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Sketchup Model Library

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Technician1002 » Wed Sep 23, 2009 12:45 pm

dewey-1 wrote:@Tech;

My models are more realistic than your memory! :D :D :D

Where should I post the 1 inch QDV?

Do you want it in this posting and the sketchup library?


The locations sound great. I'm sure others will be interested in the fine details. I'm glad you found the exact tank so you got the model correct.
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Unread postAuthor: dewey-1 » Fri Sep 25, 2009 11:46 am

This will be added to he library once Tech approves dimensions.

Edit; removed attachment.
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Last edited by dewey-1 on Fri Sep 25, 2009 2:33 pm, edited 1 time in total.
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Unread postAuthor: Technician1002 » Fri Sep 25, 2009 12:03 pm

dewey-1 wrote:This will be added to he library once Tech approves dimensions.


I am glad you requested verification. The flat end is the breech end. The rounded end and the end with the recess are the same end, the muzzle end. Other than that minor detail, it's fantastic.

The bevel is to narrow the edge between the ring and end of piston and provide a smooth transition from the chamber to the barrel.
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Attachments
ValveDetail1.jpg
Piston detail showing orientations. The bent pin is on the end of the rod for larger surface area for pulling the piston open.
ValveDetail1.jpg (35.79 KiB) Viewed 1518 times
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Unread postAuthor: dewey-1 » Fri Sep 25, 2009 2:31 pm

Here is the revised drawing.
The previous one will be deleted to prevent confusion.
This is a 2D version (top view). Use for accurate dimensions.

Tech can give approval.
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QDV-1-PISTON.PNG
Revised; QDV 1 inch Piston HDPE
QDV-1-PISTON.PNG (20.77 KiB) Viewed 1501 times
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Unread postAuthor: Technician1002 » Fri Sep 25, 2009 2:51 pm

Very nice. It looks just like it. Well done.
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Unread postAuthor: POLAND_SPUD » Fri Sep 25, 2009 3:04 pm

kudozz...
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unless we stop them now
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Unread postAuthor: dewey-1 » Fri Sep 25, 2009 5:41 pm

Thanks Tech & Poland Spud;

Here is another preliminary drawing.
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QDV-PRELIM.PNG
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Unread postAuthor: Technician1002 » Fri Sep 25, 2009 6:15 pm

dewey-1 wrote:Thanks Tech & Poland Spud;

Here is another preliminary drawing.


I am very impressed. One comment on the tank. I wanted everything serviceable without cutting. The Schrader is only a 1/4 inch close nipple. The schrader or quick connect for rapid fire is screwed onto the nipple.
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Attachments
Bottle Luancher.JPG
Tank with schrader screwed on with the bottle rocket barrel. Makes a quick fill from the compressor simple and can be fired without a connected hose.
WikiTank.jpg
Tank with quick connect for the hand pump. It's hard to hand pump and hold the connection at the same time.
Tennis ball barrel2.jpg
Typical field use with hand pump to prevent the air chuck from blowing off. I used a quick connect instead.
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Unread postAuthor: dewey-1 » Fri Sep 25, 2009 6:58 pm

That can done!

1/4" nipple brazed/welded.

The disconnect, is it ARO or Industrial?

I could put a 3/8 to 1/4 hex bushing in, then it is completely changeable to any combinations. It can be Schrader or any disconnect the builder wants.

Seem like a better option to me.
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Unread postAuthor: Technician1002 » Fri Sep 25, 2009 7:47 pm

dewey-1 wrote:That can done!

1/4" nipple brazed/welded.

The disconnect, is it ARO or Industrial?

I could put a 3/8 to 1/4 hex bushing in, then it is completely changeable to any combinations. It can be Schrader or any disconnect the builder wants.

Seem like a better option to me.


The coupling is industrial. You could put in a bushing, but the original is simply a galvanized 1/4 inch pipe nipple. Well it was galvanized until I got it to brazing temperature. :D

The schrader is simply a tire valve with the rubber cut down some and then put in a brass 1/4 inch pipe cap and screwed on. With the rubber, no tape or other sealer is needed.

When I went to Arlington with the full size, they used another coupler so using their compressor was a mater of simply borrowing a fitting to fit. I later bought one. They are under $2 for the male. I keep a selection in my bag for traveling.
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Attachments
Fill valve finished.JPG
Fill valve
Fill valve installed.JPG
Fill valve installed on the large launcher. Both launcher fill pipes are the same. The valves are interchangeable..
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Unread postAuthor: Technician1002 » Thu Oct 01, 2009 7:06 pm

I took the fill valve measurements. See photo. The tire valve was turned down in a drill press to fit the hole in the cap. I left a shoulder on the valve just small enough to fit inside the 1/4 inch cap with a little pushing. The shoulder is only about 1/8th inch long. The rubber was trimmed flush with the end of the brass tube inside the rubber. The brass tube overall length is in the picture. This rubber shoulder provides a seal on the 1/4 inch pipe nipple without requiring any Teflon tape on the threads. It screws on airtight.

I bumped this so dewey would get the measurements for his library.
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Fill valve measurements.JPG
Fill valve measurements.
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Unread postAuthor: dewey-1 » Mon Oct 12, 2009 2:47 pm

Here are some 14.1 ounce cylinders for: Propane, Oxygen, Mapp

If other file formats wanted just ask.

Image
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Unread postAuthor: Moonbogg » Mon Oct 12, 2009 5:38 pm

dewey-1 wrote:Here are some 14.1 ounce cylinders for: Propane, Oxygen, Mapp

If other file formats wanted just ask.

Image


Whoa, those are awesome. They beat the hell out of the dummy models I faked in. Those could be used for some sick renderings.
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Unread postAuthor: dewey-1 » Mon Oct 12, 2009 6:22 pm

Moonbogg wrote:
dewey-1 wrote:Here are some 14.1 ounce cylinders for: Propane, Oxygen, Mapp

If other file formats wanted just ask.



Whoa, those are awesome. They beat the hell out of the dummy models I faked in. Those could be used for some sick renderings.


Thanks. I try to model as close as possible to the real thing.
Damn near wear out my dal calipers with all these models!

I will e-mail you the sat files later.
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Unread postAuthor: dewey-1 » Wed Oct 21, 2009 1:14 pm

Here is a tire valve stem TR 413 for those of you that use this type.

The modified one is Tech's version. 3/8 inch hole in 1/4 inch brass cap.
The rubber is trimmed to fit cap thus giving it a compression seal when tightened onto pipe/fitting.

I will be adding other types later. (Metal Clamping Type TR 416B)



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