Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Largest Manufacturing Technology Community on the Web
Stay Connected:
Thru the barrel coolant
- Thread starter gmich
- Start date
- Replies 16
- Views 4,671
dero338
Plastic
- Joined
- May 11, 2013
- Location
- moskito land Canada
its in my plans to rig one up sometimes and that is what I am planing to use
Buy Deublin Air & Hydraulic Rotary Unions | Rotating Unions | Swivel Joints - R.M. Hoffman Company
they last for years sometimes decades running 24/7 on marine engines pneumatic clutch.
Buy Deublin Air & Hydraulic Rotary Unions | Rotating Unions | Swivel Joints - R.M. Hoffman Company
they last for years sometimes decades running 24/7 on marine engines pneumatic clutch.
GenePoole
Cast Iron
- Joined
- Dec 8, 2012
- Location
- St. Louis, MO
The Deublin fittings work well and require very few other parts. I just use a short length of vinyl tubing and some hose clamps. Coolant is supplied by a modified (smaller bypass spring to reduce pressure) carbonator pump.
Last edited:
NRDock
Cast Iron
- Joined
- Jan 24, 2015
- Location
- Central Pennsylvania
That fellow who used to post here, but has moved on to accuratereloading advocated using a simple pneumatic quick coupling for a rotary joint.
They may not last forever, but you can buy them at the local hardware / farm / big box store, and they're cheap.
They may not last forever, but you can buy them at the local hardware / farm / big box store, and they're cheap.
Does anybody see the good reason why this would not work?
SPEEDAIRE Steel Swivel Connector with (M)NPT Hose Connection - 30E593|30E593 - Grainger
SPEEDAIRE Swivel Connector,1'/'4 - 3 E593'|'3 E593 - Grainger
SPEEDAIRE Steel Swivel Connector with (M)NPT Hose Connection - 30E593|30E593 - Grainger
SPEEDAIRE Swivel Connector,1'/'4 - 3 E593'|'3 E593 - Grainger
300sniper
Hot Rolled
- Joined
- Nov 14, 2006
- Location
- Greenwood, Ca
Go to Deublin’s website, find a rotary union that meets your requirements, then search that part number on eBay. The one I’m using now is good for 12,000 RPM and I think I paid a few hundred for it. That’s not nescesarry for most people. You should be able to find something around $50.
SilveradoHauler
Cast Iron
- Joined
- Jan 6, 2008
- Location
- Mountains of Washington State, USA
This subject has been discussed in the past both here and on gun forums. Acurate Reloading, Accurate Shooter, Benchrest Central to name a few. Google and the search function on each forum are your friends.
There is an ongoing discussion of muzzle pumped systems now on Accurate Shooter.
You can buy components or make your own. I made my system some 30 years ago. 10 gallon sump with integral pump behind the lathe.
There is an ongoing discussion of muzzle pumped systems now on Accurate Shooter.
You can buy components or make your own. I made my system some 30 years ago. 10 gallon sump with integral pump behind the lathe.
NRDock
Cast Iron
- Joined
- Jan 24, 2015
- Location
- Central Pennsylvania
I prefer the quick coupler idea. First, the quick coupler is easy to install and disconnect. Second, it maintains straight alignment. Put an elbow on it, and it's straight down to your reservoir and pump. The swivel, isn't straight, and doesn't look like it turns 90 degrees. Actually, if it is straight down to your reservoir, it doesn't even matter if it leaks a little.
300sniper
Hot Rolled
- Joined
- Nov 14, 2006
- Location
- Greenwood, Ca
Danny1788
Plastic
- Joined
- Oct 22, 2013
- Location
- Central Coast, CA
If your a cheap A$$ like I am, maybe try this....
I setup my barrel in the lathe and center the muzzle super quick only to .001" then I drill and tap it 1/8"NPT with a short bottoming tap. Take the barrel out and setup back in the head stock with the breech in ready for cutting the tenon. Dial in the barrel how ever you do it. I use a cheap swivel air fitting and a 1/4"NPT to 1/8"NPT brass fitting and screw it right into the barrel never leaks and spins easy.
I setup my barrel in the lathe and center the muzzle super quick only to .001" then I drill and tap it 1/8"NPT with a short bottoming tap. Take the barrel out and setup back in the head stock with the breech in ready for cutting the tenon. Dial in the barrel how ever you do it. I use a cheap swivel air fitting and a 1/4"NPT to 1/8"NPT brass fitting and screw it right into the barrel never leaks and spins easy.
I thought I understood until I thought about tapping the muzzle end to 1/8" (.125"). Even a .177 is too large for this. So clearly I don't understand what your tapping. I did find the air swivel adapters and wondered if they would not be perfect for this but I assumed I would have to step sizes to the coolant hose and the barrel muzzle O.D.
GenePoole
Cast Iron
- Joined
- Dec 8, 2012
- Location
- St. Louis, MO
1/8 NPT is like 1/4 or more in actual thread major diameter. See Machinery's Handbook.
GGaskill
Titanium
- Joined
- Feb 14, 2001
- Location
- Central AZ
Tap drill for 1/8 NPT is a Q (.332").
Danny1788
Plastic
- Joined
- Oct 22, 2013
- Location
- Central Coast, CA
Its 1/8" NPT which is closer to 5/16" and yes I drill with a Q drill bit .332" so this works for anything under 8mm if you do a 338 rifle barrel just drill and tap for 1/4" NPT threads.
Similar threads
