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petermoo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote petermoo Quote  Post ReplyReply Direct Link To This Post Posted: 11/06/2008 at 9:55pm
Originally posted by roundrobin roundrobin wrote:

Dear Mr. President Sharara:

Could you please clarify for us if it's okay for manufacturers to add tension to approved topsheets by mechanically stretching it prior to gluing to the sponge.  In some rubber models even the sponge is stretched.  This is done mechanically to simulate the speedglue effect to increase spin and speed.  As I am sure you are aware that speed glue expands the sponge to stretch the topsheet, thereby creating artificial tension in the rubber covering.  "Tensor" rubbers are stretched by the factory.


Best Regards,

William Lin
 
Factory tension = OK
Player tension = illegal harmful shameful modificaion
 
Factory speedglue tuning = Ok , new clean era , all of the pleasure
Player tuning = cheater, poisonous , ban him
 
Factory tuning price $65 per sheet = OK
Player tuning price $25 per sheet = trying to rip off manufacturers.
 
 
Petermoo
 
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tommyzai View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tommyzai Quote  Post ReplyReply Direct Link To This Post Posted: 11/06/2008 at 10:07pm
Factory tension = OK
Player tension = illegal harmful shameful modificaion

Factory speedglue tuning = Ok , new clean era , all of the pleasure
Player tuning = cheater, poisonous , ban him

Factory tuning price $65 per sheet = OK
Player tuning price $25 per sheet = trying to rip off manufacturers.


Now you're talkin'!!!!
It's getting clearer isn't it?

Did someone say, "CLASS ACTION LAWSUIT"?
THE UNSTOPPABLE EJ MADMAN!


For More Information, Contact: tommy@tommyzai.com
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igorponger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 12/05/2017 at 9:01pm
OFFER OF COOPERATION.
Originally posted by and- and- wrote:

Friction measurements. I will send a copy of this suggestion to your e-mail during the coming weekend (I need time to prepare som scketches).

4.1). The current rule says that "the friction should be more than 24mN". I believe that the text of this requirement is unacceptable.

4.1.1). First of all, friction is a property of a pair of materials: rubber-ball, rubber-glass, rubber-sand paper... The object which is used for testing rubber should be mentioned in the rule.

4.1.2). Secondly, friction almost always depends on the force which presses those two objects together. If I'm testing a ball and a rubber, and the only force which presses them against each other is the weight of the ball, then even Butterfly Bryce barely passes this test. However when I'm pressing the ball down with force ~10-30N (~100-300g) then even a glass plate passes this test without a problem. In the rule we must specify the test conditions: force, which presses these two objects against each other, shape and material and surface quality of the object, is it the stick or the slip friction we are testing.


Dear Mr. and-

Please take my most sincere compliments.
Every your advice aforesayed was acepted and implemented by ITTF by now.
Below is the latest revision of the ITTF friction test, wich exactly reflects your given proposals.

   T4 Racket Coverings, 2017 edition.   
    8. Friction for pimples-out
    The coefficient of kinetic friction between the rubber and a table tennis ball must be at least 0.50. In the laboratory test, a normal force of 50mN is applied.


https://d3mjm6zw6cr45s.cloudfront.net/2017/10/T4_Racket_Coverings_BOD2017.pdf_0.pdf

This is the laboratory testing machine for doing friction test on the pimpled rubbers.



Dear Sir,
Also, seeing your many sensible advices, could you help us to deal with the "booster issue"?     What do you think the best practicable way to control those illegal additives in the rubber?

Thanks.






Edited by igorponger - 12/05/2017 at 11:37pm
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bbkon View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bbkon Quote  Post ReplyReply Direct Link To This Post Posted: 12/05/2017 at 11:34pm
Originally posted by tommyzai tommyzai wrote:

Factory tension = OK

Player tension = illegal harmful shameful modificaion



Factory speedglue tuning = Ok , new clean era , all of the pleasure

Player tuning = cheater, poisonous , ban him



Factory tuning price $65 per sheet = OK

Player tuning price $25 per sheet = trying to rip off manufacturers.




Now you're talkin'!!!!

It's getting clearer isn't it?



Did someone say, "CLASS ACTION LAWSUIT"?



short story. personal boosting is dangerous to companies s profits
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