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ball bearings

A place to ask general spud cannon related questions.
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Unread postAuthor: POLAND_SPUD » Mon Nov 19, 2007 6:31 pm

3" big is more like 1.8 kg....:shock:
but anyway
I don't think it makes sense to fire a 1.4 kg steel ball at almost point blank range :D
casting it from lead would be much better idea for your gun DYI - lead is denser than steel and it would deform more on impact... Do think about reducing chance of any ricochet

Your brain being splashed by a ricochet would make your clip very popular on youtube :violent2:
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Unread postAuthor: f.c » Mon Nov 19, 2007 6:31 pm

i made a sort of hop up system. look up modded bbmg its a bbmg i made with a hop up system of sorts.
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can i be a sasquatch ?
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Unread postAuthor: Ragnarok » Mon Nov 19, 2007 6:43 pm

POLAND_SPUD wrote:3" big is more like 1.8 kg....

Which would apply only if it were really 3" in diameter. It's 2 <sup>3</sup>/<sub>4</sub>" (7 cm) IIRC ,which works out pretty much bang on 1.4 kilos.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: POLAND_SPUD » Mon Nov 19, 2007 7:01 pm

yes sorry. They didn't write here about its diam.
Anyway this --> http://www.gewa.com.pl/page.php?d=kulki1wymiary seems quite accurate for steel.

Any idea how to get the weight of lead balls of given diameter with the use of this table ?

Does (lead density/steel density) * mass of steel ball in the table = mass of lead ball of the same diameter?
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Unread postAuthor: DYI » Mon Nov 19, 2007 7:47 pm

Lead ball mass = radius (in cm) x radius x radius x pi x 1.333 x density of lead in gm/cm^3 (~11)
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Unread postAuthor: Ragnarok » Mon Nov 19, 2007 8:03 pm

It's 11.34 g/cm<sup>3</sup>* IIRC, and also, that would be better done as <sup>4</sup>/<sub>3</sub> rather than 1.333.

* I know a lot of densities off the top of my head.
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 19, 2007 11:45 pm

Ragnarok wrote:It's part of a crane's summat or other, and weighs in at 1.4 kg if I remember right from the last time JSR lamented his lack of a 3" pneumatic.


Correct, though you make it sound like I complain I have nothing to fire it with every week on a regular basis :? :D

DYI, I'll hang on to it for now, the cannon to launch it is still in the works - maybe eventually at a 45 degree angle it will make it across the Atlantic :D
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Unread postAuthor: rna_duelers » Tue Nov 20, 2007 1:18 am

I got a few large Steel bearings,one is stainless and the other is plain steel I'll see how big they are and get a picture up and the race is on jack to see who can get one across there continent first!I think I'm at a bit of a disadvantage though...

The Stainless steel ball is 1.2kg,the larger non stainless ball is just shy of 2.2kg and I got them from my uncle who owns a machining,milling,engineering company Leussink Engineering and he gave these to me when he showed me the company one time when I was younger.Thats the end of that chapter.

Here is there website if you wunna have a read up http://www.leussink.com.au/
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 20, 2007 2:14 am

Blury I Know,and the Turkey bottle was the only size referecne I had at the time.NOT DRUNK!


pull the other one :roll: :D

and I just have to get this one out of the way quickly *sounds of pink napalm coated pachyderms charging* nice pair of balls :roll:
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Unread postAuthor: Novacastrian » Tue Nov 20, 2007 2:20 am

and I just have to get this one out of the way quickly, nice pair of balls :roll:[/quote]

Awwwww :D

Seriously, what size chamber would one need for a 3" ball?
Even better, the size of the "piston" would be remarkable!
:lol:
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Unread postAuthor: Ragnarok » Tue Nov 20, 2007 2:35 am

@JSR: I could see a "balls of steel" joke coming there. I wasn't quite right, but I was damn close.
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 20, 2007 3:19 am

Ragnarok wrote:@JSR: I could see a "balls of steel" joke coming there. I wasn't quite right, but I was damn close.


The humour remains adolescent and is becoming predictable, I need to start moderating myself. At least, props to rna_duelers for not rotating that liquor bottle by 90 degrees to complete the phallic allusion :D
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Unread postAuthor: rna_duelers » Tue Nov 20, 2007 4:21 am

Ohh how easily it can be done :wink: .I won't do it but otherwise you might literally start to feel 14 again...Is that a good thing or. . . .
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