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Short question topic

A place to ask general spud cannon related questions.
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Unread postAuthor: Goats spudz » Fri May 11, 2012 12:23 pm

i need the exact thread dimensions as its critical it seals and it will be used at high pressure, i know its a non commercial tap size so ill set the lathe for internal threading,
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Unread postAuthor: Petitlu » Fri May 11, 2012 12:24 pm

1/2 BSP !

I have already used!
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Unread postAuthor: jackssmirkingrevenge » Fri May 11, 2012 12:52 pm

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Unread postAuthor: Gun Freak » Fri May 11, 2012 5:14 pm

First result
But as said above, it fits 1/2" BSP.
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Unread postAuthor: Goats spudz » Fri May 11, 2012 5:54 pm

Gun Freak wrote:First result
But as said above, it fits 1/2" BSP.
I want the reg output, not the tank
threads which are 5/8" UNF and actually its 3/8" BSP that fits, JSR kindly gave me that link which has a 1/2" NPS tap but i found one at work, and will be machining them soon, i didn't want to use "similar" threads because it will be used at 800-1500 psi.
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Unread postAuthor: Gun Freak » Mon May 14, 2012 3:31 pm

It's 1/4"-14, make sure your tap matches in TPI.
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Unread postAuthor: Goats spudz » Mon May 14, 2012 3:49 pm

Im getting a Machinist to make it on the Hurco cnc, will post pictures in this thread tomorrow.
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Unread postAuthor: MrCrowley » Wed May 16, 2012 11:48 pm

Since my piston hybrid requires a dozen hits from a mini-sledge hammer to seat the piston, I was thinking about buying a small (30mm diameter piston) pneumatic cylinder that will push the piston in to place and then be disconnected when the cannon is fired.

Thoughts?
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Unread postAuthor: Crna Legija » Thu May 17, 2012 1:08 am

MrCrowley wrote:Since my piston hybrid requires a dozen hits from a mini-sledge hammer to seat the piston, I was thinking about buying a small (30mm diameter piston) pneumatic cylinder that will push the piston in to place and then be disconnected when the cannon is fired.

Thoughts?


why is it so tight? i'm guessing its the only way you could make it air tight.
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Unread postAuthor: MrCrowley » Thu May 17, 2012 1:14 am

I epoxied the o-rings in to the grooves as I couldn't get washers that were the perfect diameter for the piston housing so it was possible for the o-rings to get ripped out of their grooves. Performance is probably better than before so I don't mind it too much.
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Unread postAuthor: jackssmirkingrevenge » Thu May 17, 2012 3:29 am

MrCrowley wrote:I epoxied the o-rings in to the grooves as I couldn't get washers that were the perfect diameter for the piston housing so it was possible for the o-rings to get ripped out of their grooves. Performance is probably better than before so I don't mind it too much.


Get someone to machine you a proper piston and get o-rings to fit?
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Unread postAuthor: MrCrowley » Thu May 17, 2012 5:09 am

The o-rings fit perfectly, the problem is the washer is probably 1.5mm smaller in diameter than it should be so the o-rings only have a small 'wall' on either side to hold them in place.

Been tempted to get one made but don't want to sink the money and effort and trying to explain to some Kiwi bloke why I need this metal stock to be cut in to a piston with two o-ring groves allowing it to seal and slide within this iron pipe with the seam removed.
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Unread postAuthor: DYI » Thu May 17, 2012 7:26 am

Gee, here I am machining pistons to within 0.001" of the bore diameter to prevent extrusion of the o-rings when I could have just used washers and gratuitous amounts of epoxy...

I have no sympathy for you at all :lol:
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Unread postAuthor: mark.f » Thu May 17, 2012 7:49 am

MrCrowley wrote:Been tempted to get one made but don't want to sink the money and effort and trying to explain to some Kiwi bloke why I need this metal stock to be cut in to a piston with two o-ring groves allowing it to seal and slide within this iron pipe with the seam removed.


Just give him a drawing with "Piston" at the top. :roll:
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Unread postAuthor: warhead052 » Thu May 17, 2012 10:26 am

MrCrowley wrote:Been tempted to get one made but don't want to sink the money and effort and trying to explain to some Kiwi bloke why I need this metal stock to be cut in to a piston with two o-ring groves allowing it to seal and slide within this iron pipe with the seam removed.


Easy, just say its for a homemade water hammer, you've been having problems with the hammer effect, and that the others you have looked for online cost too much with shipping. And if that doesn't cut it, well go with Mark's plan.
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