How do you convert kgf/mm -> lbs/in

[pigeon]

As the title says... i cant seem to convert spring rates...

how many lbs/in would 2.4 kgf/mm springs be?

anybody knoooo

[GotBoost]

I suck @ math

[sanblaster1]

I do not know what kind of units those are or what they are used for Pigeon but it you type [conversions] on yahoo (and probably google) you will see a few websites dedicated to converting units. You may find your answer there..

[TheLastMarauder]

To go from kgf/mm to lbs/in, multiply by 56.
To go from lbs/in to kgf/mm, multiply by 1/56.

[sanblaster1]

Or listen to TheLastMarauder. Short and straight to the point. Nice.

[pigeon]

awesome, thank you very much!

[JesseSays]

2.2 lbs = 1kg

25.4mm = 1 inch

There's no such thing as kgf. Kg is a mesasurement of mass. Force in the metric system is the Newton.

[MazdaRacer]

i use this site on a regular bassis. has a bunch of different conversions.

http://www.convert-me.com/en/

[goldstar]

According to my online conversion site: www.onlineconversion.com ,both kilogram-force, pound-force and newton are listed as separate categories in the Force Conversion table.

[pigeon]

i was looking in the FAQ and i saw how spring rates are all listed in different formats....

kgf/mm
N/mm
lbs/in

those are the 3 different ways edwin listed them

I am familiar with lbs/in so I was trying to convert the OEM 3rd gen 2.0L spring rates to lbs/in...

why? because im thinking of putting coilovers on, and I wanted an approximate value for the spring rate for OEM protege springs

I want to get ground control coils, and im trying to get an idea what spring rates OEM or OEM quality struts could handle because thats what I have (KYB GR2's)

The 3rd gen spring rates are in kgf/mm, but ground control rates their springs in lbs/in

So I was attempting to convert kgf/mm to lbs/in... and once I came up with a number I would then have a better idea of what spring rates to get with the ground controls... because i would have a baseline for the OEM rates

Because the spring rates that the ground controls come with seem a little on the high side for KYB GR2's.. i kno they could handle a higher rate than the OEM springs, but 300lbs seems kinda high... and i dont want the car to start hopping on me, i cant afford adjustable struts just yet

am i still confusing everyone?

[JesseSays]

According to my online conversion site: www.onlineconversion.com ,both kilogram-force, pound-force and newton are listed as separate categories in the Force Conversion table.

That's fine. However, the SI system is the universally accepted system, and there's no such thing as a kg-f there. There would have to be a multiplier based upon altitude in order for it to work.

Absolute Metric uses the "dyne" as it's unit of force, and even then, it's derived from length, time, ,mass, and g(sub c).

Pound-force is ok, but you HAVE TO specify which system you're using when you say it, since it's included in both the English Engineering and Technical English systems. The difference being that Mass in the Engish Engineering isn't derived, it's just pound-mass, which is totally different from pound-force. In Technical English, mass is the slug, which is easiser to deal with.

Only the US still uses the English engineering and Technical English systems of units, and they're a total bitch and a half to work with, especially Engish Engineering, since there isn't a derived unit, and g (sub c) isn't 1 for purposes of unit conversion., and is infact 32.1740 lbm * ft /(lbf * s^2)

[pigeon]

ok... so you guys lost me

all i wanted to do was convert all the different units to one, so i can compare them...
is that possible?

[TheMAN]

you're correct that "kg-f" doesn't exist... but writing in that form is a universally accepted indication that you're using kg to measure force, not mass
although written as an expression, you don't actually *use* it during calculations

if you're really anal about what ought to be used for forces then Newtons is the way to do it... since using force with a mass type measurement (gram for example) is just a pretty hacked up way of doing it.... but it's commonly used and we just have to accept it

[TheMAN]

pigeon, I'm probably just confused here and I don't comprehend what you're asking because I don't understand TheLastMarauder's solution.

Are you asking what 2.4 kilogram-force/square millimeter = in pounds-force/square inch? If so, my online calculator states:

2.4 kilogram-force/square millimeter = 3,413.6 pounds force/square inch

2.4 kg = 5.2910943 pounds
1 square inch = 645.16 square mm
5.2910943 x 645.16 = 3413.3

Or am I crazy?

I didn't write anything in kgf/mm^2 so your conversion is not really correct

[TheMAN]

To go from kgf/mm to lbs/in, multiply by 56.
To go from lbs/in to kgf/mm, multiply by 1/56.

actually google says its 1kg/mm = 55.9974146lbs/in