louiec3

Background

 

So in my incessant thrifting I came across a pair of Big Blasts and immediately had a great idea for one: I wanted to cleanly integrate a nice turret capable of rear loading.

One problem is that I have limited access to a machine shop, so I opted to do most of the build using 3-D printed parts.

The end result is a Big Blast reminiscent of Ryan McNumbers rear loading AT3ks

 

 

Materials

• 3-D Printer
• 3" 1/4-20 or 1/4-28 bolt
• 1/4" washer
• Nylon insert locknut for the 3" bolt
• Small strong spring-- I got mine in a spring assortment bag years ago
• 8 barrels of your choosing 5/8" OD I used some PETG 5/8" OD 1/2" ID CPVC works too, but I would bore it out so it's not so tight
• Marble-- Mine was from slingshot ammo and the OD is 0.540" so try to get one close to that
• Spring 9657K286-- I believe that is the part number
• 1/16" thick neoprene washer-- most hardware stores carry these
• Super Glue
• Amazing Goop

GrabCAD Files

 

Here is the link to the GrabCAD folder. There is a SolidWorks model of the whole turret, and .stl and .step files for the 3-D printed parts.

When you are printing these I found that the holes for the barrels in the base and spacer were not that accurate diameter-wise.

My solution was to print them close and use a 5/8" reamer to do the final sizing.

I would do a test print of the the spacer or part of the base, and then adjust the hole sizes as needed.

 

https://grabcad.com/...8-shot-turret-1

 

Write up

 

Building this is pretty self explanatory, and the pictures do a pretty good walk through, so I'll let them do most of the explanation.

• I used 7" barrels, but use whatever you want
• The turret will fit snugly in the shell, so be careful not to remove too much material.
• I super glued the barrels in place, but feel free to use whatever glue you want.
• Print the turret base so the junction to the BBBB tank is down then you should be able to avoid any supports in the internal air passage
• You can also do any other sort of mods you want i.e. pump relocation, trigger replacement...

 

For the turret base you will see better performance if you do some after treatment of the print such as a vapor bath. This will seal the layers together well, and prevent leakage from the internal air passage.

I used PLA which is not easy dissolve but I did a vapor treat using tetrahydrofuran. This stuff is nasty, if you aren't trained to work with it DO NOT!!!!

Another safer option is just to paint the internal passages with a durable enamel paint, like nail polish or modeling paints.

For ABS prints acetone is readily available (Nail polish remover) and not as dangerous, but still use caution. You could even just apply it to the internal walls of the air passage using a cotton-swab.

 

 

Finished Product

 

 

Questions, comments, concerns?

Habitat for Humanity

This July myself and 9 others from my high school are traveling to Waterloo, Iowa to help build a house with Habitat for Humanity.

In order to travel we obviously need to raise money. $200 to be exact. This will cover gas, food, housing, and other expenses we encounter along the trip.

I am reaching out to the NIC to help sponsor me on this trip to Iowa. I don't care if you can only give $1 or you decide to give me all $200, everything will help me reach the goal.

One of the chaperones, Mrs. Braier, created a sponsorship sheet to show to people, and since I can't send everyone here a copy I just scanned it in, so you can read what she wrote. I blanked out her phone number, but if you want to talk to her I can arrange it.



In order to donate I will just use my paypal account, and if you don't have paypal pm me, and I can send you my address to send money or checks too.
If you want me to mention your name in this post for a donation write a note in the paypal message.
I will close this thread on May 1.

* I have reached my goal of $200, and far beyond thanks to everyone who helped. Any donations received after March 14 will be donated directly to habitat during the trip in July.

My Paypal

Louiec3@wi.rr.com

List of Donations

$10 Anonymous
Ambience 327
$30 Anonymous
$15 Anonymous
$400 Anonymous

FAQ

Are the donations Tax Deductible?

-Yes they are, and I can get receipts for those who need them.

What is the Official Club/Organization at the high School, so I can donate to a recognized charity?

-I know checks, if you write them, are made out to South Milwaukee High School. Since the funds are being used for our travel exspenses it is not an official charity.

If for any reason you want to learn more about my trip or habitat for humanity just ask, so I can find more information for you.

One final note. If someone goes above and beyond in their donation, I will make sure they benefit from their generosity.

Saturday November 13, 2010 10-5 or whenever we freeze.

Same place it was last time.

Obviously this is in Wisconsin, and the park is pretty simple to get to.

Just take the College avenue exit on I-94 eastbound until you hit lake drive in South Milwaukee.
Then take the first left into the park and follow that road to the parking lot.




Do not use the park address since that will not take you to the right place. If you want an address that is close use

200 Lake Dr, South Milwaukee, Milwaukee, Wisconsin 53172

Rules:
- Don't be a douche
-slugs or stock ammo
-If you act like a 3 year old I will treat you like a 3 year old and you will leave.
-You must help with clean up, and dart sweeps
-Big ammo is encouraged
-Label your items
-Skinny jeans on anyone without two x chromosomes is banned





Here's what to bring:
- Nerf Blasters and backups in case of breakage
- Eye Protection, or else you won't be able to play
- Ammo
- Lunch and Drinks, We'll have time for lunch and then back to Nerf. If you're late, we're starting without you.

Banned Guns:

-None but If I feel that something is overpowered and killing all the fun I will spot ban it. This applies to anything not just guns.
-Big blasts. don't even think of using one. I don't care if it is bone stock.
-homemade clips hoppers,rscbs, and inlines.



Time Frame
Saturday November 13

10:00 am to 5:00pm- Be there early so we don't have to wait for you to set up.

Lunch will be around 12:30ish There is a KFC, Taco Bell, Arbys, and Mcdonalds in a short driving distance.

We will do dart sweeps when we run low on ammo.

Rounds will be what ever I decide to do, but we will start off with some sort of Team Death Match or Meatgrinder.

Plan on playing

-TDM
-CTF
-VIP
-King
-Freeze Tag
-offend the core
-attack defend

and others if people suggest.


Other Stuff

-We need some mobstacles If no one can bring them I will go and make some.
-You must clean up after yourself.
-If anyone has a megaphone that would be useful.
- Bring me streamlines


Attendance

-Me, and people. If you want a running count don't ask me.

I did this for Nerfer9 on Nerfhaven.

I took pictures of everything after it was made so there aren't pictures in progress. This is how I'm doing all of my crossbows form now on. (minus the integration)

Materials
-1 1/4 od 1 1/8 id polycarbonate tube
-1/4 polycarbonate
-3/8 pvc rod
-2 1" fender washers
-5/8 pvc rod
-[k26] spring
-materials for a priming handle
-9562K44
-2k and pump
-1/8 tubing id barbed fitting
-1/8" id 1/4" od tubing
- pvc cement/ MEK
-probably more stuff

Cut open your crossbow, and reinforce the spring rest, and any weakening screw ports with e-putty.


Make those polycarbonate pieces. The squares are all 1 3/8" and the circles in the squares are 1 1/4".
Also make two 2" by 3/8" rectangles out of polycarbonate.

Lucian is coming to save the day with templates!


Cut your plungertube to 8.75" and goop a coupler in. Also use pvc cement to attach the square with the circle and no slot to it.


IF you can see this is where you pvc cement the rectangles in.

Cement the last to squares together so the slots line up then cement it in your shell. You can also see where I screwed it in too.




Cut your pvc rod to 13" (this length includes the handle) The notch is about 3.5" from the end.
The [k26] is 7" long.
The plunger head is the 2 washers the skirt and a chunk of 5/8 pvc in the skirt centering it. (the pvc has a hole drilled in it).
As you can see the polycarbonate circle is on it too.

Cut a chunk of 3/4 pvc and glue it in your trigger.


Now for the integration. Take your 2k tank and pump, take out the old tubing and secure the 1/4" od tubing in them. I used pvc cement.
diddle the shell in the right places for them, and secure them down. If you use hotglue pump air through the system while it cools so you don't fry your o-rings.



I couplered the tank, and secured it down with more pvc cement. The endcap on the pump acts to keep the pump steady, and to prevent it from flying out. Don't forget to attach a key-ring trigger to this.

This is the first War I am hosting solo, and I have big plans.


Sunday September 12th 10:00am to 5:00pm


Obviously this is in Wisconsin, and the park is pretty simple to get to.

Just take the College avenue exit on I-94 eastbound until you hit lake drive in South Milwaukee.
Then take the first left into the park and follow that road to the parking lot.
From the parking lot it is a short 50ft walk to the pavilion I have reserved.




Do not use the park address since that will not take you to the right place. If you want an address that is close use

200 Lake Dr, South Milwaukee, Milwaukee, Wisconsin 53172

Rules:
- Don't be a douche
- Stock ammo only
-If you act like a 3 year old I will treat you like a 3 year old and you will leave.
-Be mature this is my home town, and if you make me look bad I will not hesitate to slip some slingshot weights in a +bow in your general direction.
-You must help with clean up, and dart sweeps
-Big ammo is encouraged
-Label your items
-skinny jeans on anyone without two x chromosomes is banned



Here's what to bring:
- Nerf Blasters and backups in case of breakage
- Eye Protection, or else you won't be able to play
- Ammo, we've got an awesome communal box going, but be sure to bring your own
- Lunch and Drinks, We'll have time for lunch and then back to Nerf. If you're late, we're starting without you.

Banned Guns:

-None but If I feel that something is overpowered and killing all the fun I will spot ban it.


Time Frame
Sunday September 12th

10:00 am to 5:00pm- Be there early so we don't have to wait for you to set up.

Lunch will be around 12:30ish There is a KFC, Taco Bell, Arbys, and Mcdonalds in a short driving distance.

We will do dart sweeps when we run low on ammo.

Rounds will be what ever I decide to do, but we will start off with some sort of Team Death Match or Meatgrinder.

Plan on playing

-TDM
-CTF
-VIP
-King
-Freeze Tag
-offend the core
-attack defend

and others if people suggest.


Other Stuff

-We need some mobstacles If no one can bring them I will go and make some.
-Bring darts preferably streamlines since everyone can use them.
-Hydrate at the war. I will have water and some gatorade, but bring your own I don't want anyone leaving with heat stroke
-You must clean up after yourself.

-I won't charge an admission fee to nerf with us, but donations will help a lot. It doesn't have to be money you can just add darts to the dart bucket.



Attendance

-Me and many others




I will get some pictures soon.