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PostPosted: 14 Sep 2018, 09:19 
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I am an engineer and I've always wanted to know the insider tests used to calculate speed, spin, and control by the table tennis companies for both rubbers and blades. Now, I understand that each company has a proprietary method and that the numbers won't match up between companies, but within companies there has to be some sort of standardized method to calculating this, right? Or is it all just marketing?

EDIT: For reference, when we measure the properties of a material (like percent elongation of a rubber) there is an ASTM standard that engineers follow so our results are the exact same across labs. Anyone have any idea of a standard test used within a company like Stiga or Yasaka? Just curious!


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PostPosted: 17 Sep 2018, 11:05 
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Butterfly might have something like this. That ITTF lab in Singapore might have something like this. ESN probably does. Everyone else? I'll betcha it's simply two or three experienced players hitting with different setups and comparing them head-to-head and taking notes. With some of the smaller outfits they might even retire to the bar afterwards to compare notes and assign numbers over a couple drinks.. :lol: In other words - I don't believe much of this is very objective or quantitative. It's still far better than tabletennisdb or whatever it's called now.

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PostPosted: 17 Sep 2018, 17:09 
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Chiell JOHNSSON A GREAT EQUIPMENT JUDGE.

100 point evaluation scale is the most relyable. Look into Paddle Palace chart table, Contra catalogue of Germany. A Chief Evaluator alone, usually a versed pro player, would made the evaluations manually, in accodance to his own experience and perception.
Chiell Johansson used to be an Evaluator for Contra, for long while..


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PostPosted: 17 Sep 2018, 22:40 
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notcras wrote:
I am an engineer and I've always wanted to know the insider tests used to calculate speed, spin, and control by the table tennis companies for both rubbers and blades. Now, I understand that each company has a proprietary method and that the numbers won't match up between companies, but within companies there has to be some sort of standardized method to calculating this, right? Or is it all just marketing?

EDIT: For reference, when we measure the properties of a material (like percent elongation of a rubber) there is an ASTM standard that engineers follow so our results are the exact same across labs. Anyone have any idea of a standard test used within a company like Stiga or Yasaka? Just curious!

The problem is, you can't just assign a single number to speed, spin and control, because there are too many variables, like impact speed, angle, incoming spin, etc.

No doubt you could setup an experiment to take measurements for a very specific and fixed contraption, which would allow you to compare different rubbers/blades from different manufacturers. However the values would then only be true for that specific setup, and this may not actually relate to real-life perception of the property.

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PostPosted: 17 Sep 2018, 22:58 
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Given that there is no good way even to define what "Control" actually is - good luck constructing an objective measurement approach.

It's mostly marketing.

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PostPosted: 17 Sep 2018, 23:46 
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as a ping-pong rubber is just for fun, there is not a significant need to spend thousand of dollard to do the test. As anyone hit th ball differently, it is not significant to have precise test.

I think renown players or VIP in ping-pong field opinion is doing the job and much more apreciated by players If we were building bridge I would understand the importance of having such precise tests.


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PostPosted: 18 Sep 2018, 08:07 
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We need to be able to specify a common set of criteria for any tests. The tests would only be able to give one a relative measure between equipment. Already people say that one rubber is spinnier or faster or more controlling or ... than another rubber without objective measurement. Also the contention of how much less spin is on the 40+ ball than the 40 ball.

Testing Equipment
First the equipment to be used. I would suggest that a robot would be useful for testing both blades and rubbers. Unfortunately most robots are not totally consistent in that on a particular setting the speed and spin that they produce can be variable. I suppose that this could be allowed for by measuring the speed and spin of each ball thrown from the robot and averaging used.
Equipment used for securing the blade and / or rubbers must be also specified, ie not allow for what in a human is a loose grip. To accurately measure speed of a ball and its spin some expensive high speed camera equipment is needed. Ah yes, and which ball should be used? NP40+, DHS D40+, XSF 40+ seamless, ... Also how to account for the variability of balls and their age?

The Blade
Unfortunately no 2 are alike, even within the one "model". The test would have to be without rubbers, as that would give unwanted variability. I would measure the bounce off a bare blade of a ball fired at it at various speeds. It would have to be secured to a rig that allows no movement and a particular "tightness". A robot could be calibrated to fire the balls at particular speeds, with absolutely no spin.

The Rubbers
Because of variability of blades, I would suggest that that the rubbers be attached to a steel plate of particular density and dimensions. Also, as with blades, there can be variability of rubber within a batch. We already attempt to measure the density of the top sheet and sponge combination. Next question is how to attach them? Glue sheets? Water based glue? Older VOC glues? Variability galore.
Balls with a variety of speeds and spins should be fired at the rubber and the bounce and direction off the rubber measured. Next what combinations of speed and spin to test?
Given that there are hundreds of rubbers in the LARC, and then within that there are the various thicknesses of sponge with most of them, then there is the retail / provincial / national / CNT versions of some Chinese rubbers, also cases where the there appears to be different "versions" of certain Chinese rubbers, the job to test all rubbers in a scientific way seems to be a Herculean task. Oh and I almost forgot, only the top sheet is really specified in the LARC, and it is possible to mix and match the underlying sponge with the top sheet, and you can buy sponge separate from top sheets.

The Combination?
Then there is the effect reported by some of the effect of the rubber on the other side of the blade on how a rubber plays on a particular blade. Measuring that just complicates things to the nth degree.

Then there is the effect of how a particular blade complements a particular rubber for a particular player, or at least the belief in that effect that fuels the eternal EJ.

I could go on :)

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PostPosted: 18 Sep 2018, 09:56 
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Add high speed cameras to all of the above. With proper backdrops. You'd need some sort of super-robot capable of firing balls at known speeds and RPMs.

I'm pretty sure Butterfly and ESN have this stuff. Plus a lot of evaluator-players who play under controlled conditions as well, with cameras and such.

Iskandar


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