I need a smallish very dense weight for counter balancing something.

I have a finished product price, £60.

Is that barking? Can I get it supplied and machined for less?

--
Adrian C

On 13/01/2016 17:45, Adrian Caspersz wrote:
I need a smallish very dense weight for counter balancing something.

I have a finished product price, £60.

Is that barking? Can I get it supplied and machined for less?

ISTR there are several tungsten alloys of different densities available
for weights. 100 grams of "tungsten" darts would be cheaper than this.

I suspect that depleted uranium might be cheaper; if you can get hold of it!

On 13/01/16 17:50, newshound wrote:
On 13/01/2016 17:45, Adrian Caspersz wrote:
I need a smallish very dense weight for counter balancing something.

I have a finished product price, £60.

Is that barking? Can I get it supplied and machined for less?

ISTR there are several tungsten alloys of different densities available
for weights. 100 grams of "tungsten" darts would be cheaper than this.

I suspect that depleted uranium might be cheaper; if you can get hold of
it!
MMm. What are fishing weights made3 on now? You might be able to cast
them in resin and grind the thing down to the exact weight.


--
Karl Marx said religion is the opium of the people.
But Marxism is the crack cocaine.

On 13/01/16 17:45, Adrian Caspersz wrote:
I need a smallish very dense weight for counter balancing something.

I have a finished product price, £60.

Is that barking? Can I get it supplied and machined for less?


Does it really need to be W? Would lead do - just over half the density,
so cube root of 2 times the size in each direction.

On 13/01/16 18:00, The Natural Philosopher wrote:
On 13/01/16 17:50, newshound wrote:
On 13/01/2016 17:45, Adrian Caspersz wrote:
I need a smallish very dense weight for counter balancing something.

I have a finished product price, £60.

Is that barking? Can I get it supplied and machined for less?

ISTR there are several tungsten alloys of different densities available
for weights. 100 grams of "tungsten" darts would be cheaper than this.

I suspect that depleted uranium might be cheaper; if you can get hold of
it!
MMm. What are fishing weights made3 on now? You might be able to cast
them in resin and grind the thing down to the exact weight.



https://www.tackleuk.co.uk/Shop/Carp...Fagewwoda_0AFA

30p per weight appx, and .8 grams so around 18 quid for 100g rectangular
so would stack inside a machined container or resin casting


--
Future generations will wonder in bemused amazement that the early
twenty-first centurys developed world went into hysterical panic over a
globally average temperature increase of a few tenths of a degree, and,
on the basis of gross exaggerations of highly uncertain computer
projections combined into implausible chains of inference, proceeded to
contemplate a rollback of the industrial age.

Richard Lindzen

On 13/01/16 18:08, Tim Watts wrote:
On 13/01/16 17:45, Adrian Caspersz wrote:
I need a smallish very dense weight for counter balancing something.

I have a finished product price, £60.

Is that barking? Can I get it supplied and machined for less?


Does it really need to be W? Would lead do - just over half the density,
so cube root of 2 times the size in each direction.

And lead is easy to cast.

--
Future generations will wonder in bemused amazement that the early
twenty-first centurys developed world went into hysterical panic over a
globally average temperature increase of a few tenths of a degree, and,
on the basis of gross exaggerations of highly uncertain computer
projections combined into implausible chains of inference, proceeded to
contemplate a rollback of the industrial age.

Richard Lindzen

On Wed, 13 Jan 2016 17:45:13 +0000, Adrian Caspersz wrote:

I need a smallish very dense weight for counter balancing something.
I have a finished product price, £60.
Is that barking? Can I get it supplied and machined for less?

As a guide:
1/4 lb. of tungsten powder in 5-7.5 micron is US $23 he

http://www.golfworks.com/product.asp_Q_pn_E_HDTP


Thomas Prufer

On 13/01/16 18:17, Thomas Prufer wrote:
On Wed, 13 Jan 2016 17:45:13 +0000, Adrian Caspersz wrote:

I need a smallish very dense weight for counter balancing something.
I have a finished product price, £60.
Is that barking? Can I get it supplied and machined for less?

As a guide:
1/4 lb. of tungsten powder in 5-7.5 micron is US $23 he

http://www.golfworks.com/product.asp_Q_pn_E_HDTP


Thomas Prufer

here is interesting

http://www.strategicmetals.co.uk/


--
"What do you think about Gay Marriage?"
"I don't."
"Don't what?"
"Think about Gay Marriage."

On 13/01/16 17:45, Adrian Caspersz wrote:
I need a smallish very dense weight for counter balancing something.

I have a finished product price, £60.

Is that barking? Can I get it supplied and machined for less?


Depends.

Eg, for just the machining, in lots of about 10, excluding the cost of
the bar, you could probably get some not-fool here to cut a 20mm pure
tungsten bar into 20mm lengths, drill and tap, finish nicely, for about
£15-20 per. Machining pure tungsten is a sore-headed bitch.

That would probably drop to about £8 per if a machinable tungsten heavy
alloy, density ~ 17.5g/cc, was used instead of pure tungsten.



Of course that does not include the cost of the bar - which is highly
variable in small lots, probably about £8-40 per.




Another possibility is casting tungsten powder in epoxy or similar.
Tungsten powder is readily available at about £7-8 per 100g, epoxy is
cheap, casting is easy - though the density will be only about 13g/cc
max, and probably less.


A third possibility is sintered tungsten powder alloy, cast/sintered in
shape. Mix W powder with a fine nickel braze powder like nicrobraz 30,
ram into moulds, induction heat. Very strong, density up to about 16 g/cc.



-- Peter Fairbrother

On 13/01/16 23:39, Peter Fairbrother wrote:
On 13/01/16 17:45, Adrian Caspersz wrote:


Another possibility is casting tungsten powder in epoxy or similar.
Tungsten powder is readily available at about £7-8 per 100g, epoxy is
cheap, casting is easy - though the density will be only about 13g/cc
max, and probably less.


Thanks Peter and all,

Casting tungsten it is then :-)

Hmmm...


http://www.ebay.com/itm/EAR-WEIGHT-T...-/401048463563

(Poor Dogs!)

--
Adrian C