Jump to content


Photo

Brass Breech Problem


16 replies to this topic

#1 CROW

CROW

    Member

  • Members
  • 367 posts
  • Location:Poway, California 92064

Posted 12 June 2009 - 08:51 PM

Hey 'Haven. I'm building a breech with 17/32" and 9/16" brass. Each piece has a gap, and when the two slide far enough along each other, the gaps line up and theres a hole to put the dart in. What my problem is, is that the brass slides horribly. It takes enough force to slide the two that I doubt it will be worth having the breech on the gun. Any clues on how to solve this?

(I've made sure there are no points of contact between the two pieces. Is it possible that I just just a slightly oversized piece?)
  • 0
"You can discover what your enemy fears most by observing the means he uses to frighten you."

"ah man, I would give you so much for one of those NIB crossbows or one of those crossbows on the floor. The ones on ebay have gone up to $59 and the shipping alone is $12." -Rip32

#2 atomatron

atomatron

    Member

  • Members
  • 579 posts
  • Location:St. Paul Minnesota

Posted 12 June 2009 - 08:54 PM

Did they slide well before you cut them?

*EDIT*
Did you also clean up the inside of the cut on the 9/16th piece?

Edited by atomatron, 12 June 2009 - 08:57 PM.

  • 0
Perche Germolgi. [Because it shoots]

Rainbow Clan

#3 Zorns Lemma

Zorns Lemma

    Sir Scrt

  • Moderators
  • 1,277 posts
  • Location:Dulles International Airport
  • State:Virginia
  • Country:United States

Posted 12 June 2009 - 08:54 PM

Clean up your cuts and maybe clean the brass. I've found 17/32 to be tighter in 9/16 relative to the fit of 9/16 in 19/32, so any flares or glue on the brass is going to make life very difficult.
  • 0
"In short, the same knowledge that underlies the ability to produce correct judgement is also the knowledge that underlies the ability to recognize correct judgement. To lack the former is to be deficient in the latter."
Kruger and Dunning (1999)

#4 CROW

CROW

    Member

  • Members
  • 367 posts
  • Location:Poway, California 92064

Posted 12 June 2009 - 10:13 PM

To be honest, they didnt slide that well beforehand either. I'm starting to think that the pieces I got were just a little too small or a little too big. I'll probably end up redoing the breech with better pieces unfortunately...
  • 0
"You can discover what your enemy fears most by observing the means he uses to frighten you."

"ah man, I would give you so much for one of those NIB crossbows or one of those crossbows on the floor. The ones on ebay have gone up to $59 and the shipping alone is $12." -Rip32

#5 The Kart Racing Nerf Man

The Kart Racing Nerf Man

    Member

  • Members
  • 150 posts
  • Location:Rancho Sante Fe, CA

Posted 12 June 2009 - 11:06 PM

I had this same problem... I used very fine sandpaper and sanded the cuts that I made and most of the entire brass piece. Try it, it worked for me perfectly.

Edited by The Kart Racing Nerf Man, 12 June 2009 - 11:07 PM.

  • 0
I'm a Mac

Paste this into your sig if you are a Mac.


#6 pjotrkuh

pjotrkuh

    Member

  • Members
  • 259 posts
  • Location:'S-Hertogenbosch, The Netherlands
  • Country:Netherlands

Posted 13 June 2009 - 12:25 AM

Maybe (I could be mistaking) there is a weld line along the lenght of the tube on the inside, or the tubes are slightly bended when transported or cut.

Edited by pjotrkuh, 13 June 2009 - 12:26 AM.

  • 0
When the shit hits the fan, you'd better wear a rain coat.....

#7 jackster57

jackster57

    Member

  • Members
  • 436 posts
  • Location:Maine

Posted 13 June 2009 - 07:58 AM

I am not sure about you, but all of my brass comes with little stickers telling the size of the pipe. After I take off those stickers I have to be sure to completely sand off all of the residue or the brass has trouble sliding. Try that.
  • 0

#8 Lt Stefan

Lt Stefan

    Member

  • Members
  • 892 posts
  • Location:Hunterdon County, NJ
  • State:New Jersey
  • Country:United States

Posted 13 June 2009 - 11:01 AM

I am not sure about you, but all of my brass comes with little stickers telling the size of the pipe. After I take off those stickers I have to be sure to completely sand off all of the residue or the brass has trouble sliding. Try that.


Yes I would agree with that. Also, if the brass is old, tarnishing could be a problem. Or they might be slightly dented.
  • 0

#9 Possemhunter

Possemhunter

    Member

  • Members
  • 138 posts

Posted 13 June 2009 - 11:07 AM

If you use pipe cutters, there is a large flange left behind. File that off with a round file.. I prefer to use a dremmel to cut brass because it leaves less of a flange behind and is a zillion times quicker. You still have to file a bit though.
  • 0

#10 atomatron

atomatron

    Member

  • Members
  • 579 posts
  • Location:St. Paul Minnesota

Posted 13 June 2009 - 12:08 PM

I am not sure about you, but all of my brass comes with little stickers telling the size of the pipe. After I take off those stickers I have to be sure to completely sand off all of the residue or the brass has trouble sliding. Try that.

Wouldn't Goo-Gone also work?
  • 0
Perche Germolgi. [Because it shoots]

Rainbow Clan

#11 Lt Stefan

Lt Stefan

    Member

  • Members
  • 892 posts
  • Location:Hunterdon County, NJ
  • State:New Jersey
  • Country:United States

Posted 13 June 2009 - 12:48 PM

I am not sure about you, but all of my brass comes with little stickers telling the size of the pipe. After I take off those stickers I have to be sure to completely sand off all of the residue or the brass has trouble sliding. Try that.

Wouldn't Goo-Gone also work?


Lots of methods would work.
  • 0

#12 CROW

CROW

    Member

  • Members
  • 367 posts
  • Location:Poway, California 92064

Posted 13 June 2009 - 01:04 PM

I'll give a little sum up of what I've done: I've sanded both pieces with fine sandpaper until they were perfectly smooth, added silicon lubricant, filed the insides of ALL the edges of the larger, outer pipe, sanded all the outside edges of the smaller, internal pipe, and bent any cuts back into place. The damn breech still doesnt slide. I've done just about everything possible I think, so I'm heading back to the hobby store for more pipe and a rebuild.

Edited by CROW, 13 June 2009 - 01:04 PM.

  • 0
"You can discover what your enemy fears most by observing the means he uses to frighten you."

"ah man, I would give you so much for one of those NIB crossbows or one of those crossbows on the floor. The ones on ebay have gone up to $59 and the shipping alone is $12." -Rip32

#13 Wes7143

Wes7143

    Member

  • Members
  • 758 posts
  • Location:Maine
  • State:Maine
  • Country:United States

Posted 13 June 2009 - 01:30 PM

Valve oil. For use with brass trombones, preferably.
  • 0
QUOTE(VengefulWaffle)
Get off my boyfriend


If at first you don't succeed, add more epoxy.

#14 Merzlin

Merzlin

    Member

  • Members
  • 589 posts

Posted 13 June 2009 - 01:36 PM

I would have never thought of Valve Oil, and I play the trumpet! I have a couple bottles for all my brass instruments, I'll have to try that out.
  • 0

#15 SorrowX

SorrowX

    Member

  • Members
  • 162 posts
  • Location:Buena Park, southern Cali

Posted 13 June 2009 - 04:44 PM

Your brass and quite possibly your cuts aren't clean. You are going to need steel wool(Brillo Pad), paper towel, and a product called Brasso. First, use your steel wool and scrub your brass down, and put a bit of focus on your cuts. Now get a piece of paper towel and roll it up, then put a small amount of Brasso and run it through the inside of each one of your tubes. Then get another piece of paper towel and rub down the outside of each tube with a bit of Brasso. Then scrub down with the steel wool and rinse your tubes with water; they should slide very smoothly once they dry. I do this all the time with my brass, and I assure you, it has never failed me before. Hope this helped!

Edited by SorrowX, 14 June 2009 - 01:27 PM.

  • 0
You may have the balls, but I have the lack of morality!

#16 nerfnrg

nerfnrg

    Member

  • Members
  • 155 posts

Posted 13 June 2009 - 06:36 PM

If you want to try the Valve Oil thing, try using a Q-tip to do the inside of the 9/16 brass. For the 17/32, just squeeze a few drops and if that doesn't work, get a few bottles of valve oil and dunk them all in a cup. Then dunk the 17/32 into the cup. Well, I don't know if valve oil works but 2 other people suggested it so I'm just suggesting how to do it.

~nrg
  • 0
Snake51886~ "Beware everyone...t2 has openly admitted to fucking 14 year olds...."
VindictivePancake~ "i've seen hot 10 year olds" - T2heavy
t2hevey~ "yupp"

(\ /)
(='.'=) <--Me
(")_(")

#17 bobbybilly60

bobbybilly60

    Member

  • Members
  • 39 posts
  • Location:Chandler, Az 85225

Posted 14 June 2009 - 12:40 AM

Valve oil contains vasiline. It may ruin rubber that is in contact with it and all the stuff vasiline ruins.
  • 0
QUOTE
Hooah!


0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users