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Nurf Doctor

Member Since 27 Feb 2012
Offline Last Active Dec 29 2019 09:01 PM

Posts I've Made

In Topic: 1995 Crossbow CAD Files

31 May 2017 - 07:44 PM


My PETG print is coming along nicely. Little cleanup and it's basically perfect. Also got the internals from McMaster-Carr today, so I need to figure out a good way to get my aluminum tube cut down with a decently straight cut.

In Topic: 1995 Crossbow CAD Files

26 May 2017 - 11:11 AM

Ah, ok that does make sense. I guess if you were using a larger diameter spring then it wouldn't be as necessary, though I'm not sure if I would trust printed parts to stand up to something like my K34 pieces.

In Topic: 1995 Crossbow CAD Files

26 May 2017 - 09:27 AM

If this is a necro then I really do apologize. Looking through the file for the extended version, I found this piece



and I cannot find any mention of it in this thread. I found it in this spot in the blaster



and it appears to perhaps be a piece to keep the spring centered, but I'm not completely certain.


Again, apologies if this is a necro, but I'll be attempting to tackle this print soon and I'd rather not fuck up something that will have this much time into it.

In Topic: Exhaust Valve Homemade (Current: Bladder Tests)

12 April 2015 - 10:35 PM

I believe the point is that we have run in to /many/ dummies here who do not have a proper respect for pressurized gasses. 80 PSI is rather a lot for nerf. For one, it can be cumbersome to generate, and not everyone has access to the kind of tooling that Roboman has.

Thing is, for pressure as low as 80psi, or even 100psi, you don't need any tooling at all; Just grab a 2-3" steel pipe nipple, a cap for one end, and a reducing fitting for the other, then you have a pressure chamber that can hold any pressures a person can generate by hand. Hell, for less than 150psi, PVC is just as fine if you know to use primer and glue for the slip joints and stay below 2" pipe and fittings.

In Topic: Exhaust Valve Homemade (Current: Bladder Tests)

12 April 2015 - 12:17 AM

I don't see how using a metal pipe nipple is at all dangerous. Every metal pipe nipple that is commercially is more than adequately rated for the "high" pressures that we can put into them with hand pumps. Hell, so is almost all PVC as well unless you get foam core or up past 6". Sure, using soda bottles is kinda stupid, but not really sure how that's even related. About the worst thing you can do to a pipe nipple is not screw it down properly, and that leads to a slow leak, not even a safety issue.