Nelson Powertube and Spring dimensions
Another relevant thread is linked here: http://www.mcarterbrown.com/forums/r...rrel-guns.html
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I was going to post this in the Redux section but it's so general I couldn't justify it.
Found on the Nelson Owners Group forum (NOG) posted by "B" our very own (former?) retrogrouch, here: Nog -> Power Tube And Spring Spefications
Main spring is 2.0" long, about 0.48" od, 0.375" id
valve spring is 1.0" long, about 0.36" od, about 0.265" id
Valve tube (aka "Power tube") inside diameters:
tube # inside dia. (tube brand measured)
-2 .112" (unknown)
-1 .114" (unknown)
0 .122" (unknown)
1 .134" (unknown)
2 .142" (unknown)
3 .152" (carter)
4 .172" (lapco)
5 .174" (unknown)
6 .189" (lapco)
tube # inside dia. (Line SI)
Line SI only made those 4 power tube sizes.
If someone can test them pencil strengths of the springs should be added.
you can figure out rough compression strengths by the wire diameter. (OD-ID)/2
Here's a Wiki link for the not so bright tinkerers (like me). It shows decimal-fraction equivalents.
File:Decimal-fraction equivalents--v0006.png - Wikipedia, the free encyclopedia
(Heh, I'm lovin the smiley face that pops up in the middle of the link.)
Here is a link on how to measure spring compression if you have a gram scale (I think). There is probably a similar and maybe better method out there that would use something called "Solid height" and a different mathmatical calculation I'm sure.
How to Calculate Compression Spring Strength | eHow.com
I may have to start working on that
Redneck, that's assuming we know the pitch of the spring, as well.
Anyone know what the stock number of coils was?
I just took some photos of a set of springs, next to a tape measure.
Two springs are a bit odd.
In the first photo, the far right blue valve spring is longer than the others and the bare metal spring next to it seems shorter than others.
Are these even Nelson springs?
More spring info:
So, to harden my valve spring, I can just heat it in some boiling water and then quickly cool it in ice water?
Tempering - Wikipedia, the free encyclopedia
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