The windings does infect the spring rate.
The formula is:
D = (G * dD^4) / (8 *dF^3 *n) [N/mm]
dD = wire diameter [mm]
dF = Spring diameter at wire center [mm]
n = number of windings
G = Modul [N/mm2] (for Springsteel 79500 N/mm2)
-----Urspr|ngliche Nachricht-----
Von: Bill Babcock [mailto:billb@bnj.com]
Gesendet: Donnerstag, 25. Mdrz 2010 17:00
An: Kramer, Robert
Cc: MadMarx; 'Friends'
Betreff: Re: [Fot] WG: Paging Tom Krieger re: rear springs
spring rate doesn't change when you shorten a spring unless it's
progressively wound.
On Mar 25, 2010, at 5:35 AM, Kramer, Robert wrote:
> Is there a formula to determine spring rates when you shorten a spring?
The
> Afco 2 5/8" springs that Greg Blake has pointed out come in 8, 10, 12 and
14
> inch free lengths. I want a 9" free length spring to keep my ride height.
If I
> buy a 700 lb 10" spring and cut off an inch I would guess at a rate
somewhere
> around 800 lb rate.
>
> Bob Kramer
> Sales Manager
> RDO Equipment Company
> 16415 N. IH 35
> Pflugerville, TX 78660
> 512-272-4141
>
> -----Original Message-----
> From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf
> Of MadMarx
> Sent: Thursday, March 25, 2010 9:46 AM
> To: 'Friends'
> Subject: [Fot] WG: Paging Tom Krieger re: rear springs
>
> _______________________________________________
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