting tabs.And bring the socket out a bit further so it clears the screw hole.

author: MarkF
author_rank: Super Contributor
timestamp: February 13, 2019, 01:27:08 pm
content: Quote from: Jeroen3 on February 13, 2019, 11:59:13 amThe OP stated 1551USB1 though. It's step file looks like...What is the part number of the USB connector you want to use? Through hole or SMD? Plug or jack?

author: xcvii
author_rank: Newbie
timestamp: February 13, 2019, 02:33:43 pm
content: Quote from: MarkF on February 13, 2019, 01:27:08 pmI was using the footprint from here:http://cnctech.us/pdfs/1001-011-01101.pdfNo preference between THT and SMD, This is a hobby project, it will be only a few units and hand soldered.

author: MarkF
author_rank: Super Contributor
timestamp: February 13, 2019, 03:56:34 pm
content: It looks like your connector will just fit with the edge of the pin at the edge of the standoff.With suggested max PCB size from the Hammond datasheet.

author: Psi
author_rank: Super Contributor
timestamp: February 14, 2019, 12:04:12 pm
content: The funny thing is it's probably cheaper to buy USB thumb drives on aliexpress and throw away the PCB than it is to buy hammond USB enclosures.

author: xcvii
author_rank: Newbie
timestamp: February 14, 2019, 12:23:46 pm
content: Quote from: Psi on February 14, 2019, 12:04:12 pmYeah, I did think of that, but a lot of those don’t look like they can be opened non-destructively, or seem to require special connectors, so I figured I’d save myself the time and money experimenting with them.These hammonds are not that expensive, either, and they should be straighforward to use — or so I thought (:

author: xcvii
author_rank: Newbie
timestamp: February 14, 2019, 12:34:43 pm
content: Thanks guys, lots of good answers. In the meantime Hammond came back to me, too. They suggested extending the pcb by 0.5-2mm.I’ll try these suggestions when I get the time and report back.