Re: [CAD_CAM_EDM_DRO]
Posted by
Smoke
on 2001-01-18 18:08:25 UTC
hahahahaha! Obviously!
Just about any "flat" surface you build will deform under its own
weight...even those ones you and everyone else is talking about.
if you want a truly flat one then build a HEAVY ribbed base with the top
surface blanchard ground. Mount it on a set of I beams imbedded in 12" (or
more) of concrete. Make sure the concrete is well reinforced and is poured
on undisturbed soil that has been well packed. That's the way the auto
industry builds and installs all their tranfer machines. I should know...I
worked in that industry for a lot of years!
Better yet drive some piers down to bedrock and weld the I beams to those
before pouring the cement.
If you design the ribbed table I mentioned properly, you'd have a "cored"
or a "honeycomb" casting.
Smoke
Just about any "flat" surface you build will deform under its own
weight...even those ones you and everyone else is talking about.
if you want a truly flat one then build a HEAVY ribbed base with the top
surface blanchard ground. Mount it on a set of I beams imbedded in 12" (or
more) of concrete. Make sure the concrete is well reinforced and is poured
on undisturbed soil that has been well packed. That's the way the auto
industry builds and installs all their tranfer machines. I should know...I
worked in that industry for a lot of years!
Better yet drive some piers down to bedrock and weld the I beams to those
before pouring the cement.
If you design the ribbed table I mentioned properly, you'd have a "cored"
or a "honeycomb" casting.
Smoke
>You're right, of course. A cast ribbed table can be made quite flat.
>Unfortunately it isn't very stiff, and will deform under its own weight.
>One step up from simple ribs is a cored casting, with minimum open space on
>the back. Better than that is the honeycomb, if you can make it.