Jamma harness key slot plug

[processedmeat]

Not sure what these are really called but its that key that plugs into the jamma harness to prevent you from plugging in your jamma pcb the wrong way and frying it. This would be one of those items that would be perfect for 3D printing since you just whip it up when you need one. Anybody have a file for this? I can 3D model one but I don't have a real one to start with.

 

[twistedsymphony]

They call it a "key". I would think it would need to be slightly different depending on the specific JAMMA edge.

I think the last time I needed one I literally just shoved a piece of unused printer filament in the connector.

I did design one specifically for the Namco/Tekken kick harness since they have a somewhat different design: 3D Printed Tekken (Namco System 12) Kick harness connector key.

 

[nem]

All of my cabs have Hirose connectors, so here are the specs for the Hirose key (aka G-pin):

Width is 2.00mm except for the feet which are 2.60mm.

I really need to learn how to do 3D models...

 

[PascalP]

I did buy that key some time ago, but it didn’t fit my connector.
But I don’t recall if that was because my connector still had the connectors pins installed or if they were removed.
Was it the correct way?

I remember pulling a jumper from an old motherboard which was a perfect fit...

 

[SmokeMonster]

Great work, @nem, I'll see if I can find someone to make these https://twitter.com/SmokeMonsterTWI/status/1154495722714095617

 

[opt2not]

Yeah I'd like a few of these as well. All my connectors are missing them.

 

[SmokeMonster]

Wow, that was fast. Here is the design by Greg Collins: https://www.thingiverse.com/thing:3770398

Could someone please test this and report back?

 

[Frank_fjs]

Tested and working well for me. Fit fine in 4 different jamma connectors and also fits nicely within the jamma key cutout slot.

 

[ekorz]

I have a few sizes of jamma keys, bought from digikey and tested on a few different connectors (hirose, Sullins mostly) and I’ve found that if it sticks out like that i don’t consider it a fit. Too easy to knock out. The real fits are flush with the edge of the jamma connector. Maybe that’s just my preference?

I bet that key fits a hirose flush though

 

[Frank_fjs]

The edge connector has a tight grip on it, it's not going to be knocked out.

Works for me, printing a large batch of them now.

 

[RealMFnG]

I bought these for an EDAC brand connector for the Minigun project. They fit the Hirose edge connector perfectly as shown below:

US Happ edge connector are a different story as the pins are pulled from that position and requires a different key. Still trying to find a good source for those.

 

[Frank_fjs]

That's the Sullins connector in the picture. With other connectors it does push in further.

 

[Frank_fjs]

 

[APDWaldo6]

@Frank_fjs that’s the original file print he updated it with the cutout on the foot, but it should fit the same

 

[Frank_fjs]

Thanks, missed the updated file initially.

Fits like a glove, perfect.

 

[djsheep]

Just a PSA. I had a bunch of these printed around the time this post was made. Unsure if it was the material @Frank_fjs used, but they've since become brittle and I had noticed that all the tips snapped off.

I saw bits of filament falling out the JAMMA connector when changing boards and one touch of the piece remaining in the slot just disintegrated. I had a few of these unused that were printed back then and I was easily able to crumble them to bits also.

Removing the leftover fragments of filament from the edge connector was an absolute pain -- I used a Hakko Solder Tool to get in there, which worked out ok.

I have now upgraded and placed the made for purpose, Hirose G-Pins on all edge connectors in my arcade / superguns (thanks @xb74 for the hook up - https://www.cqbarcade.com/products/sanwa-denshi-g-pin-jamma-protection-insert).

I had a few from @axunworks that were printed from PCB material and those held up really nice and seem firm, but for consistency, I replaced those too.