From: "Tom Stokes" 
To: "Tom Stokes" ,
        
Cc: "atm" 
Reply-To: "Tom Stokes" 


Thanks to all that replied. Almost everyone suggested checking for
periodicity. Pulley mathematics came out with an eccentric speed of 25.0000
rpm and a turntable speed of  10.9375 rpm. Not periodic but close.

However what matters is the movement of the lap relative to the mirror.
Drive pin location and length of stroke become variables. I routinely
adjust these while figuring so maybe I'm just hitting some kind of harmonic
condition. That would certainly explain what I've been seeing.

Tom Stokes
http://home.pacbell.net/tstokes


----- Original Message -----
From: "Tom Stokes" 
To: 
Cc: "atm" 
Sent: Monday, February 24, 2003 4:17 PM Subject: ATM CeO causing streaks


>
> I am figuring a 4.25" F6 Pyrex mirror with a (sort of) MOM 20.
> The TT speed is 11 rpm and the eccentric speed is 25 rpm.
> With Foucault, I see many faint streaks emanating from the edge of
> mirror and heading toward the center. They disappear at about
> the 50 percent zone. Sometimes they are curved much like the wake
> of a tool at work. I am thinking that the CeO is causing this since
> it is such an aggressive polishing agent. Anyone else experienced
> this? Should I stop until I get some rouge?
>
> Tom Stokes
> http://home.pacbell.net/tstokes shows my machine working or a 10".
>
>

--- BBBS/NT v4.00 MP