Question about o-rings- URGENT!!!!

A place for general potato gun questions and discussions.
User avatar
JDP12
Staff Sergeant 5
Staff Sergeant 5
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm

Thu Sep 11, 2008 7:54 pm

I have to finish my t-shirt launcher TONIGHT and have a question about the o-ring i have in the back of the tee- this bushing will slide into the back and will be bolted into the tee so i can open it up for maintenance.

What i'm wondering is if the o-ring is too far down in the slot and won't form a good seal, so i need a reply fast.

Thanks

<img src="http://i157.photobucket.com/albums/t79/ ... 1221181126">
User avatar
blind909
Corporal 4
Corporal 4
Posts: 828
Joined: Thu Aug 02, 2007 6:06 pm
Location: Las Vegas, NV
Contact:

Thu Sep 11, 2008 8:01 pm

Nope, its not too far down, it should make an excelent seal :P. And good luck on your T-Shirt launcher.
<a href="http://www.danasoft.com"><img src="http://www.danasoft.com/citysign.jpg" border="0"></a><div>
THIS STATES WHERE YOU LIVE, NOT ME, IT SAYS WHERE YOU LIVE BASED ON YOUR IP ADRESS.
User avatar
homedepotpro
Specialist 4
Specialist 4
Posts: 443
Joined: Sun Nov 26, 2006 1:00 am

Thu Sep 11, 2008 10:07 pm

looks to me that is it too far in. it needs to extend to a larger diameter than that of your bushing. If not, it won't contact to socket your inserting it into and create a seal.
Image
User avatar
MrCrowley
Moderator
Moderator
Posts: 10078
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Been thanked: 3 times

Thu Sep 11, 2008 10:25 pm

Yeah, at the top of the picture it looks well below the bushing and will probably leak out there if so.
User avatar
frankrede
Sergeant Major 2
Sergeant Major 2
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Has thanked: 1 time
Been thanked: 1 time

Thu Sep 11, 2008 11:10 pm

blind909 wrote:Nope, its not too far down, it should make an excelent seal :P. And good luck on your T-Shirt launcher.
Blind909, have you ever even used a O-rings in such a purpose?
Current project: Afghanistan deployment
User avatar
Gippeto
First Sergeant 3
First Sergeant 3
Venezuela
Posts: 2504
Joined: Sat Jan 19, 2008 10:14 am
Location: Soon to be socialist shit hole.
Has thanked: 2 times
Been thanked: 17 times

Donating Members

Thu Sep 11, 2008 11:10 pm

I think your groove is too deep.

As it's going to be bolted in, you could try it as is first.

You might be able to fix it by putting several wraps of teflon tape in the groove under the o-ring.


Good luck.
"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
SpudUke5
Sergeant
Sergeant
Posts: 1099
Joined: Tue Sep 04, 2007 10:16 pm

Thu Sep 11, 2008 11:17 pm

I kindof have a question pertaining to this:

If the o ring is too big, (like in a o-ring grooved piston), how does it fit in the housing? (I encountered this problem alot with my o-ring attempted pistons).
4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
User avatar
MrCrowley
Moderator
Moderator
Posts: 10078
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Been thanked: 3 times

Thu Sep 11, 2008 11:19 pm

It's pretty much an art to get the o-ring groove perfect. You really need a lathe to get the depth exact, without a lathe you may need a mallet and a lot of lube :P
User avatar
frankrede
Sergeant Major 2
Sergeant Major 2
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Has thanked: 1 time
Been thanked: 1 time

Thu Sep 11, 2008 11:20 pm

Rubber is soft and it will squish down to fit and in turn create a better seal.
Current project: Afghanistan deployment
User avatar
JDP12
Staff Sergeant 5
Staff Sergeant 5
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm

Fri Sep 12, 2008 7:48 am

yea i'll add some teflon to it- turns out it got postponed so i have a couple more days to work on it.

what are some of the good lubes out there?

And this groove was cut with a drill :P So its not the perfect depth.... hahaha
User avatar
Brian the brain
Moderator
Moderator
Netherlands
Posts: 3497
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Been thanked: 7 times

Fri Sep 12, 2008 8:59 am

I've heard of lithium grease as being particularly good.
Post Reply