Re: ATM 10" help - TDE?

["John D. Upton" <jd-upton@texas.net>]

Tyrone,

At 08:20 AM 9/25/2002 -0500, Tyrone Steele wrote:
>Is this TDE or TUE?
...snip...
>I noticed the edges, while polishing, will not come clear by about 1" all
>around it.

     Assuming the mirror were polished, if the photos were taken outside 
the ROC, then this is turned down / rolled edge.  If they were taken closer 
to the mirror, then they are turned up edge.

     How much time do you have in polishing already?  Have you been 
swapping Tool-On-Top and Mirror-On-Top every wet or two?  You need to get 
the edge polished out before you can call it a true TDE.  Until the mirror 
is polished, it is just a lagging edge polish.

>What is the best way to fix this problem?

     If you are not yet polished out, just try Tool-On-Top only with 1/3 W 
strokes for a long while to see if it starts to respond.  The edge is 
lagging behind the center and may just need more action.

>For the ROC = 0 photos (no lines) are those imperfections there?

     That is either dog biscuit or air turbulence.  While you are polishing 
the mirror, don't worry about it.  Once the mirror is fully polished and 
ready to start figuring, then you can adjust your technique so that the 
surface is smoother.  Watch for air currents in the room while testing also.

Sincerely,

John D. Upton
Georgetown, TX
<http://www.atm-workshop.com/>      "The ATM's Workshop Page"
<http://hometown.aol.com/RonWin20/>  "Ronchi For Windows Software Page"