Pro/Forums - Smelting copper

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Thanks 8-ball..thats basically what I was trying to tell him.....Just get a mill to begin with.

Besides , once he makes his first block, theres no way out.....youre hooked!

Quote:

Originally posted by 8-Ball

A WORD OF WARNING!!!!

A student was killed here at Oxford trying to sand cast Aluminium when the mould hadn't been given enough time to dry.

The temperature instantly boiled any remaining moisture in the mould, and as previousl explained, it exploded.

He probably would have only been injured if he hadn't turned and run. A large portion of the molten aluminium was thrown into the air and landed on the back of his neck, running inside his protective clothing.

I need not go into any more detail.

As for being able to make intricate patterns in the block. This will only work if you can control the filling of the mould very accurately. The design of the mould will also take considerably more time than producing a CAD drawing for CNC machining. There are many factors involved in producing a successful mould for casting, and without using very expensive techniques, the results won't be that great. That means you will need a large amount of finishing. This will have to be done on a milling machine. And to be honest, if you're doing that, then you may as well mill the whole thing.

8-ball

Quote:

Originally posted by LiquidRulez
Hell, Id just like to be able to buy a drill press that can do 15,000 RPMs...

You can. It's call a "Dremel with stand". LOL.

Quote:

Originally posted by Rami Saikali
Specific Heat

Copper 0.092
Zinc 0.0915

http://www.lib.umich.edu/dentlib/Den.../Specheat.html

Hummm but apparently it sthermal conductivity is bad... similar specific heat though..

The specific heat capacity is the amount of work (Joules) required to raise a unit temperature of a unit volume of material. Thermal conductivity on the other hand is the heat flux (delta t) measured when an amount of unit heat is passing a unit distance through material a unit area thick. Specific heat capacity will not matter in a waterblock with a state of equilibrium i.e. the final temperature has been reached. Zinc is worse than aluminium at conducting heat.

Hope I didn't make a mistake. :)

Quote:

Originally posted by hara
The specific heat capacity is the amount of work (Joules) required to raise a unit temperature of a unit volume of material. Thermal conductivity on the other hand is the heat flux (delta t) measured when an amount of unit heat is passing a unit distance through material a unit area thick. Specific heat capacity will not matter in a waterblock with a state of equilibrium i.e. the final temperature has been reached. Zinc is worse than aluminium at conducting heat.

Hope I didn't make a mistake. :)

You didnt :D just didnt get my facts straight.

Ask roscal about the casting of copper, I think he is the most experienced. I'm sure you'll give up if you knew what machinery is required. ;)

Hey hara iw as wondering...

Could you possibly just tell me how to get into 3d mode with cad.. i just want to draw up rough things for personal use and i can get out of 2d mode.. the little rosetta doesent stick out like it is in 3d mode.. And i want to know how can i cover an object in a certain color once i have made it...

And finally how do i disable taht auto mov ethign where it wants to move your cursor to the nearest end of a line segment..?

AFter that i should be ready to go to make some pics in cad... just for personal fooling around nothing real involved.

oh yeah and how the HELL do you get your cad screenies soo damn clean!?! when i take a screen paste into paint and save as jpg it looks like crap

I'm no expert in CAD. I learned by experience and that is not a good way to learn things.

Could you possibly just tell me how to get into 3d mode with cad..

As soon as you extrude a 2d region (or insert a 3d object), the modeler is loaded. There are several views (isometric, front, plan).

To apply a material you could use the apply materials box from the render menu (from the view menu). It has copper in the materials library :cool:

>> And finally how do i disable taht auto mov ethign where it wants to move your cursor to the nearest end of a line segment..?

there is a button near the coords at the bottom "snap".

Hope that I was helpful :)

Quote:

Originally posted by Rami Saikali
oh yeah and how the HELL do you get your cad screenies soo damn clean!?! when i take a screen paste into paint and save as jpg it looks like crap

Yeah, it is crap. You could use another program for example photoshop and save the jpg with more quality.

to photoshop it is :)

Thanks a ton man i just needed a fwe questions answered and i heard you know a bit bout CAD