Re: ATM 10" help - TDE?

["Ken Hunter" <kb7h@onemain.com>]

Tyrone

FYI

When you swap the TOT and MOT, be aware that the time you
do TOT will be much longer than with the MOT. With TOT, you
are working the outer zones of the mirror with the center of the tool.

There is a LOT more area in the outer zones than in the center of
the blank. A 50/50 TOT/MOT exchange will not keep the ROC
the same as the center of the mirror works faster with MOT due to
the smaller area being worked.

For working the edge, Work TOT, stroke from the center of the
mirror taking the tool center almost to the edge and imagine that
you are pushing glass from the middle zones out to the edge of the
mirror. (Do not push the glass OVER THE EDGE!)

Return the tool to the center (without pressure), repeat the stroke
then rotate the tool and step sideways. Repeat the whole process
until you've made a couple trips around the mirror.

Clean and dry the mirror blank, set it on the tester and go have a
cold drink while the glass temp stabilizes.

Measure the surface and estimate the number of times you need to
repeat the above process and do HALF that number of sessions.

Test again and estimate the remaining sessions. If you do HALF
each time you will not overshoot the desired ROC. If you find the
glass getting ZONEY, you can do short sessions of COC and "W"
strokes to blend in the surface always remembering there is more
area at the edge and you will need to work longer there to maintain
or obtain the desired edge.

Ken Hunter



----- Original Message -----
From: "Tyrone Steele" <atm@pivotmusic.com>
To: "ATM" <atm@shore.net>
Sent: Wednesday, September 25, 2002 10:18 PM
Subject: Re: ATM 10" help - TDE?


>
> Well, last I just picked back up on this mirror recently, after 9
months of
> taking a vacation from it. It seems to me I endevoured about 15
hours
> polishing, 5 or 6 of which was just trying to get that edge to
polish out.
> Some photos were out, some inside the ROC, some right at the ROC.
> I did swap between TOT and MOT the whole time.
> The entire mirror is polished out except for that edge which just
won't come
> out. That's why I put it down way back when, and waited 9 months. I
was just
> frustrated with it.
> I will try te Tool-On-Top only with 1/3 W strokes, as everyone is
> suggesting.
> It probably was air currents. It was a hot day and there is no AC in
that
> room. Needed a fan.
> Thanks for the help.
>
>
>
>
> ----- Original Message -----
> From: "John D. Upton" <jd-upton@texas.net>
> To: "Tyrone Steele" <atm@pivotmusic.com>
> Cc: "ATM List" <atm@shore.net>
> Sent: Wednesday, September 25, 2002 11:41 AM
> Subject: Re: ATM 10" help - TDE?
>
>
> > 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"
>
>