Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 68 users online :: 4 registered, 0 hidden and 64 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], D_Hall, Google [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

makeing threaded female/male pvc attachments screw flush

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

makeing threaded female/male pvc attachments screw flush

Unread postAuthor: pyromanic13 » Fri Sep 07, 2007 9:45 pm

does anyone have an idea of how to make 3" male/female threaded couplers (I think thats the right name) screw together flush? presently they only screw together about half way

-thanks
  • 0

Movie dialogue: "The good die first."
Tom: "But most of us are morally ambiguous, which explains our random dying
patterns."

pyromanic13
Brigadier General
Brigadier General
 
Posts: 913
Joined: Wed Oct 19, 2005 7:54 pm
Reputation: 0

Unread postAuthor: singularity » Fri Sep 07, 2007 9:58 pm

well i seem to ave the same problem with just about every type of pvc threaded fitting, it appears to be pretty normal. every once and a while i get a fitting that is perfectly flush (about one out of ten) it seems to do with what manufacture makes them. so if the fittings don't screw in all the way in a dry fit it is unlikely they will at any other time (always test when your at the store buying them, try to find the best one). there is only one thing i can think off... not sure how safe it is, well... if it on a combustion it should be fine. anyway my friend thought of this and has preformed it successfully twice (with lots of help). basically what you want to do is stick the female fitting in boiling water until it becomes soft, then quickly remove it from the water and screw in the male fitting as far as humanly possible. not comes the hard part after the pvc you boiled has hardened you need to unscrew it, which requires a lot of effort (like multiple people and a huge pair of pliers) i personally have not done it becuase i don't think its worth the effort.
  • 0

be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
User avatar
singularity
Brigadier General
Brigadier General
 
Posts: 982
Joined: Mon Jun 26, 2006 10:53 pm
Location: someplace
Reputation: 0

Unread postAuthor: Hubb » Fri Sep 07, 2007 10:07 pm

Maybe try this and add some type of lubricant to the threads to aid in removing the two fittings.
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: chartreusesnot » Fri Sep 07, 2007 10:19 pm

Teflon tape works well. I severely doubt that having the threads crap out halfway is a problem.
  • 0

_Fnord wrote:OMG you have broked teh universe!!!11exclamationpoint!1!

http://www.youtube.com/watch?v=UnKN7LXqizw
http://www.youtube.com/watch?v=oVm_3eEPEgM
http://www.youtube.com/watch?v=wLNjMSGxp00
^^^^CLICK^^^^
User avatar
chartreusesnot
Staff Sergeant
Staff Sergeant
 
Posts: 109
Joined: Tue Jun 05, 2007 11:52 pm
Reputation: 0

Unread postAuthor: trae08 » Fri Sep 07, 2007 10:21 pm

cut half of the male threads off then screw it back on. should go on all the way then
  • 0

Marvin the Martian: Where's the kaboom? There was supposed to be an earth-shattering kaboom!

Marvin the Martian: The Earth? Oh, the Earth will be gone in just a few seconds.

PCGUY wrote:Congrats, your the first donating member I have had to ban.
User avatar
trae08
Donating Member
Donating Member
 
Posts: 520
Joined: Sun Jul 09, 2006 2:14 pm
Location: florida
Reputation: 0

Unread postAuthor: rednecktatertosser » Fri Sep 07, 2007 11:09 pm

the reason is that pipe threads have a slight taper to them and are wider twords the back than they are at the front.
  • 0

"When you tell some body something, it depends on which part of these United States your standing in, as to how dumb you sound."
-Burt Reynolds as: Bo "Bandit" Darville
User avatar
rednecktatertosser
Colonel
Colonel
 
Posts: 590
Joined: Tue May 22, 2007 7:52 pm
Reputation: 0

Unread postAuthor: pyrogeek » Fri Sep 07, 2007 11:37 pm

If you cut the male fitting back, and filed the threads down, would that work? It would require a 60 degree file and a hell of a lot of time though...or access to a lathe set up for cutting threads.
  • 0

I'm weird, I know it, you don't need to tell me.

pyrogeek
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 457
Joined: Sat May 13, 2006 7:43 pm
Location: moline Illinios
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: frankrede » Fri Sep 07, 2007 11:43 pm

the threads are tapered so its going to be tough to do what you want.
  • 0

Current project: Afghanistan deployment
User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Unread postAuthor: pyrogeek » Fri Sep 07, 2007 11:47 pm

Not so. With a machine lathe, it would just take a little setup. You rotate your piece until the threads start where your tool is, note where the threading dial is, and engage the clutch on the cross feed when it gets there. Then the tool moves along and cuts right in the threads like it's supposed to. I've threaded a couple screws for C-clamps doing that.

As for the taper, you just adjust your headstock. Keep it dead on centered for threading normal stuff, or ofset it to get pipe threads. Of course, you need to use a tool cut to 60 degrees and follow the same procedure as mentioned earlier.

And that is all I ever really learned in high school. Or at least all I can ever see actually using.
  • 0

I'm weird, I know it, you don't need to tell me.

pyrogeek
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 457
Joined: Sat May 13, 2006 7:43 pm
Location: moline Illinios
Reputation: 0

Unread postAuthor: clide » Sat Sep 08, 2007 12:31 am

They aren't meant to screw together flush, and trying to force them to would be a good way to bust the female adapter. But if you need them to be flush for a design then you would need to modify the threads like the others have suggested.
  • 0


clide
Donating Member
Donating Member
 
Posts: 785
Joined: Sun Mar 06, 2005 3:06 am
Location: Oklahoma, USA
Reputation: 0

Unread postAuthor: pyromanic13 » Sat Sep 08, 2007 11:19 am

the problem is the two fittings are dwv, and will be holding sustained pressure... I was pitting on haveing a double wall thickness...

mcmaster is gonna cost me about 30$ for the six new fittings I'll have to buy, fork!
  • 0

Movie dialogue: "The good die first."
Tom: "But most of us are morally ambiguous, which explains our random dying
patterns."

pyromanic13
Brigadier General
Brigadier General
 
Posts: 913
Joined: Wed Oct 19, 2005 7:54 pm
Reputation: 0

Unread postAuthor: dongfang » Sat Sep 08, 2007 11:53 am

Hi,

Screw them together well tight (not too much, that will just introduce stresses and make the result weaker), then carefully measure the space between the two. Cut a ring of some pipe to the right length, and epoxy it over the male.
Cut another ring of a smaller pipe (find a way to take to calculate the length) and epoxy that into the female.

Epoxy mess can be removed immediately with alcohol.

Use teflon tape for final assembly.

Regards
Soren
  • 0

User avatar
dongfang
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 448
Joined: Sun Aug 27, 2006 8:02 am
Location: Switzerland
Reputation: 0

Unread postAuthor: sjog » Thu Sep 13, 2007 8:16 pm

dongfang
I'm going to remember that trick!!
Much cleaner that way.
  • 0


sjog
Donating Member
Donating Member
 
Posts: 440
Joined: Sun Oct 15, 2006 9:43 pm
Location: Marthas Vineyard
Reputation: 0

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], D_Hall, Google [Bot], Yahoo [Bot]

Reputation System ©'