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Author Topic:   spring rate tester
srt97
Dirt Roller

Total posts: 7
posted April 02, 2005 05:05 AM  
does anyone have plans for a home made coil spring rate checker at all? has anyone tried the rate calculator in the toolbox and if so how acurate was it? unfortunatly i dont have access to a rate tester and i just used my scales (from the toolbox) and the % are not pretty
thanks

Eljojo
Dirt Forum Champ
Total posts: 968
posted April 02, 2005 05:42 AM  
I have been thinking about making a fixture for my scale pad that will support a spring and a bottle jack. Then I think I could get an accurate spring rating by preloading the spring, zeroing the scale, and compressing the spring another inch.

BIGG C
Dirt Maniac

Total posts: 113
posted April 02, 2005 01:20 PM  
I also dont have a spring checker. By looking at the speedway one, it would be fairly simple to make with 1inch tubing and a jack. Could a guage be screwed in the release or let down valve? Northern tool has 2 1/2 inch guage for $15. This could be teed into valve. Would this read spring pressure? Same as hydrolic pressure? BIGG C

sideways
Dirt Forum Champ
Total posts: 715
posted April 02, 2005 06:26 PM  
It really should be compressed to preload and then to the first inch take reading and then an additional inch and subtract the readings.However if it is used just for reference for you and or your buddys springs that cool too.As long as the tests were all linear.Eljojo I have done it similar to the way you was thinking.I did it to cut the rr spring I was useing and built a stiffer one from another larger coil stock spring.Worked good for me.Before access to spring rater.I have also done stock pigtails on a bathroom scale with a 2x6 across it in a large drill press with a crank worm gear on it.

[This message has been edited by sideways (edited April 02, 2005).]

[This message has been edited by sideways (edited April 02, 2005).]

srt97
Dirt Roller

Total posts: 7
posted April 02, 2005 07:11 PM  
bigg c i've been thinking along the same lines my thought was to use a ram with a 1 inch square surface area then the gauge reading of psi should be the poundage of the spring
using a jack, if you find the surface area of the ram in the jack you should be able to work it out

srt97
Dirt Roller

Total posts: 7
posted April 04, 2005 05:19 AM  
i measured the area of a jack ram today, its 1.76" square, fitting a gauge in is pretty easy. so i think if i divide a psi gauge by this figure i should be right. if this sounds wrong please tell me
thanks

driver27
Dirt Maniac

Total posts: 194
posted April 04, 2005 11:26 AM  
Ive used the spring rate calculation formula based on wire diameter, spring diameter and mumber of active coils along with height, and as long as your measurements were very good, the spring rate was within a few pounds of what the tester showed. Works good on heavier spings, but not as accurate on lighter spings seems to be my experience. For what its worth.

    

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