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Member Since 17 Feb 2006
Offline Last Active Today, 07:49 AM

#359549 Caliburn: Mag-fed Pump-action Springer

Posted by CaptainSlug on 28 April 2017 - 10:00 PM

Sure, you can be my huckleberry. I already sent the long-form reply to you on Reddit.
In other news, my spin-casting equipment is done.

CaptainSlug would this be okay as my first homemade. I have a smaller end 3d printer. How big is the largest peice.
A little backloged ATM but by the end of summer I should be able to have my very own homemade. So happy!

The largest parts are the mag well (5.023 x 4.281 x 1.75 inches) and foregrip (4.22 x 3.19 x 1.875 inches). The mag well is the only part that needs any support material, and it only needs a little bit on one side. I couldn't put a 45-degree angle on the part near the trigger guard without making the part either uglier, or potentially more difficult to make a mold for.
The "construction" process will involve drilling a few holes, pulling out some support material, cutting some tubes, threaded rods, and 16ga nails to length, then just general assembly. It's really easy to put together once you have all the parts. This is the first homemade blaster that I will feel comfortable shipping as a loose set of parts for the end-user to assemble themselves.
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#359541 Caliburn: Mag-fed Pump-action Springer

Posted by CaptainSlug on 28 April 2017 - 06:16 PM

Has it exploded from the plunger firing? Does it show signs of exploding?

Doesn't seem to be showing any signs of wanting to explode after a dozen dry fires. Making the bolt and the front of the plunger tube EXTRA THICK and printing both at 100% infill seems to have fixed the structural issues. It also made assembly a bit easier.

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#359504 High Cap Magazine Collective Brain-Spew

Posted by CaptainSlug on 27 April 2017 - 11:42 AM

I have no idea. But I suspect 22 darts is likely to be the ceiling of being reasonable in terms of mag dimensions and spring load.
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#359483 Caliburn: Mag-fed Pump-action Springer

Posted by CaptainSlug on 26 April 2017 - 02:27 PM

Image dump. No big issues with assembly so far. A few spots that I had to file down will be modified in the STLs before I make them available. I'll do final assembly and test the catch tomorrow.

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#359341 What was the first known homemade?

Posted by CaptainSlug on 20 April 2017 - 12:02 PM

All the early homemade discussion was at NerfHQ, not here. So all of that information is largely lost.


Zero made some of the first war-usable homemades, but everything at that time was typically air-powered and it was pretty rare that their use was allowed. The SNAP series is pretty much the genesis of allowing homemades at Nerf Wars.

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#359260 THIS one simple design will have you in TEARS...

Posted by CaptainSlug on 15 April 2017 - 09:40 AM

I have one designed but will do the initial prototype through machining.


AND I'm going to break my usual habits a bit and make it entirely out of PVC. So screws will be used sparingly and some of the assemblies will just get glued together.

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#359231 THIS one simple design will have you in TEARS...

Posted by CaptainSlug on 14 April 2017 - 09:31 AM

Double-post of mechanical sexiness.


The trigger and magazine release share the same spring, and the same pivot point.


This means that the trigger guard itself is the magazine release. To drop the mag you just push your trigger finger forward inside the trigger well.

This is exceptionally novel and the only thing I can think of that's similar is the ring trigger on early revolvers that were used to index the cylinder.

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#359152 Caliburn: Mag-fed Pump-action Springer

Posted by CaptainSlug on 10 April 2017 - 07:05 PM

No progress today. Didn't have time or opportunity at work to use the oven, which shares an outlet with a chiller that is tied to a vacuum weld chamber.


Do you think you could put a k14 in this?

No. You would have to make almost all of the blaster pats out of much higher grade materials. I'm not interested in entertaining springs that nobody can actually prime. Especially when this blaster already hits 210 fps.


Although, on a related note I did just find a casting epoxy that's 90% of the strength of polycarbonate when cured.

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#359056 Replacing broken/ripped O-Rings

Posted by CaptainSlug on 06 April 2017 - 08:27 AM

I wrote this out to answer this question elsewhere and thought it might be good to store it here.


IF you break/rip/tear and O-Ring and you need to find a replacement for it, here's how you can do so.


1. Use a ruler to measure the length of the broken o-ring piece inside of the curve.

2. Use that length with this calculator set to "Given C"  http://www.calculato...lane/circle.php

3. Write that number down as you now have the actual ID of the O-Ring (or close to it).

4. Measure the thickness of the O-Ring as best you can. This number will be close to either a fractional size, or a millimeter size. It's best if you can use a caliper to get this number, but a ruler with both inches and millimeters will do. Always make sure to round DOWN to the nearest fraction or millimeter since o-rings are oversized. For example a "3/16" cord width O-Ring is going to have a NOMINAL width of .210".

5. Write that number down.

6. Take both numbers and poke through the McMaster catalog in the o-ring section. You can find the nearest ACTUAL SIZE for Inner Diameter from their list as well as the ACTUAL (or fractional) cord width.



Just pick BUNA-N as your material for now. The majority of the o-rings used for Nerf are that material.



Now you have the DASH NUMBER of the o-ring you need. You can order the o-ring you need from McMaster, Amazon, Fastenal, or buy it from a hardware store. If you want to buy the o-ring from Home Depot you may need this chart to convert from DASH NUMBER sizes to the Danco brand o-ring part numbers.



Other brands may have different part numbers so check your nearest hardware store's online catalog before going to see what brand of o-rings they sell. If they don't list the products in DASH number sizes just e-mail the manufacturer and ask them for a similar conversion chart.

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#359017 Caliburn: Mag-fed Pump-action Springer

Posted by CaptainSlug on 04 April 2017 - 10:32 AM




Also, another video.


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#358767 THIS one simple design will have you in TEARS...

Posted by CaptainSlug on 24 March 2017 - 04:05 PM

This is a pretty rough draft at the moment. I won't get any further on this for a while until I have time to try making a magazine. And given how many other things I SHOULD be working on, who knows when that will be.

I just wanted to see what the layout would have to be for a miniaturized mag-fed Piranha. And Chanclas was correct, it could totally work. There's just enough room to get 3-1/8 inch of plunger stroke out of a 1-1/4 SCH40 pipe.


The cut in the front of the slide lets the cable feed through, but will pull on the eyelet of it to prime the plunger. I haven't decided on a return spring for the slide yet. One I have in mind might just barely fit over the barrel but may have to be stretched to get the right collapse length to extended length measurements. If I run out of room I'll probably just have to make the barrel a little bit further away from the plunger tube.




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#358698 Caliburn: Mag-fed Pump-action Springer

Posted by CaptainSlug on 22 March 2017 - 03:10 PM

Raise your hand if you like RAILS.


Work apparently has some leftover Platinum molding silicone so I'm going to make a mold or two this week for some of the simpler parts I haven't had to revise.


I figured out how to make a 2-part mold for the mag well and that necessitated some changes that mushed up the styling so I had to reprofile it and the grip in a new pattern. So the lettering has been moved to the mag well.


The test print of the foregrip also lacked some vertical girth and was promoting weird hand-hold positions. So it gets a 5-point underside rail and a slight profile adjustment.


The grip has been split into 3-parts so that it will print much easier and subsequently be much MUCH easier to cast. The print orientation means that even a low infill percentage print of these parts should be more than strong enough.



It seems that the only part left to annoy me is the stock reducer. The cast part is going to have to be FAT if I want to make it from a one-sided mold and it really can't be avoided. So the printed version of that part will be slightly cooler looking as a result.


Time to order some supplies. Then I get to make 16 molds

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#358664 Caliburn: Mag-fed Pump-action Springer

Posted by CaptainSlug on 20 March 2017 - 07:02 PM

Use the STEP file until I can get the solidworks file set fixed.


002 and 003 made it safely to Singapore through an export agent.


Colorblind test prints check out.
"Charlotte" is a very homely yet sturdy thing


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#358328 1995 Crossbow CAD Files

Posted by CaptainSlug on 02 March 2017 - 11:23 AM

Full K26 version with stock extended by 1.500 inches. Also requires a separate nose piece to hold the end of the plunger tube which had to move 2.500 inches forward beyond the profile of the original shell.


STEP 214: http://captainslug.c...Crossbow95b.zip(1.4mb)

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#358286 1995 Crossbow CAD Files

Posted by CaptainSlug on 28 February 2017 - 08:15 AM

Fusion360 and Sketchup can open/edit STEP or STL files. STEP is much preferred because it's a solid model format instead of a mesh format AND it supports exported assemblies. I can give you ONE STEP file that includes all of the parts in their correct assembled locations. STEP is also compatible with CAM software like MasterCAM. But most printers (and related software) take STL files exclusively.


The software I am using (Alibre Design 12) is quite old but functional and I really hate the new versions. 3D Systems bought them, changed their name, and turned the new versions into bloated garbage.


And it looks like I'm going with PurpleHeart since its natural oxidized color is perfect.

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