deskthority

I placed the plastic separation between the membranes on top and painted with pencil the contours.
I also placed the plastic foam on top and painted in red the holes
The details follow:

My conclusions are:

1.- Some missing holes
2.- Some error in the printing. Small
3.- Some errors in the position of the holes. The error is bigger than the printing error.

I guess that I need to learn how to create the PCB file, if not, the process will take ages.
My problem again is that I am very busy at present.

Regarding the errors comparison:

in this picture, if the border of the plastic is compared with the position of the hole, one can see that the displacement errors do not match



On the other hand, the hole error (red) is matching the printing error ... I cannot conclude if it is correct or not.

I also conclude that for the prototypes, it is not recommendable to order the PCBs with the holes done.
One can always drill them with enough precision.

This will remove a potential failure mode. I many PCBs are required after the initial prototypes (I do not think that this will be the case) they could be added later.

Sterling work, i$. I'm in no rush anyway as my barrel frame is in America while my SSKs are all in Scotland! I'm many months away from getting things together even if I wanted.

idollar wrote: I also conclude that for the prototypes, it is not recommendable to order the PCBs with the holes done.One can always drill them with enough precision.

Sure, we can silkscreen where we think they should go.

Would you please try the paper template on the back plate to check for that hole above F1? I know that is not correct. I need to get closer as I want to use it for grounding.

Thanks

Sorry, it looks like idollar beat me to the punch here, as I was looking to print these out in the office. Ah well. Maybe I can be of help some other way.

XMIT wrote:Sorry, it looks like idollar beat me to the punch here, as I was looking to print these out in the office. Ah well. Maybe I can be of help some other way.

If you're still willing, it might be worthwhile to make a second set of measurements just to double-check. Measure twice and drill once, you know...

XMIT wrote: Sorry, it looks like idollar beat me to the punch here, as I was looking to print these out in the office. Ah well. Maybe I can be of help some other way.

wcass wrote:

idollar wrote: I also conclude that for the prototypes, it is not recommendable to order the PCBs with the holes done.One can always drill them with enough precision.

Sure, we can silkscreen where we think they should go.

Would you please try the paper template on the back plate to check for that hole above F1? I know that is not correct. I need to get closer as I want to use it for grounding.

Thanks

Alright: The following pictures are bad quality. The tripod is stored back. I was on my way to bed

I have placed the paper on the back of the metal plate. Looking down. Using the "pencil" technique that we all used when kids to copy coins I marked where the screws are. I then made holes with the top of the pencil to see where they were.
The results follow:

There is some lateral displacement:
More details follow:
Notice the lateral displacement again. I have folded the paper and marked the fold with a dashed line

My updated conclussions:

1_ We need to ensure that the printout has no error
2_ It will be simpler if I work the file locally. I will PM you wcass

I only have fullsized model m's but I would be interested in one of the prototype pcb's. If they work, this would be an awesome design.

cinnamonrollz wrote: I only have fullsized model m's but I would be interested in one of the prototype pcb's. If they work, this would be an awesome design.

If the FSSK works, doing the FEMK (F Extended model M Keyboard) should be trivial.
The only issue, once more, are the F flippers that one need to source someone. But we will deal with this latter. One problem at a time is enough.

Too many acronyms!

Apparently, Unicomp still has spare SSK barrel frames in stock, after all these years. Those should all be the last revision of IBM's design, and a known starting point. Could be a good idea to prototype this mechanism with one of them.

Shhh...not even Unicomp know they have them!

True, and yet we got two! Perhaps the lack of self awareness is why they still have any.

idollar wrote:

cinnamonrollz wrote: I only have fullsized model m's but I would be interested in one of the prototype pcb's. If they work, this would be an awesome design.

If the FSSK works, doing the FEMK (F Extended model M Keyboard) should be trivial.
The only issue, once more, are the F flippers that one need to source someone. But we will deal with this latter. One problem at a time is enough.

You could source them from Ellipse's new F62/77 project.

Vizir wrote: You could source them from Ellipse's new F62/77 project.

I know. This was my message between the lines.

idollar wrote:

Vizir wrote: You could source them from Ellipse's new F62/77 project.

I know. This was my message between the lines.

Ah, got it.

Any news with the project?
Oh yeah, do you plan a PCB with windows keys between CTRL and ALT? Or exactly the normal SSK layout?

hammelgammler wrote: Any news with the project?
Oh yeah, do you plan a PCB with windows keys between CTRL and ALT? Or exactly the normal SSK layout?

You have to be patience. I am busy at present.
The layout will be as the SSK layout. No changes

Hello,

I spend some time today to model the holes in the FSSK.
The next step is to paint the pads.

I decided to make my own version so we can compare the two independently made pcbs at the end as a kind of quality control.

There is no logic with these holes. One has just to measure, print and correct. A nightmare.

I need to find some time to continue with this.

In general the file works fine.
The extended model M has he holes in the same order. So I am thinking of creating a CAD file with one extra set of layers to cover the normal model M also:
I need to correct some errors. The holes are only there to avoid routing copper through this area. The plan is to order the PCB without the holes. But we better do things right from the beginning. This needs to be corrected:
I hope to progress this during the weekend. Lets see if we have a full PCB by then.

Great to see some progress. Not sure what you are thinking for the PCB fabricator, but I used PCBway for the XTant and I was happy with their pricing and quality.

vivalarevolución wrote: Great to see some progress. Not sure what you are thinking for the PCB fabricator, but I used PCBway for the XTant and I was happy with their pricing and quality.

Thanks for the tip. I will check it, for sure.

Nice! This is the single most promising keyboard project that I know of. Having tried your F, I can only imagine how awesome this could be...

We may get some more traffic in this thread, idollar, since I linked it in Ellipse's 4704 revival thread (which is nearing completion). Do you have any updates on this project for us?

jajaja

I have seen your post

I am taking Friday off. I will try to finalise the prototype of the PCB. It will then be a matter of ordering it. I have all the parts at home.

Wow! So you will build a complete, hopefully working prototype? Exciting!

Nice to see this going further, I'm very interested in this project too !