8 replies to this topic

[r.burgy]

Ive already ball milled my bp.which method is preferred for making lift? i have access to a press,and a sifter.
Is there a better method.about what size mesh for lift?

[skipjack]

corned BP has a few advantages compared to riced BP...

- the BP gains efficiecy
- the single grains are sturdier
- no need for a binder, as the press is able to form a rockhard puck by the pressure itself

only downside is that its a little more work but in my opinion its sure worth it.

the meshsize for the lift depends on the shell you want to lift - the heavier the shell, the larger the grains.

[karlfoxman]

I and one other person have found probllems lifting larger/heavier shells with riced bp charges. The problem occurs on ignition, where the strength of the grains is not enough. The granules get blasted to a fine powder and creating an unwanted ammount of power, we have blown the bottom out of a 4inch mortar lifting a 4inch cylinder shell weighing 600g. At some point we shall be making a press, if anyone has an unwanted bottle jack please pm me. Riced grains are fine for lifting smaller 3 inch spherical shells we have found.

Karl

[r.burgy]

after you have riced bp. can you remoisten and press it,or is that not wise?

[BigG]

after you have riced bp. can you remoisten and press it,or is that not wise?

every time you use water, you slightly change the balance of your composition - this is simply because some of the chemicals dissolve and carry away with water excess. The more times you go through re-cycling, the more different the composition is. I guess one re-cycling is probably acceptable, but if you want repeatable results, just use the fine staff as BP in fountains or drivers.

[r.burgy]

thank you gentlemen.
r.burgy

[Draco_Americanus]

Any one know a way to estimate when you have 2 tons of force from a bottle jack that's capable of 6 tons? What happens if you use too much pressure?

[The_Djinn]

Not sure how to estimate.. but one of the American Pyro suppliers has a nice little device you place between the jack and whatever and it shows just how much force is being used. Some of the better tool companies may have simular devices.

Mark

[Creepin_pyro]

Here's a link to one on Harolds page:

http://deskmedia.com...tbn/HAROLD1.htm