[ATM] Re: [atm_free] Sleekfest 2004

[wa4guu at verizon.net (Jerry)]

	Sleeks look like the finest strand of spider web and most will be
fairly short, about 1/4 to 3/4 inch or so. Some might be longer.

	It takes a quite bad scratch to be seen in the Foucault test. I
would say that any scratch you can see in the Foucault test will require
going back to grinding to remove unless you have a lot of spare time. If you
can see it in the Foucault test it is probably so deep that what allows you
to see it is the edges on each side of the scratch turning down from
polishing just as the edge of the disk turns down. Yes, the edges of a
scratch or the perimeter of a bubble can do that. Sleeks can't be seen in
the Faucault test and can be hard to see at all.

	I look for sleeks with the unaided eye up close, a foot and a half
or so away in a dark room, with a flashlight shining across the surface from
the side. If the glass is clear having black cardboard behind the mirror
helps. You will have to play with the lighting angle. Once you see them
remember the setup. If you see any you will probably see thousands.

	Now of course sleeks are a type of scratches. But they are too
easily gotten rid of to hang that awful name "scratch" on them.

	To clarify an earlier post of mine the idea is to "hunt" for the
"conditions" that allow you to maintain a smooth motion stroke with friction
rather than a smooth motion stroke that is friction-less. Pushing the glass
or lap should be more like pushing the piston on an auto shock absorber than
like pushing a puck on an air-hockey table.

	I have had sleeks and got rid of them using the same lap without
changing polishing agent or processing it in any way to make it different
than it was when the sleeks were made.




Jerry