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4" and 5" questions

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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4" and 5" questions

Unread postAuthor: Kobl » Mon Mar 12, 2007 5:47 pm

Does a 4" endcap fit in 5" pipe as a 3" cap fits in 4" pipe? I was also wondering if someone could give me a little mentoring (plz gort?) with my latest 5" tee 4" porting valve.

thanks,
Butt
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Unread postAuthor: VH_man » Mon Mar 12, 2007 5:50 pm

wered u get 5" pipe?
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Unread postAuthor: zeigs spud » Mon Mar 12, 2007 5:51 pm

VH_man wrote:wered u get 5" pipe?

dido, and i don't think any1 here really wants to mentor, unless they liek to type, alot....
re-search diffrn't cannon, go to hardware stores and see if things fit together...even if u don't buy it lol.
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Unread postAuthor: Kobl » Mon Mar 12, 2007 5:53 pm

For the 5" pipe, I'm currently looking into that. This cannon is gonna run off the funds from m birthday which is in a month or so, I'm just trying to get the parts list and plans together. As for the mentoring, bah, I just need some advice.

-Butt
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Unread postAuthor: jjk92 » Mon Mar 12, 2007 5:54 pm

i was talking to my dad(owns a contracting business works with pvc often) last night and was asking him about pipe and apperantly they dont make sch 40 pressure rated 5in pipe unless you get it off some website that specializes in things such as that (i would assume mcmaster)...because in the residential and industrial plumbing world there is nothing that uses sch 40-80 pressure rated 5in.....just a fyi
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Unread postAuthor: Kobl » Mon Mar 12, 2007 7:52 pm

*sigh* I guess I'll just build the valve in a 6" tee then.

-Butt
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Unread postAuthor: VH_man » Mon Mar 12, 2007 8:28 pm

6 inch pipe proboably isnt pressure rated either unless you buy it from mcmaster......... it will proboably end up being cheaper (and safer) to use metal pipe....... a 6inch stick of 6inch pressure rated pipe is around 1000 bucks........ (no joke). and i dont htink you can buy pressure rated 6inch tees. just stick with a 4inch tee valve (use pressure rated stuff!!!!!!!) and if you still want to a 6 inch chamber. unless you want to spend 10,000 on a spud gun.............
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Unread postAuthor: boilingleadbath » Tue Mar 13, 2007 4:04 pm

VH_man, try not to make yourself look ignorant.

Mcmaster carries <i>clear</i> 6" sch <i>80</i> (and sch 40 too) pipe for 360$ per <b>8' chunk</b>.

Their opaque stuff is significantly cheaper, not to mention rated to a higher pressure.

Furthermore, their 6" sch 80 tees are 44$.
(I wouldn't go with their 37$ sch 40 ones)

This valve project is quite practical, albeit a bit more expensive than normal.
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Unread postAuthor: Kobl » Tue Mar 13, 2007 4:35 pm

The only problem I can see with the valve is that I may need some custom machining done. I need the tee(s) bored out and possibly the hex part of some bushings lathed off. I also realized that 4" porting can in fact be achieved in a 4" tee. Just gotta think out side of zee box.

-Butt
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Unread postAuthor: TwitchTheAussie » Wed Mar 14, 2007 12:02 am

Indeed you do man. Lets hope you get it underway soon, Im dying for some pics :P
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Unread postAuthor: deusXmachina » Wed Mar 14, 2007 10:47 am

While we're on the topic of McMaster, it's an excellent resource for finding what fits in what because it usually gives ID and OD. That, plus a little sanding and you can usually custom make your own pistons and such with very little machining.

If you do have to take off more than 1/16th of an inch, if you can get a hold of a decently large electric motor (I have a 1/3 hp motor that I think coincidentally originated from a machine shop) and a pulley that has the same OD as the piece you are working on. Attach the pulley to the axle of the motor, and duct tape the piece to the pulley (make sure to tape it well because if it is imbalanced you don't want it flying off) and have at it with rasps, files, sandpaper whatever.
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Unread postAuthor: Kobl » Wed Mar 14, 2007 6:47 pm

Yeah... I'd rather send my parts to someone who has a precision lathe rather than ghetto rigging something thats probably going to take my arm off.

-Butt
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