Re: [ATM] A bit of hand polishing advice please................

[Mark Holm <mdholm@telerama.com>]

John and Bernadine Murray wrote:
> I
> think a touch of tde is coming in. A slightly shorter stroke called for
> perhaps?

Looks like TDE to me.  I use the old mental dodge of thinking of the
light crossing the mirror at a grazing angle from the source side to the
knife edge side.  It helps decide the "sense" or slope of the shadows,
up or down.

I am no expert at preventing or fixing TDE, but I am somewhat soured on
short strokes.  In my bit of experience, they tend to make things worse.
 I'd try for good lap contact out to the edge as close as possible
without getting a ridge of pitch past the edge, then use longer strokes.
 Not radically longer, but enough to make sure the edge really is
getting action.

Probably best to wait for others to chime in.  Like I said, I am no TDE
expert!

-- 
Mark Holm
mdholm@telerama.com

_______________________________________________
ATM mailing list http://www.atmlist.net/