Finally, finished my gun with my Home-Made "Tomba" system

[Rafter]

Hello guys,

I own an old Mares Cyrano 850. I took it apart long time ago because it was leaking. I noticed the front muzzle had a little crack, so I thought I put in a dry barrel system on the gun while i replaced the seals. I have access to a cnc lathe and milling machine. So I made a replica of Tromic's Tomba system. Thanks Tromic. I also use the tips i found on the website on how to make the gun a little more powerfull. I completely removed the inner
"low power" white block. The low power pin was corroded anyways and broke when i tried to remove it. I used silicon and epoxy to seal the hole. I made a small video showing the gun assembled and explaining what i did. It is my first you tube video so go easy on me guys. I added a small check valve to prevent hydro-lock when loading the gun. The check valve works great but i need to make sure it does not become a tangle problem. I will post as soon as i test the gun on how this works.
Since i modified the gun i could not get the local shops to air fill it for me. I was putting together a system to do it using my scuba tank, but i got lazy and decided to just buy the one they sell online from mares. Again, thanks to Tromic and all you guys for the valuable info you provide. here is the video link,

 

[foxfish]

Looks great, hope it works for you.

 

[Diving Gecko]

Nice work and nice color;-)
Yeah, we talked about check valves in the past for the dry muzzles, but I think you are the first to actually do it. So, let us know if you have tangling problems or not.
And kudos to Tromic for sharing the knowledge.

 

[Diving Gecko]

BTW, with access to a (CNC) lathe, I am surprised you didn't make your scuba "pump" yourself;-).
I hacked one together with off-the-shelf parts but if I could proper CAD and had the access, for sure, this would have been a project I'd love to do - prolly right after a muzzle;-)

BTW, I have this dream of making a pneumatic gun pretty much from scratch and I like the small check valves you sourced. Can you share the brand/model number, pls?

 

[Rafter]

BTW, with access to a (CNC) lathe, I am surprised you didn't make your scuba "pump" yourself;-).
I hacked one together with off-the-shelf parts but if I could proper CAD and had the access, for sure, this would have been a project I'd love to do - prolly right after a muzzle;-)

BTW, I have this dream of making a pneumatic gun pretty much from scratch and I like the small check valves you sourced. Can you share the brand/model number, pls?

Yes, the one I bought is the brass one from McMaster Carr. part number is 8567T31 they also have a 303 SST one but i think this may eventually corrode. I will try to find out the p/n for the fitting i used. Here is a link to the site.

http://www.mcmaster.com/#check-valves/=11bllly

http://www.mcmaster.com/#8567T31

 

[tromic]

I am glad that you are having a good time making modification that allow loading the spear guns with the former Tomba700 under water. This is useful especially for scuba.
Regards, Tomislav

P.S.
This was a solution without using check valve:
https://forums.deeperblue.com/threads/tomba-all-in-one-barrel-sealing.81791/page-43#post-943477

 

[Rafter]

P.S.
This was a solution without using check valve:
https://forums.deeperblue.com/threads/tomba-all-in-one-barrel-sealing.81791/page-43#post-943477[/QUOTE]

Yes Tomi, I know that was the solution proposed to accomplished the same thing. Since I was able to find a valve small enough to work; I just though, I'll give it a try without having to modify the spear. I made a couple of extra parts in case this doesn't work i will just replace the tip part. Thanks

 

[Rafter]

Gecko,

The miniature elbow fitting is also from McMaster Carr. Part number 544K58. See a link below. I used a 10-32 threaded stainless steel set screw, that I drilled though, to connect the valve to the elbow fitting.

http://www.mcmaster.com/#5454K58

 

[tromic]

Rafter, your solution using the check valve is fine. I had an idea to use an O-ring placed in a groove having small boring to let water out of the muzzle - same purpose as check valve. But that would decrease the reliability of holding the vacuum. I had no idea about existing such a tiny valves. With Tomba700x the position of the valve might be after the shock absorbers front end.