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Reporting the mass of your uncut rubbers

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hleett View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hleett Quote  Post ReplyReply Direct Link To This Post Posted: 12/31/2018 at 7:19pm
Here is my attempt to figure out the area of the most common blade size of 15.7x15.0cm. These blades include BTY TBS, Amultart, Schlager Carbon, Timo Boll, ZJK, MJ ALC/ZLC/ZLF/T5000/W7, Viscaria etc....and quite a few other popular brands as well.
Since 15.7x15.0 is not a perfect circle I am taking the average of these 2 numbers of 15.35cm diameter, 1/2 that for radius of 7.675cm. Since 
Area= π r
we have Area = (3.14159) x (7.675 x 7.675) 
Area is 185 square cm. Now multiply this number by your rubber's Gram/Sq cm and figure it's weight.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/01/2019 at 6:34pm
A PIECE OF WISDOM.
How do I know effective Playing Area of my racket blade wirh a high accuracy up to 0.1 square cm.

My best preffered method to find the playing area is as follows.   Materials needed
   -- A pair of scissors
   -- Sheet of a smooth cardboar A4 size   (my usual choice those pictorial cellulose dustcover to wrap Vynil diskus)
   -- Digital scales reading to 0.01 gramme

1. Cary over the blade's outer shape onto the cardboard sheet and cut the figure out. Weigh up the Figure (FW).

2. Cut off a square sample 10 x 10cm from the figure and weigh up the Sample (SW)

3. The Playing Area (Figure Area) = WF *100 / SW   cm2

Be Happy.

   PS// Through applying this procedure on many different rackets, I did found out that effective playing surface on most regular blades proved to be in the range of 200 -- 203 cm2.

Edited by igorponger - 01/02/2019 at 8:31am
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fatt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatt Quote  Post ReplyReply Direct Link To This Post Posted: 01/02/2019 at 1:26am
I found 195 in an old thread. also the 72/28 average seems good for the typical 169mmx169mm rubber and a 157x150 blade: a rubber that's 71 gr uncut will be about 0.72x71g= about 51g.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/03/2019 at 3:16am
Digital Scales is the very praised havings, indeed



A time ago, I had got to calculate effective playing area on those fancy shapes, in exact numbers to 0.1 decimal.




Thankfully, I was able to make the very best use of my digital balance, to my very best satisfaction. Educated mind is a great attainment, indeed.   

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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/03/2019 at 4:18am
Originally posted by Simas Simas wrote:

found a picture of my Palio AK47 Blue. Mine is very light.
Thickness: MAX
Colour: Black
Uncut Mass: 53g
Length: 166mm
Width: 166mm


    Hi, Simas
Just to proven the power of arithmetics.   I can instantly tell you the very exact cut weight on this rubber without making any physical reduction of the rubber sheet. It is kinda like a magical prophecy, indeed.
Let's go .....

53 / 16.6 x 16.6 = 0.192 g/cm2   Specific Weight of the Rubber
0.192 x 200 = 38 grammes           Cut weight estimated

So, you can now safely expect your present rubber sheet of AK47 to go reduced to 38 grammes after trimming.
Please let me know if my prediction meets the factual weight after trimming on the rubber.

Edited by igorponger - 01/03/2019 at 4:49am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Simas Quote  Post ReplyReply Direct Link To This Post Posted: 01/05/2019 at 7:02am
Originally posted by igorponger igorponger wrote:

Originally posted by Simas Simas wrote:

found a picture of my Palio AK47 Blue. Mine is very light.
Thickness: MAX
Colour: Black
Uncut Mass: 53g
Length: 166mm
Width: 166mm


    Hi, Simas
Just to proven the power of arithmetics.   I can instantly tell you the very exact cut weight on this rubber without making any physical reduction of the rubber sheet. It is kinda like a magical prophecy, indeed.
Let's go .....

53 / 16.6 x 16.6 = 0.192 g/cm2   Specific Weight of the Rubber
0.192 x 200 = 38 grammes           Cut weight estimated

So, you can now safely expect your present rubber sheet of AK47 to go reduced to 38 grammes after trimming.
Please let me know if my prediction meets the factual weight after trimming on the rubber.

Nice. But can't do that. The rubber is glued for some time now on my spare setup. When I peel it, if I won't forget, I will :)


Edited by Simas - 01/05/2019 at 7:03am
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piligrim View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote piligrim Quote  Post ReplyReply Direct Link To This Post Posted: 01/05/2019 at 7:22am
Originally posted by igorponger igorponger wrote:


Let's go .....

53 / 16.6 x 16.6 = 0.192 g/cm2   Specific Weight of the Rubber
0.192 x 200 = 38 grammes           Cut weight estimated

So, you can now safely expect your present rubber sheet of AK47 to go reduced to 38 grammes after trimming.
Please let me know if my prediction meets the factual weight after trimming on the rubber.




I have this rubber. it weight 42g cut for regular size blade
Choo-Lei
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/05/2019 at 2:21pm
Still waiting for Simas response ....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/05/2019 at 3:03pm
Originally posted by piligrim piligrim wrote:


I have this rubber. it weight 42g cut for regular size blade

There is nothing wrong about the rubber.
    AK47 RED , high density sponge, 56 gramme uncut sheet (as owned by Piligrim )
    AK47 BLUE, low density sponge, 53 gramme uncut (as owned by Simas).

47 BLUE ultra light sponge, it feels much like squirell feather, indeed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote haggisv Quote  Post ReplyReply Direct Link To This Post Posted: 01/06/2019 at 6:53pm
If all blades were the same shape and size, we could easily use the same formula... but unfortunately blade shapes and sizes vary significantly.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote hleett Quote  Post ReplyReply Direct Link To This Post Posted: 01/06/2019 at 8:37pm
The formula is the same, just have to figure out the blade area plug in the G/(cm)(cm) values of your rubber. You don't have to be a rocket scientist to figure that out.Sleepy
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndySmith Quote  Post ReplyReply Direct Link To This Post Posted: 01/19/2019 at 9:17am
Brand: Xiom
Rubber ID/Model: Omega 7 Pro
Thickness: Max
Colour: Red
Uncut Mass: 68.15g
Length: 169
Width: 169

Brand: Xiom
Rubber ID/Model: Omega 7 Pro
Thickness: Max
Colour: Black
Uncut Mass: 66.82g
Length: 169
Width: 169

Brand: 729
Rubber ID/Model: Bloom Arc H45
Thickness: 2.2
Colour: Black
Uncut Mass: 61.31g
Length: 163
Width: 163

Brand: 729
Rubber ID/Model: Bloom Spin H45
Thickness: 2.2
Colour: Black
Uncut Mass: 66.76g
Length: 163
Width: 163
This was a great signature until I realised it was overrated.
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