Knocking in a new bat
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norbs

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Re: Knocking in a new bat
« Reply #30 on: September 28, 2010, 02:10:15 PM »
Blimey you kids nowadays....


When a bat is pressed it creates a stiff surface layer on the face of the bat. If you press it to hard the willow fibre’s combine together to deeply into the wood and the blade has no real rebound [ping] If it is to soft then lots and lots gentle knocking is required to stiffen up the blade and then more rigourous knocking. At the end of the day we all hope that we don’t get an over pressed bat and then the basic idea is stiffen the surface


Knocking In

On the left side is surface stiffness along the bottom is hours spent knocking in.
Look at the dot shape and 0hrs of knocking in and then at 4 hours. The surface stiffness has doubled!!!!
So what has happened - The core of the bat is left unhardened resulting in a more elastic response of the bat.
« Last Edit: September 28, 2010, 02:15:33 PM by norbs »
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lozlis

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Re: Knocking in a new bat
« Reply #31 on: September 28, 2010, 02:15:19 PM »
knocking in will protect the surface of the bat from cracking as it will gently compress the willow fibres, rather than have the full force of the ball when the surface is 'soft'. However I guess it is likely that this 'compression' will also affect the bat's coefficent of restitution which is essential for a good 'ping'...

see http://www.laverwood.co.nz/newsletter/5.htm
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Canners

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Re: Knocking in a new bat
« Reply #32 on: September 28, 2010, 02:44:09 PM »
Quote from: norbs on September 28, 2010, 02:10:15 PM
Blimey you kids nowadays....


When a bat is pressed it creates a stiff surface layer on the face of the bat. If you press it to hard the willow fibre’s combine together to deeply into the wood and the blade has no real rebound [ping] If it is to soft then lots and lots gentle knocking is required to stiffen up the blade and then more rigourous knocking. At the end of the day we all hope that we don’t get an over pressed bat and then the basic idea is stiffen the surface


Knocking In

On the left side is surface stiffness along the bottom is hours spent knocking in.
Look at the dot shape and 0hrs of knocking in and then at 4 hours. The surface stiffness has doubled!!!!
So what has happened - The core of the bat is left unhardened resulting in a more elastic response of the bat.


norbs i didnt think you were doing these masterclasses anymore lol
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roco

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Re: Knocking in a new bat
« Reply #33 on: September 28, 2010, 02:50:38 PM »
I wondered how long norbs would resist lol
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norbs

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Re: Knocking in a new bat
« Reply #34 on: September 28, 2010, 02:56:43 PM »
Damn it yep.... I should delete it but you've quoted me now!  >:(
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100 not out

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Re: Knocking in a new bat
« Reply #35 on: September 28, 2010, 08:55:47 PM »
so roughly four hours then. . .
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maxy1

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Re: Knocking in a new bat
« Reply #36 on: September 28, 2010, 09:09:13 PM »
Quote from: 100 not out on September 28, 2010, 08:55:47 PM
so roughly four hours then. . .

iv always done about that :D
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norbs

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Re: Knocking in a new bat
« Reply #37 on: September 28, 2010, 09:13:06 PM »
Quote from: 100 not out on September 28, 2010, 08:55:47 PM
so roughly four hours then. . .

Nope it doesn't mean that at all
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tim2000s

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Re: Knocking in a new bat
« Reply #38 on: September 28, 2010, 09:16:59 PM »
Nope. Simply that the longer you knock it in for, the greater the increase in surface stiffness compared to the change in hardness of the centre of the bat. I'm sure there is an optimum time period though, that isn't shown in the graph, at which point the "hardness" of the middle increases in a more exponential fashion?
« Last Edit: September 28, 2010, 09:22:47 PM by tim2000s »
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100 not out

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Re: Knocking in a new bat
« Reply #39 on: September 28, 2010, 09:18:28 PM »
so can a bat be over knocked in. .
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100 not out

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Re: Knocking in a new bat
« Reply #40 on: September 28, 2010, 09:19:31 PM »
Tim are u related to Norbs . . ?
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tim2000s

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Re: Knocking in a new bat
« Reply #41 on: September 28, 2010, 09:21:56 PM »
 :D No. Just an engineer at heart who can read a graph  ;)
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pacman75cricket

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Re: Knocking in a new bat
« Reply #42 on: September 28, 2010, 09:24:07 PM »
If im reading this right by creating too much surface stiffness on the blade you in effect capping off the rebound ability of the blade.
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tim2000s

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Re: Knocking in a new bat
« Reply #43 on: September 28, 2010, 09:30:29 PM »
If you had a rock hard bat, the CoR (bounceability) would increase dramatically, (think diamond on diamond) but it would feel like batting with a rock!

I guess the example would be a metal bat, which in theory would "bounce" better than a wooden one because it is harder.
« Last Edit: September 28, 2010, 09:34:25 PM by tim2000s »
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100 not out

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Re: Knocking in a new bat
« Reply #44 on: September 28, 2010, 09:32:46 PM »
gonna ask a stupid question here. . . . . how does this relate to laminated bats. 
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