minutes. Then give it a stir and pour ingots. Then use this to cast your
parts. I think 5% is about the right amount.
On Sun, Feb 27, 2011 at 5:02 PM, David Patterson <odd_kins@yahoo.com> wrote:
>
>
> If you use extruded aluminum you'll loose the hardness that the extrusion
> has. To get some of this back you'll need to remove the casting while still
> hot. then quench in cold water, well away from the furnace. Or you'll need
> to heat treat the casting.
>
> Dave Patterson
> odd_kins@yahoo.com
> http://home.comcast.net/~oddkins/foundry_home.html
>
> --- On Sun, 2/27/11, james <james122964@yahoo.com> wrote:
>
> From: james <james122964@yahoo.com>
> Subject: [gingery_machines] Re: New Here
> To: gingery_machines@yahoogroups.com
> Date: Sunday, February 27, 2011, 4:57 PM
>
>
>
>
> So, it would be better to use the extruded aluminum? or should I hunt
> around for actual cast aluminum?
>
> I sure wish the die cast stuff would have been worth it, as it melts a lot
> easier and is heavier, guess I could use it for pulleys.
>
> Jim
>
> --- In gingery_machines@yahoogroups.com, David Frantz <websterindustro@...>
> wrote:
> >
> > Long ago I worked in the die cast industry so I have some experience with
> this. First die cast alloys are not the same as zinc based casting alloys
> designed for sand casting. Second die cast alloys age significantly of time.
> Third die cast alloys are sensitive to the ratios of metals which means it
> is easy to get fining results if the alloy varies from the accepted ratios
> much.
> >
> > Given that you wouldn't have any problems pouring a Zinc die cast alloy.
> The low melting points mean that you can get by with a cheaper furnace.
> Sources for the alloys where at one time cheap and plentiful (carburetor and
> other auto parts). Zinc die castings can have initial strengths equal to
> similar cast iron parts. So there are good points to consider with respect
> to Zinc castings.
> >
> > The bad points are also worth considering. One in this context is that a
> Zinc casting might not be as dead as a cast-iron or aluminum one. That is
> you may see much more in the way of ringing and vibration transmission. As
> mentioned above the alloys do age over time which might result in a need to
> re scrape parts overtime. Actually all cast metals have an aging factor it
> is just that some Zinc alloys can age more than others, plus this is in the
> context of die casting.
> >
> > In the end I would NOT recommend zinc die cast alloys for most parts of a
> lathe. I just think you would get far better results from other materials
> for most of the structure.
> >
> >
> > On the granite:
> >
> > Granite counter top material can pass as A surface plate. You should
> check the flatness your self and make sure it is well supported to prevent
> bending under use. Simply due to the thickness it ought to be a better
> starting point for a surface plate than ceramic tile or other things that
> are often suggested. In any event realize that a surface plate requires
> maintenance just like every other tool.
> >
> >
> >
> > David A Frantz
> > websterindustro4at4mac.com
> >
>
> [Non-text portions of this message have been removed]
>
>
>
[Non-text portions of this message have been removed]
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