Yeah, I wasn't thinking. Coil springs are torsion bars, make them shorter and
the rate goes up.
On Mar 25, 2010, at 6:41 AM, Joe Curry wrote:
> I beg to differ.
>
> Think about it this way. If you have a piece of spring steel 20 feet long
> and extend it between two fixed points and then apply a weight to the
> center, it will droop a given amount. The cut off a portion of it and move
> the end points closer together and reapply the same weight. It will sag
> less. Wind that steel into a coil and you get the same effect.
>
> The spring rate of the steel did not change (unless you heat it changing
the
> properties) but the total amount of travel will become less, making the
> spring stiffer.
>
> The same thing happens with leaf springs.
>
> Joe C.
>
> -----Original Message-----
> From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
> Behalf Of Bill Babcock
> Sent: Thursday, March 25, 2010 9:00 AM
> To: Kramer, Robert
> Cc: 'Friends'
> Subject: 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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