thanks Brian, I'll take a close look and see what the extent of the changes would be to adopt this. cheers Steve
On Mon, Aug 19, 2019 at 2:52 AM Brian K. White <[email protected]> wrote: > Steve, > > I think I have a pcb & carrier that might work better for you. > > I have to wait for the samples still, but here's what it looks like: > > https://raw.githubusercontent.com/aljex/pcb2molex8878/cham/pcb2molex8878.png > > On this one the pcb is a simple rectangle with no funky steps in the > corners, no polarity hole, and instead a simple chamfer on the pin1 corner. > > Dimensions are just 38mm x 16.2mm > For the chamfer, shorten two sides by 1.7mm > The carrier opening is 0.1mm bigger in both directions, so this is the > actual pcb dimensions. > > -- > bkw > > On 8/10/19 8:00 PM, Stephen Adolph wrote: > > Just the keys that fit the Molex. 2 on one end and one on the other end. > > > > On Saturday, August 10, 2019, Brian K. White <[email protected] > > <mailto:[email protected]>> wrote: > > > > What do you mean by stubs? > > > > The notches cut out of the corners? > > > > There needs to be something to hold the pcb from sliding sideways. > > The pin actually would do that well enough on one end, but since > > the pin is far to one end, the other end would move too much (I > > think), and you don't want two pins. So that little bit of > > skinnier pcb trapped between those vertical edges at the ends is > > enough to do it. > > And I think I will simplify that to just be 45 degree angles at > > the corners instead of those little steps the way it is now. > > That job could be done some other way, not just that way. There > > could be a single notch in the middle of the ends, and matching > > ridge in the carrier, and no walls at the corners of the carrier > > and no notches in the corners of the pcb, for one possible example. > > > > If you didn't already have a developed design with a lot of work > > already in it, and you were aiming to have all components on one > > side anyway for other reasons like manufacuring, then the carrier > > would be both stronger and effortless to make if the parts were > > all on top instead of bottom. The pcb has to lay pretty close to > > the bottom of the socket and so there is not much room between the > > pcb and the floor. Plus then you could have the hole for the > > polarity pin as long as you could make room between the traces. > > The pin doesn't extend above the pcb, so you can have chips over > > the hole, but not under it. > > > > -- > > bkw > > > > > > > > On 8/10/19 6:58 PM, Stephen Adolph wrote: > > > > Thanks, > > Why do you have the stubs for the molex on this drawing? I > > would have thought that such things would be unneeded with the > > carrier. > > > > I have to take a close look at length. I think it can work > > but with changes. > > > > > > On Saturday, August 10, 2019, Brian K. White > > <[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> wrote: > > > > Here is a messy pdf > > http://tandy.wiki/images/c/c7/Pcb2molex8878_pcb_dims.pdf > > <http://tandy.wiki/images/c/c7/Pcb2molex8878_pcb_dims.pdf> > > <http://tandy.wiki/images/c/c7/Pcb2molex8878_pcb_dims.pdf > > <http://tandy.wiki/images/c/c7/Pcb2molex8878_pcb_dims.pdf>> > > > > > >
