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Question about o-rings- URGENT!!!!

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Question about o-rings- URGENT!!!!

Unread postAuthor: JDP12 » 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/justhavinagoodtime/DSC00255.jpg?t=1221181126">
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Unread postAuthor: blind909 » 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.
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Unread postAuthor: homedepotpro » 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.
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Unread postAuthor: MrCrowley » 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.
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Unread postAuthor: frankrede » 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?
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Unread postAuthor: Gippeto » 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.
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Unread postAuthor: LikimysCrotchus5 » 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).
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Unread postAuthor: MrCrowley » 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
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Unread postAuthor: frankrede » Thu Sep 11, 2008 11:20 pm

Rubber is soft and it will squish down to fit and in turn create a better seal.
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Unread postAuthor: JDP12 » 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
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Unread postAuthor: Brian the brain » Fri Sep 12, 2008 8:59 am

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