Yinhe friction tester. Great assistance, anyway.

[igorponger]

粒顶摩擦力检测仪

银河乒乓球长胶胶皮摩...-Taobao

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Specifically designed for the good of retailers, shoppers, resellers being engaged in marketing of table tennis products. What good is it?? It is gonna to tell you the whole truth about degree of friction on the rubber. Great assistance, indeed.

 

[igorponger]

Useful read on rubber testings. Google Translating Еngine is recommended.

『收藏』如何检验固化长胶、大颗粒长胶兼谈银河摩擦力检测仪的使用_手机网易网

如果您是一位乒乓球爱好者，您需要读一读这篇文章，让你了解有关器材的一些规定和规则。如果您是一位乒乓球赛事的组织者，您更需要读一读这篇文章，让您对二次加工的胶皮有更为明确的鉴定方法。

m.163.com

 

[lodro]

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[brokenball]

When a TT ball impact rubber, initially the force is zero, but it builds up as the ball sinks into the rubber. The force is multiplied by the coefficient of friction to get the frictional force. It is the coefficient of friction that needs to be tested. The coefficient of friction will also vary depending on impact speed. An example is tacky vs non-tacky rubbers. It should be obvious that the coefficient for tacky rubbers is MUCH higher during low impact forces than non-tacky rubbers, but this difference should become smaller as the impact forces increase.

The problem with the tester in the video is that it doesn't test the friction at higher impact forces or much of any force at all.

So why is it that no one talks about the coefficient of friction? People mention grip but that is an opinion, and no one has defined it.

How much tangential force is applied to a ball to make it spin at 100 rps when initially the ball was spinning 100 rps in the opposite direction? What does the coefficient of friction need to be?

 

[pong99]

Another new year, same old igor rehashing this ridiculous contraption for the nth time

As has been pointed out by posters many times before, this plastic thing tests static friction. The ittf spec test calls for a test of kinetic friction.

The kinetic test is only done at rubber approval in a controlled lab on a professionally calibrated tester. There is no ittf racket control procedure for friction testing at an event. (T9 Technical document)