1. ## simple sbs tester

I made some pictures of the idea above, that may show it better

2. Originally Posted by stringtechno

Buy this kind of gauge it should not be more expensive than \$20.
Attachment 155517

.
What kind of gauge is that, a dynamometer, or should it measure distance ?

I would like to build this setup to test the results from my stringway bl-90

update: searched a bit more and I thinks it's called meetklok in dutch and measures distance.

4. Hi MvdZwaan, also Dutch I see.

As you already found out the clock is a normal distance measuring clock , you can buy this in the Netherlands with Hogetex for € 12.

This is one

http://www.hogetex.com/analoge-meetklok-0-10mm-0-01mm.html

The weight should be at least so high that you can measure a reasonable deflection of the stringbed. If you use 2 to 4 kg the deflection will be 1,5 to 3 mm which is perfect.

5. I just performed a small test, old racket strung with tactic TG-80 couple of months ago at 13.0/13.5 kg (just a test then to see how this tension worked out on my stringway).

I used a 6KG weight, and the deflection was 0.85mm.... That would equate to ~7KG/cm2 which seems to be too low...

Now to find out what I did wrong... I used a 4cm spacer ring on the stringbed which perhaps spreads out the weight too much ? (You did mention 4cm in your instructions)

6. With a 2cm diameter washer the deflection was 1.58mm. So that is one of the factors to use in the calculation, and it only weight divided by deflection. Seem perfectly logical to me...

Now to get the right diameter to compare to stringlab2....

Or is your suggestion to only use these measurements to compare to my own results ?

7. My weight is not 6KG but 3 I used an old dumbell with 3 on each side, so thought it was 6 .

So the 1st measurement actually is 3.5KG/cm2 with 4 cm washer. Should I multiply this with the surface area of the washer (12.5664) and thus the SBS is 44KG/cm2 ?

8. ## Kg per cm result

Good Dutch work Mvd Zwaan,

If your test is 0,85 deflection with a force of 3kg your stiffness is 3,53 kg/mm.
This means 35 kg/cm.

The Stringlab measures in kg/cm.

This is the highest value for badminton that I heard of and I think it is much too stiff.
Tennis pro’s use 34 to 37 kg/cm directly after stringing.
I doubt that 35 kg/cm can not offer the right feeling when playing with it in badminton. The shaft is much too flexible to cope with that.

I can send you the list with test results so that you can see at what stiffness values other stringers work.

The diameter of the disc is very important and 4 cm is kind of standard. All Stiffness testers which were on the market use this size including the Stringlab 2.

9. Just measured 3 others rackets,

Yang Yang Sword II1, BG-65, 8.0/8.5KG, strung 22-feb : 164 deflection : 18.2KG/cm
Yonex ArcSaber 11, BG-70Pro, 9.5/10KG, 25-nov : 162 : 18.5KG/cm
Yonex Voltric VT-70, BG-65, 9.5/10KG, strung oct/nov: 128, 23.4KG/cm

So only the ArcSaber with BG-70Pro seems odd (BG-70 has stiffer feel than BG-65, and is less elastic...). It's my main racket, and I have played 3 hours a week with it since stringing it.

10. ## Important for (tournement) players

I think that 15 to 25 kg/cm is the right stiffness for badminton depending on the preference of the player.

One of the main things of testing the stiffness as a player is that he knows his favorite stiffness and also knows when a restring is needed.

This is especially important for tournament players who have to deal with different stringers on every tournament.

11. ## photo's instead of drawings

Up till now we only showed pictures from our 3D drawing system, hereby some pictures showing the use for badminton.

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