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Springs For A Snap

What size?

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#1 monkey with a nf

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Posted 15 June 2007 - 06:55 PM

What size spring do you use for homemades? I am currently using McMaster part 9637K26(same as KBarker's NF rifle mod) for my SNAP 1.5. It has a wire thickness of .08, with the coils spaced about 1/4" apart, and fits perfectly over 1/2" CPVC. The spring is 9" long, and the SNAP has a draw of 5".

However, I'm a bit worried that it's too strong. In addition to requiring quite a bit of force to draw, it has so far shot off the reducing bushing (before I screwed it down), the coupler/bushing assembly (before gluing it), and then the coupler/bushing again, as well as breaking the back endcap on the plunger head (which had, in retrospect, been sanded down too much). Note that there is no forward endcap on the plunger, as I don't have the right washers for the seal. Am I doing something wrong? Please help, as I don't want to have this thing blow up in my face...
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QUOTE(Pineapple @ Sep 12 2007, 03:13 PM) View Post

For maximum efficiency?


1. Pump up. Count how many pumps.

2. Keep going until you hear a loud "bang".

3. Subtract one pump from the total. Rebuild your air bladder.


There you go.

#2 six-five-two

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Posted 15 June 2007 - 07:43 PM

You could always try a AR-15 Rifle Spring.
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#3 Carbon

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Posted 15 June 2007 - 07:47 PM

Nope, sounds like you're using exactly what I use. And yes, it has enough power to shoot the reducing bushing across the room. They definitely need to be screwed together. The glue you're using to hold on the coupler won't work for long...get some pan head screws as short as you can, and screw it to the PC. If they're too long, trim them shorter and screw it down. Just so long as they don't protrude into the PC, you're fine.
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#4 monkey with a nf

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Posted 15 June 2007 - 07:49 PM

Do you know what wire size/ coil distance they are? I might be able to compare.
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QUOTE(Pineapple @ Sep 12 2007, 03:13 PM) View Post

For maximum efficiency?


1. Pump up. Count how many pumps.

2. Keep going until you hear a loud "bang".

3. Subtract one pump from the total. Rebuild your air bladder.


There you go.

#5 Carbon

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Posted 15 June 2007 - 08:20 PM

Coil spread is .25", spring is 9" long, and the diameter is about 5/8". I'm pretty sure that the wire is about what you said, something like .074. It's pretty much a match to your spring.
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#6 monkey with a nf

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Posted 16 June 2007 - 06:49 AM

Thanks for the help. Now I just need some endcaps and washers.
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QUOTE(Pineapple @ Sep 12 2007, 03:13 PM) View Post

For maximum efficiency?


1. Pump up. Count how many pumps.

2. Keep going until you hear a loud "bang".

3. Subtract one pump from the total. Rebuild your air bladder.


There you go.


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