So I made my own on/off today (pics)

[Pneumagger]

Just used c360 brass, some unknown grade of stainless, and 7075 aluminum on a lathe. I'm still witing on the top orings and the aluminum top needs a chromic acid coating for protection. In the pic you can see it next to a classic on/off and a ULT. You can also see one of my pins next to a standard .750 RTP pin. Notice how the head is fatter and the post is thinner. The thinner post should make the pull lighter than a standard RTP on/off but the fatter head is where the real magic happens. This should make it ultra reactive. If the numbers work out, it should have about 3.5x more rectivity than a standard RT on/off. That means the feel of "2000psi reactivity" at only 800psi input. No grinding down pins or chipping bolts... just a lighter pull and more reactivity.

I'll be testing it in an xvalve and minimag valve around wednesday. I'm waiting for the top orings to arrive from mcmaster carr. It's going to use a quad ring but since it's bigger than standard I din't have a larger quad-ring on hand. I only have a CF frame (single trigger) minimag to test it in with a 800psi preset inline maxflo tank. If I can get RT full auto with that setup that'll be impressive. Sucess or failure... testing vids will be posted.

[WarHamster]

Will you be offering these for sale if they work out how you hope?

[Zone Drifter]

If these work out better for reactivity, I would LOVE to put one in my classic RT... that is if they'll fit.

[Pneumagger]

Will you be offering these for sale if they work out how you hope?

Only if I can outsource the pins to a centerless grinding shop. Machining stainless is not enjoyable... putting a mirror finish on a .062 diameter one inch long pin just plain sucks. Basically you gotta use a sharp tool and VERY VERY slow feedrate. The only reason I machined them myself was that the grinding shops I asked for quotes from failed to respond after 10+ days of waiting and I'm impatient.

It took 6 attempts to make the 2 pins in that pic... and one of them is still no good (too short).

If I have to hand-make for people there'd be no market because I'd be charging $70+ each.

[Pneumagger]

If these work out better for reactivity, I would LOVE to put one in my classic RT... that is if they'll fit.

It absolutely requires an on/off hole compatible with double orings. Like air valves and xvalves. Similar to the ULT requirements. If the valve can fit a ULT, it should be able to fit this.

I think some Retro and some RT valves only had a single on/off top.

[y0da900]

Have you considered trying to do pins from 303 or one of the other "free machining" stainless steels? Might make them significantly simpler to turn as usual and not have to have them ground. Some of the free machining tool steels that don't have exotic heat treating requirements might also be a doable alternative, like W1.

Nice work, I'm interested to see how it turns out.

[OPBN]

I only have a CF frame (single trigger) minimag to test it in with a 800psi preset inline maxflo tank.

I'm down in the Lima area. If you are looking for test fodder, I may be willing to send you an intelliframed, xvalved mag for some testing. Of course....

[Pneumagger]

Have you considered trying to do pins from 303 or one of the other "free machining" stainless steels? Might make them significantly simpler to turn as usual and not have to have them ground. Some of the free machining tool steels that don't have exotic heat treating requirements might also be a doable alternative, like W1.

Nice work, I'm interested to see how it turns out.

This is all prototype. doing one off pins with whatever material I have for now is fine.
Although, I think I wouldn't want to use 303/304/316 again.
I'm pretty sure 7075-T6 aluminum is stronger and harder than those common stainless and machines like a dream.

I found a centerless grinding place in cleveland that does all sorts of stuff. If these are actually ever produced the pins will be centerless ground 17-4PH or 6AL-4V Titanium. As soon as this is tested, assuming no major changes, I'll get quotes on the parts if people are interested. I would think I could have small runs (about 25-50 kits) made for less than $50.

OPBN, wanna meet up in masfield? There's gotta be some fields

[OPBN]

OPBN, wanna meet up in masfield? There's gotta be some fields

I've played at a place in Mansfield a year or so ago. My brother and I play a few times a year up at Battlefront in Hubbard. Typically, June and July are terrible for me to get free. I'll hit you up in August some time.

[spece108]

The top hat resembles a Reactor design while the bottom looks like a modified old fashion Max-flow piston. Love the new dimensions on the pin. How fun

[behemoth]

I've played at a place in Mansfield a year or so ago. My brother and I play a few times a year up at Battlefront in Hubbard. Typically, June and July are terrible for me to get free. I'll hit you up in August some time.

We need to have an AO Ohio get together at Battlefront one of these days.

Joe, me, you, timbo, etc.

[OPBN]

We need to have an AO Ohio get together at Battlefront one of these days.

Joe, me, you, timbo, etc.

Blitzkrieg on August 20th or any of the later games would be good for me.

[kcombs9]

very cool

I thought the ULT had such a light pull cause of the smaller head not pin dia, less surface area on the head = less pressure pushing it = lighter pull + less reactivity.

But I could be wrong

Looking forward to some test vids.

[hill160881]

This may make for a heavier trigger pull. The top of the on off pin has a larger surface area and thus may require more finger pressure to fully push it to the top position. it will undoubtedly be more reactive though. It may be a worthwhile trade off.

I look forward to seeing the test results. As I cant really visualize how this will affect the weight of the pull.

Very cool

[KC]

I think some Retro and some RT valves only had a single on/off top.

Correct.