Emek (Gamma Core) Pump...Again...

[nak81783]

I mentioned this idea in a similar thread a while back, and for some reason it's stuck in my head again. Some things up front.

• I don't expect there to be a market for this that would warrant Planet Eclipse to make it. I'm just looking for feedback on the general concept.
• I realize these markups oversimplify and/or don't address all the mechanics, design, and part fabrication. Again, just looking for feedback on the general concept.
• This concept won't cycle the bolt like a conventional pump, since nothing attaches to the bolt.
• Pump handle forward blocks recharge. Can't fire until pump handle is pumped back, allowing it to charge [edit] front of Gamma Core [/edit], and then back forward, allowing it to [edit] first charge the back of the Gamma Core (if trigger is forward) and then [/edit] vent/fire when the trigger is pulled.
• Pump handle back blocks vent [edit] and charing of back of Gamma Core [/edit], so it can't fire while holding the pump handle back.
• EDIT: Rethinking this one. See post 3. Autotrigger would be baked into this concept with no way (in the simple markups) to deactivate it.
• EDIT: After staring at the cycle video some more, I think residual pressure would return the bolt even with the trigger held back and pump in forward position. I think the bolt would stay forward until it's allowed to recharge, at which point the bolt would return to home. I'm not sure, but bolt may return if there's enough blowback and/or residual pressure to bring it back.
• I think you'd have to pump it after gassing up to charge it for the first shot.
• Is there some type of brick or cylinder seal that could seal as shown in the markup, or would it need offset channels for each flow path, similar to a 3-way.
• With all that said, I don't see how more than one shot could occur with this markup without pumping.
• First image is pump handle forward with marker charged. Recharge is blocked but vent to fire is open.
• Second image is pump handle back. Vent to fire is closed. Recharge is open.
• I didn't take screenshots at the proper time in the video to show proper airflow. The images are just meant to show seal location for blocking/allowing flow.

I'll add more bullet points if I think of anything.

Thanks.

EDIT: Added chart of what I think the firing cycle would be. Really curious if there's a seal that would do this or if each channel would need to be offset, such that a 3-way type actuation would be required. It would also need a seal or seals around the pump rod.

[JeepDVLZ45]

Cool! I’m not mechanical enough to know what the heck I’m looking at, BUT I used to wonder if it would be possible to turn an EMek into a pump.

I think you should get to work 😉

[nak81783]

Gotta make sure I can finish my Jeepers Cheapers build (which this wouldn't qualify for), and then I might give it a try.

[nak81783]

Cool! I’m not mechanical enough to know what the heck I’m looking at, BUT I used to wonder if it would be possible to turn an EMek into a pump.

I think you should get to work 😉

Still trying to wrap my own head around it. I forgot the trigger 3/4-way uses the forward channel to charge the front of the Gamma Core, while the aft channel charges the back of the Gamma Core AND vents to fire. I think that means it would not autotrigger. Trigger would have to be forward to allow back of Gamma Core to charge. However, a different transfer block with a Y off of the forward channel above the pump seal to the aft channel would allow autotrigger...I think...I don't know, it might throw off timing.

EDIT: Y off probably won't work. It'll give the forward portion of the Gamma Core a path to vent out the back of the trigger valve. How much of an effect on cycle, timing, efficiency, etc., I don't know, but I'm tabling the Y off for now.

[Psycho91]

Jack woods has said it over and over again that PE will never make a pump gun, he says there's already so many good options that he doesn't see the need

[nak81783]

Jack woods has said it over and over again that PE will never make a pump gun, he says there's already so many good options that he doesn't see the need

Understood. That's why it's my first bullet point.

With all the cool stuff people on MCB do, if the transfer block sealing can be simplified, I think this is well within the forum's capabilities.

[Psycho91]

It would be pretty neat though, it would pretty much be indestructible and always work lol

[nak81783]

Agreed. I love the Gamma Core.