an interesting material was Re: Hardinge Conversions

Hello,

A material we've talked a fair bit about on othwer lists is ZA12 and
ZA28.(Zinc aluminum; NOT Zamak) It is strong(nearly as strong as CI,
AIRC), tough, and a bearing material. Casts at 950°. Try the
hobbicast yahoo group for more info.

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., "Marcus & Eva" <implmex@a...> wrote:
> Hi Dave:
> Your comments on bronze caught my attention.
> I've used Aluminum bronze on injection mold slide rails and wear
plates.
> It wears very well and won't pick up, but it's the devil's own to
try to
> machine accurately.
> It warps all over the place, and doesn't surface grind worth a damn.
> I always had the best success bolting the plates into position and
then
> flycutting them to final size.
> I can just imagine the stresses imposed by these parts if they were
part of
> a machine slide.
> Linear bearings are the way to go.
> Cheers
>
> Marcus
> -----Original Message-----
> From: dave engvall <dengvall@e...>
> To: CAD_CAM_EDM_DRO@y... <CAD_CAM_EDM_DRO@y...>
> Date: Friday, April 20, 2001 9:01 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Hardinge Conversions
>
>
> >Joe and list,
> >Since advice is cheap....
> >
> >Making the bulk parts out of hardened steel is
> >overkill. Only when you bump up against the yield
> >point does all that strength do any good.
> >If I were to try to do something fancy...really
> >fancy I would cast (iron) the big parts. Actual
> >slide contact parts would be something like A10 or
> >O6 ( because of the spherodized carbon content)
> >hardened and ground.
> >
> >I would stay away from cold drawn because of the
> >stresses caused by drawing.
> >
> >I often think about bronze for one side of slides
> >but that may not be practical as you don't see it
> >on commercial gear.
> >
> >It is easy to dream when one is not responsible
> >for the construction.
> >
> >Good Luck,
> >
> >Dave