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Design of SPG springs?
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Posted by Greg Netzner (more from Greg Netzner) on Mon, 24 Feb 2003 13:57:55 Share Post by Email
In Reply to: cutting 87 SPG springs..., tyler, Sun, 23 Feb 2003 14:48:21
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If they're linear-rate springs, then all you'll get by cutting them is less travel. While the springs may APPEAR stiffer perpendicular to the axis of compression, they won't actually get any stiffer in the direction you want (Taylor's pen-spring example is a good way to see this; it's harder to bend over, but squeezes the same. And they're not really getting any stiffer when you bend them; you're simply moving the leverage point down the length of the spring, confining the bending forces over a shorter area & making it harder to bend over the remaining section). The cut springs retain the same spring rate they did before, but now you've reduced their available travel & they'll bottom out sooner.

However, if they're progressive-rate springs, then cutting them may make them less responsive over small bumps (assuming you cut the correct end off). You'll take off some of the "soft" section of the spring, but leave the "stiff" section. Again, this doesn't make the springs any stiffer, it simply removes some of the "comfort" portion & lets you ride on the "avoid bottoming out" portion. The cut springs retain the same total load-carrying capacity (they won't bottom out, unless you've cut the wrong end), but they'll feel stiffer because you've removed the section where most of your small-bump action happens.

It may seem cheaper to cut'em, but I'd have to agree with the others that getting springs built the way you want them is the way to go.

posted by 216.160.177...

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