Re: [CAD_CAM_EDM_DRO] Re: Surface plates as a base for tooling

As Ballendo has pointed out thee are anumber of good reasons to go with
a high mass and stiff substrate. Even then mass and stiffness may not
be enough depending on what you are trying to accomplish. I've worked
on machines where just tapping the granite base would impact surface
finish quality. Now that doesn't mean that aluminum can't be used to
build a lathe but it may be much harder to keep that lathe from
responiding to things you don't want it to respond to.

There is nothing worst than having your surface finish go out of spec
when someone walks buy. Now granted not everyone here i trying to
maintain surface features to the micron level, but on the other hand it
is not impossible to do. Futher if you really want to it can be done
with in a limited budget. Such tolerances often come down to the
craftsmanship of the builder, in knowing how to install his encoder or
feed back devices and tune his machine. A machine built on a good
foundation makes producing such a a functional lathe that much easier.


Thanks
Dave


ballendo wrote:

>Hello,
>
>How about flatness, stiffness, temperature stability, damping mass...
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>Ballendo
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>P.S. Several recent posts tell how to attach machine parts to Granite.
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>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Ray Brandes" <RBRANDES@G...>
>wrote:
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>>Dave,
>>I wouldn't know how to attach machine components to granite. I am
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>sure
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>>it can be done though. Aside from the stability offered by the
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>weight,
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>>I don't see any advantage over aluminum jig plate.
>>Regards, Ray
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>>
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