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Spud's Internal PVC Tee Catch Design

For the homade Contest

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#1 Spud Spudoni

Spud Spudoni

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Posted 21 August 2011 - 04:40 PM

Alright, now to start off, I would like to thank Inferno for his very detailed pump action snap with tee coupler catch design, and Setro for his americanized coupler catch design. Also, Sgnerf for the original design.

Flaws in the original design:

-Limited to a vertical peice of PVC as your handle.
-Unsigtly tee jutting out of your blaster
-Parts of a shotgunned version would be seperated


In this design, I fix all of these problems.

Here is some of my original sketches for the design:
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Materials for the catch system:
-3/4 in PVC Tee
-2 #8? Finishing washers
-3/4 in CPVC
-1/2 in CPVC
-Small Home Depot Spring (Exact sizes in the writeup)
-washer in the catch (Exact sizes in the writeup)
-E-Tape
-Super Glue
-cut down 10-24x1 1/2 Bolt
-Dremel of any type with a cone shaped diamond sanding bit and metal cutting bit
-Drill with drill Bits
-8x1/2 screws (to bolt it in place)
-3/4 in PVC
-Epoxy Putty
-1 1/4 in PVC Coupler
-metal Angle Bracket
1 1/4 in PVC



Now to start, The only way to make the catch not jet out of the back of the Snap, is to make it internal. I have found that the bottom of the tee is not neccessary. Only the ridge on the inside of the fitting is.

First, grab your 3/4 inch PVC Tee
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Then cut the Tee down. This part really doesn't matter. Just cut it down so it esaier to sand later.
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From here, sand the tee down so it fits nicely in the 1 1/4 in PC. You may have to sand the the middle of the coupler down. It doesn't matter as long as you have the two end sections have the lip still. It is also important to sand the inside ot the tee so that the catch ring fits, as well as the plastic bit that is on the side of the tee. It will not fit unless this is sanded down.
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Here is the Tee being test fit inside the PC.
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Next, the internal parts of catch needs to be made. By using previous writup, cut your 3/4 inch PVC to the length of the Tee. Then cut a 1/2 inch section off for the catch ring. Then cut the excess in half for the two supporting ends. The purpose of these is to keep the Plunger rod in position, and to keep the catch ring from moving too much.
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For the catch ring supports, wrap them in E-tape and fit them into both ends of the tee. Super glue them in place.
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Now for creating the catch ring setup.
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First, cut your 10-24x1 1/2 Bolt to about 2 cm.
For the washer, I used a washer with the OD of 1'', and the ID that is a little less than 5/16''.
For the spring, I used a spring in Home Depot's Assorted Spring Kit. The product number is #471864. The spring length is 13/16''. The diameter is about 1 cm. The spring needs to be cut down to between 8/16 and 9/16''. I used a bolt with a triangular shaped head. Your spring size may vary according to what type of screw you use.
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I then took a #8? finishing washer, flipped it upside down, and glued it to the washer using super glue. The purpose of this is to keep the spring from moving around on the washer.
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To help with this process, I used another finishing washer and placed it on the bolt head to keep the spring from slipping off the catch. Now just drill a centered hole through the CPVC and place the assembly on this. You may have to super glue the bolt to the CPVC for stability.
Again, here it is assembled:
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Test fit the Catch in your tee. If it fits and the wacher is stable, then you have done something right.
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Now in order to use this, you must make a sizable hole in the blaster in order to make sure that the catch can be released.
Once you have found the place you want you catch put in, mark a line on the PC from the center line inside of the tee.
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I then drilled a 7/32 hole in the PC where I wanted the catch to be located. A higher caliber drill bit would be ideal, but that was the highest I had at hand. From there. take your diamond cutting cone bit on your dremel, and dremel out the PC until you can fit your catch ring in place.
From this:
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To this:
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Test fit the tee
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Fit the catch ring in place:
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In order to use this blaster, you must have an internal Trigger to fire it. I used a modified version of BoltSniper's PVC handle. It is angled, and is attached to half of a 1 and 1/4'' PVC coupler using Epoxy Putty.
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I then drilled a hole in the center of the Coupler that would fit over the bolt in the catch.
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Now test fit the handle on the PC.
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#2 Spud Spudoni

Spud Spudoni

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Posted 21 August 2011 - 04:41 PM

Although I have no pictures of it, I cut a dash into the front of the handle and slid a metal angle bracket into the handle. Once the angle bracket is on top of bolt in the catch ring, screw the bracket into the Snap loosley to allow it to move.
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How the Angle bracket is placed on bolt:
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Well, that is pretty much it. Nothing much else to it. The catch seems well secured and the catch is very hard to release. However, with the help of the lever action from the trigger, this will be very easy to do.
I used two Home Depot springs and a neoprene washer setup for my pull back Snap. Ranges and firing test are in the video.

[/Youtube][/Youtube]

I would love some feedback guys! Thanks for checking it out!
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industrial designer


#3 ChaosPropel

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Posted 21 August 2011 - 05:56 PM

Very nice, Spud! One of the things I've always disliked about ring catch blasters is the fact that they need a tee, which makes designing the handle/blaster really awkward. I love how the handle completely covers the catch area. :)
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Preheat oven to 350 degrees F (175 degrees C).


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