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Author Topic: Cricket Bat Press...the design/ fabrication and testing  (Read 10121 times)

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Northern monkey

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #30 on: November 20, 2014, 04:46:53 PM »

Now I know your all bonkers on here

Bonkers and bored!
Cricket seasons a long way off, nice to have a little winter project
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edge

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #31 on: November 20, 2014, 09:24:48 PM »

Lol
My fault for poor explanation. Of course there would be no need to sharpen the roller! I was referring to the problem of shaping the blade face profile to match that of the roller so you're not fitting a square peg into a round hole, so to speak. If, unlike me, you are lucky enough to have a profiler then you can simply machine the blade face to match the curve of the roller. Of course if you want a flat face profile, like many modern bats, profiling the face is not a problem, but I feel it's better to offer an option to any customer. For this reason I made my own concave plane so I can manually shape the face of the blade prior to pressing. Which of course means having to maintain a concave cutting edge which can be a bit of a tricky think to do.
Hope this makes sense.
The bat press has been modelled in AutoCAD Inventor so all the stress analysis is done done for you, but thanks for the offer.
The whole thing is designed around an old lathe that was originally used to clean up the inside of wooden barrels apparently and had been sat in the hedge for over 50 years according to the hedge owner. It took days to clean it up and get it moving again but is perfect for using as a slide for the press.
Ah I see, makes sense! I'd always assumed the concave face was pressed in so interesting to hear about using a plane to shape it. Sounds like a good little project, I'd love to do something like this but I'd have to learn how to make bats first...
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tushar sehgal

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #32 on: November 21, 2014, 12:46:36 AM »

I am surprised no one has come up with a small portable press that is not expensive. Common all you mechanical engineers get to work. Don't need to know how to make bats just design something and sell there is a market for it
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tim2000s

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #33 on: November 21, 2014, 05:42:59 AM »

I am surprised no one has come up with a small portable press that is not expensive. Common all you mechanical engineers get to work. Don't need to know how to make bats just design something and sell there is a market for it
It's an interesting idea Tush.  The hardest parts would be weight and strength.  There's no getting away from the fact that you need to apply a significant amount of force to the bat face in a uniform fashion at a constant rate .

While this could be done hydraulically, the structure of your press must be able to cope, which is quite a challenge if you are trying to make it small enough to be portable.

There is a reason why most presses are very solid!
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Bambooman

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #34 on: November 21, 2014, 08:19:16 AM »

I am surprised no one has come up with a small portable press that is not expensive. Common all you mechanical engineers get to work. Don't need to know how to make bats just design something and sell there is a market for it
It's almost certainly true that many presses are over engineered many are based on historical designs in which stress calculations were not really considered and sizing was done on experience of the forces involved.
In my view, by far the main factor in cost is the bespoke nature of their construction. There will never be a mass market for these devices so costs will remain high as you are paying for the man hours used in manufacturing.
What's considered portable? The press I am having made is pretty small and can be broken down quite easily and each piece carried (not that far mind you).
I do remember an Australian manufacturer offering what looked like a relatively small , lightweight press for sale but forget where.

tushar sehgal

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #35 on: November 21, 2014, 12:39:22 PM »

It's almost certainly true that many presses are over engineered many are based on historical designs in which stress calculations were not really considered and sizing was done on experience of the forces involved.
In my view, by far the main factor in cost is the bespoke nature of their construction. There will never be a mass market for these devices so costs will remain high as you are paying for the man hours used in manufacturing.
What's considered portable? The press I am having made is pretty small and can be broken down quite easily and each piece carried (not that far mind you).
I do remember an Australian manufacturer offering what looked like a relatively small , lightweight press for sale but forget where.

Portable would be that you put it in a suitcase/trunk and take it on a plane with you, at least for me.

I am not an engineer, not even close to it  :-[ , but I was picturing something like 2 or 4 small hydraulic cylinders with roller attached to them (and some digital sensors for pressure) 1 or 2 on each side that compress when connected and bring the roller down onto a removable flat base that holds the bat/cleft

probably a stupid idea, but thats what i do for a living,,i throw out outlandish ideas to engineers all day and challenge them to make it happen  :D

You almost have to think of it like there is no press that exists in today's world, how are you going to design one using all the technology that is available to you, you can't think of existing designs as that could hamper your imagination/innovation
« Last Edit: November 21, 2014, 12:41:22 PM by tushar sehgal »
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Northern monkey

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #36 on: November 21, 2014, 02:11:26 PM »

The weight would be a factor in how portable it was

The roller alone is gonna be a fair lump of metal
The framework to hold the roller will have to be reasonably strong/ heavy?
A flat surface for the cleft to move on?
It all adds up
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tim2000s

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #37 on: November 21, 2014, 03:21:06 PM »

The two critical pieces are the application of pressure to the face of the bat and supporting the willow to allow this pressure to be applied, without it getting damaged. That's your set of requirements.

I can imagine something relatively small which looks nothing like the existing presses on the market, and would be relatively cheap to construct and build.

But you'd need to fund it....!

 
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Northern monkey

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #38 on: November 21, 2014, 03:23:28 PM »

You got a drawing of what you have in mind? That you could post on here?
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Northern monkey

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #39 on: November 21, 2014, 03:27:41 PM »

Another consideration is how often it's gonna be used
Could lighter weaker materials be used?
Ie aluminium for the roller
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tim2000s

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #40 on: November 21, 2014, 04:00:49 PM »

The two critical pieces are the application of pressure to the face of the bat and supporting the willow to allow this pressure to be applied, without it getting damaged. That's your set of requirements.

I can imagine something relatively small which looks nothing like the existing presses on the market, and would be relatively cheap to construct and build.

But you'd need to fund it....!
Not yet. I imagined it this afternoon. Would need to put my drawing skills to the test...
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Bambooman

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #41 on: April 14, 2015, 04:33:09 PM »

http://vid1279.photobucket.com/albums/y534/SticklebackCricket/Bat press test_zpsowrklyyy.mp4


It's been a while but here is a video of my press working for the very first time a few weeks ago.
Although the video does not show a cleft being pressed, I can say it works fine and has press about 10 bats since the video was taken.
The video shows me gingerly checking the slide doesn't hit the end stops as there is no electronic limit switch attached yet. Although I don't look it I was pretty chuffed!
« Last Edit: April 14, 2015, 04:37:51 PM by Bambooman »
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tushar sehgal

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #42 on: April 14, 2015, 05:08:36 PM »

Very nice mate
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Northern monkey

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #43 on: April 14, 2015, 05:53:06 PM »

Lovely bit of kit

Coupla weeks and mine should be up and running
Will post a vid
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mcgill123

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Re: Cricket Bat Press...the design/ fabrication and testing
« Reply #44 on: April 14, 2015, 11:40:22 PM »

Hello James .
Would it be possible for you to video a cleft being pressed?
It's a very impressive job you have done.
I recall you saying you had an 800/900 budget, did you come close to achieving this?.
If the funds were limitless, would you have been able to streamline you're design to enable it to become even more portable?.
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