Re: [CAD_CAM_EDM_DRO] Epoxy Granite

*In either case Good luck with the project. I do think that linear motors
would be a good move the mechanical's of ballscrews make for more problems.
*

**

*Harko*

On 2/23/06, Jack Hudler <yahoo@...> wrote:
>
> Harko,
> Because the mirror is so thin 1.75"; I'm turning it in its mirror
> cell.
> This cell is a functional part of the telescope on which the mirror is
> attached
> axially to 36 actuators pads and radially at the 300 mm hole cored in the
> center. The actuators are then used to flex the mirror to
> compensate for
> gravity/figure/thermal/whatever errors in the finished mirror and not used
> during turning. Though I suppose if I ran into some weird zonal defect
> while
> polishing I could tweak it out by adjusting an actuator or two ;).
>
> Before I make a decision one way or the other I'm going to part
> this all
> up in Autodesk Inventor 10 and do some FEA then rotate it 90 degrees and
> see
> what happens.
> Besides I got a half dozen 16 inch and a couple of 24 inch blanks
> I'm
> going to torture first. Then flatten the one face of the 2 meter disk,
> flip it
> over and inverse parabolize the back side (this is for thermal/stress
> equilibrium in the finished mirror) and core it. LOL... Figure it will
> take me a
> year to get up the guts to put a cutter to it.
>
> Jack Hudler
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:
> CAD_CAM_EDM_DRO@yahoogroups.com]
> On Behalf Of Harko Schwartz
> Sent: Thursday, February 23, 2006 8:03 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Epoxy Granite
>
> I think that you would be better off in a Vtl type of lathe for stability
> of
> the mirror.
>
>
> Harko
>
>
>
>
>
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