Jump to content
Sign in to follow this  
saltydecimator

gas tube replacement options? for short gas sys gun?

Recommended Posts

ok, tried t odo a 13" gun but could never get to run birdshot with the ports not ridiculously massive....so ive turned down barrel in lathe and have the tromix shorty gas piston replacement, but im still confused as how to deal with the gas tube problem.... some folks seem to beat the ridges out? others make new tubes? im sure its simple buuuuuut

Share this post


Link to post
Share on other sites

0qWQ2zv.jpg

 

while lookin for pics of shortened gas tubes, i came acroos this, pretty interesting!!

Custom built PSL by a board member on akforum.net. Want to try doing one of these someday.

Share this post


Link to post
Share on other sites

You can easily waste a ton of time on it and still end up with something that will not work well or look good. Just get the Tromix tube and focus your time and efforts on more important aspects of the build.

Edited by evlblkwpnz
  • Like 1

Share this post


Link to post
Share on other sites

If you must do it yourself, try using a sucession of ball bearings and knocking them thru with a BFH and punch. Anneal the part before starting and between each size of bearing. This will keep it from cracking as you stretch the metal. Always knock the bearing thru cold. Temper after reaching the desired size.

Share this post


Link to post
Share on other sites

I think that would run a good chance of growing the thing lengthwise, or buckling the end as you push the bearing through. Also keeping the bearing or mandril, or whatever centered would be the big difficulty. Typically the weakest spot will deform, and all the force will go that way. IMO, just buy the tromix one.

Share this post


Link to post
Share on other sites

0qWQ2zv.jpg

 

while lookin for pics of shortened gas tubes, i came acroos this, pretty interesting!!

Ah, the Russian bottle-opener stock! Purpose-built for those huge bottles of vodka!

Share this post


Link to post
Share on other sites

It's not a bug, it's a feature. Annular fluting for faster cooling.

  • Like 1

Share this post


Link to post
Share on other sites

It's for a Russian gun. It is supposed to have rough machine marks wherever it will have no effect on function.

  • Like 1

Share this post


Link to post
Share on other sites

Has some dang machine marks though. I gotta read up on how to work with the slop

Back your cross slide out a few turns and then go back into the workpiece. Do the same with your compound slide. If you run either back out at all then you have to do it again. Just pay attention to where you are before you back out in terms of the dial (can't remember what it is called, one more cup of coffee please, lol). You may be able to adjust the gibs to make it a little tighter (I have no clue exactly what you are working with and I am under the assumption it is a well worn lathe). I hope this helps.

Edited by evlblkwpnz

Share this post


Link to post
Share on other sites

Slop like the backlash in the dials? If so take evil's advice, the machine I use at school has about 50 thousands before actual tool movement happens. Just pay attention to what number you were at on the previous cut

Share this post


Link to post
Share on other sites

Slop like the backlash in the dials? If so take evil's advice, the machine I use at school has about 50 thousands before actual tool movement happens. Just pay attention to what number you were at on the previous cut

I bought a new lathe last year and it had slop from day one. I adjusted the gibs a little to reduce transverse movement, but no matter how I am doing it, if I run away from the piece or headstock at all I go out further and then back into it. +1, the dials are your friend.
  • Like 2

Share this post


Link to post
Share on other sites

gotcha... and prob using dull crappy taiwan(what.gif ) bits isnt helping.... more like scraping off the metal vs cutting it!  anyways, im gonna confuse things more by suggesting that the barrel stub can be used to turn into the gas tube!   seriously folks, mic it! (mayeb this is already common knowledge?!?!?!)

Share this post


Link to post
Share on other sites

I've been messing with my tailstock(that's what she said) for a couple of weeks now(3 days a week, couple of hours each) and finally have it down under a thousandth from one end of my 29 inch blank to the other. I pray to God that someone in another class doesn't start tapering their barrel before I do and throw it out for me. Our machines are well maintained but are still about 50 years old with hard student/learning curve usage. Carbide is my friend.

 

As for using barrel scrap, never occurred to me, I don't have measuring stuff handy, or any stubs to play with(that's what she said) but I'll take your word for it, not a bad thought. And your scrapping comment reminded me of a video someone was telling me about the other day where they watched a guy octagon a barrel on his lathe. He had a custom ground bit, the machine was off and the barrel was locked in place, and he just traversed his bit across the length of the barrel until he'd created a flat, indexed 90 or 180 degrees and did it again. I'd forgotten about it, I want to see it, I'm gonna go look for it now.

Edited by Goose

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

Tromix - Lead Delivery Systems
Dinzag Arms
CHAOS, Inc
Mississippi Auto Arms, Inc
Cobra's Custom
Carolina Shooters Supply
R & R Targets
LONE STAR ARMS
SGM Tactical
Mach 1 Arsenal
K-VAR
C&S Metall-Werkes
American Specialty Ammo
Csspecs Magazines
Phoenix Technology
Evlutionz LLC


  • Chatbox

    Load More
    You don't have permission to chat.
×
×
  • Create New...