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perfect model for a hemisphere


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#1 moe

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Posted 27 July 2005 - 12:54 PM

Heyho,

i think the topic already says what im searching for. Im looking for a perfekt model or photo for making a hemisphere for ball-shells.

Posted Image

thats waths lying aroung there im searching

greetz moe

#2 Arthur Brown

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Posted 28 July 2005 - 07:03 PM

Talk to a printer or box and carton maker to get the component parts supplied cut but flat.

That pic is horrific in terms of UK safety regs - that power press with NO gaurds
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Keep mannequins and watermelons away from fireworks..they always get hurt..

#3 Erwin

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Posted 28 July 2005 - 09:06 PM

Thats not a press for BP, that's a press to make hemi's.

Or am I wrong now?

edit:
Oops, I readed 'powder press'.....

Edited by Erwin, 30 July 2005 - 11:56 AM.


#4 paul

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Posted 28 July 2005 - 09:16 PM

You aren?t wrong :) This is only the press where the pasted pieces get pressed.

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#5 Richard H

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Posted 28 July 2005 - 11:08 PM

Arthur, since paper is not an explosive I would have few concerns pressing it :) If you look carefully you will see the flat hemi boards awaiting pressing in the moulds.

#6 RegimentalPyro

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Posted 29 July 2005 - 06:36 AM

Hmmmm

I think Arthur is more concerned about the possibility of limbs getting trapped in the press whilst in operation.

In the UK you would have all sorts of shields and guards that would preclude such an event happening. In other countries a less risk averse culture is prevalent of course.

#7 alany

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Posted 29 July 2005 - 08:17 AM

A guard would slow down the loading and unloading process a lot.

#8 paul

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Posted 29 July 2005 - 08:30 AM

Correct. And as you can see, this is a photo from a chinese or japanese manufacture. I think they have to mass-produce rather than to work "over-securely"...

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#9 Richard H

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Posted 29 July 2005 - 12:05 PM

Oh, fair enough I guess. When Arthur said "power press" I misread it as "powder press" :)

#10 adamw

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Posted 30 July 2005 - 08:10 AM

The press should still have at least a light-barrier safety system. Anyway... lets not get into that.

Here's something you might find useful about hemi-pressing. They use two of the 'petal' shapes overlapping (ie one crossing the 'gaps' in the other piece)
75 : 15: 10... Enough said!

#11 SwissTony

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Posted 30 July 2005 - 07:18 PM

If the machines in factories in Taiwan had guards, u reckon the would be as much cr@p in the shops as there is at the moment lol

Edited by SwissTony, 30 July 2005 - 07:19 PM.

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#12 Guest_PyromaniaMan_*

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Posted 31 July 2005 - 11:44 AM

Perhaps you could do the same except without the power press and with a vice? I am going to try this now, with the petal shaped shell thingummies and some pva glue paste, on a former, in a vice... wish me luck! (it's my birthday by the way[Woooh!])

#13 Sprengman

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Posted 03 August 2005 - 05:11 PM

I make my hemispheres like them on the picture above.

This is a picture from my Papersheets I use to press 2";3" and 4" Hemispheres.

Here you can see the Forms to press the hemispheres. (without the plungers)

I also have a Form for 6" built with Aluminium and a wooden Form to Press 8". Instead of using thin Kraftpaper as I use for Hemis smaller than 6", the great Ones are built from 3 Layers of 1mm thick cardboard.


I hope you will understand my bad english ;)

#14 karlfoxman

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Posted 03 August 2005 - 09:48 PM

Wow very nice!!! Love the formers, how are they made? On a lathe? I dont know why but i seem to enjoy making a shell with raw materials and seeing it work like a pro one! :D

Karl

#15 LadyKate

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Posted 03 August 2005 - 09:55 PM

I make my hemispheres like them on the picture above.

This is a picture from my Papersheets I use to press 2";3" and 4" Hemispheres.

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The paper sheets look pretty professional. Did you make them or buy them? If made, how and if bought, where?! :)

Edited by LadyKate, 03 August 2005 - 09:56 PM.





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