[ATM] Help with Mirror

[jsgrmfg at gracemfg.com (jsgrmfg@gracemfg.com)]

Hi Robert,

    What you have drawn is a nice, spherical mirror with a strongly
turned UP edge.  That is much better than having a turned down edge.
In fact, a good, smooth sphere with a slightly turned up edge is a good
place to start the long parabolizing strokes.  The TUE is probably the
result of using short strokes to cure a TDE and return to a sphere.
Lengthening the strokes a bit and/or using a wider W stroke for a while
should lengthen the radius of that edge zone and get you back to a good
place for parabolizing.

    Good luck.

Jim Sturtevant





"Robert Turner" <rbturner@charter.net>@atmlist.net on 01/28/2004 08:54:28
AM

Please respond to The Amateur Telescope Makers List <atm@atmlist.net>

Sent by:    atm-bounces@atmlist.net


To:    "The Amateur Telescope Makers List" <atm@atmlist.net>
cc:

Subject:    RE: [ATM] Help with Mirror

Ok I guess I need to make a link to the image...

http://webpages.charter.net/astrorob/mirror_focault.jpg

Thanks Robert

> -----Original Message-----
> From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net]On Behalf
> Of Robert Turner
> Sent: Wednesday, January 28, 2004 8:48 AM
> To: ATMList Post
> Subject: [ATM] Help with Mirror
>
>
> Hi,
>
> I am still at my first mirror. I am trying to get it back to a
> sphere after
> getting a TDE while figuring. I am looking for some help on interpretting
> the focault shadows that I am seeing now. I have attached a drawing of
the
> shadows. The KE is moving in from the right. The knife is at the
> ROC of the
> mirror.
>
> Thanks for the help
>
> Robert
>

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