Re: Polishing Compounds

Bob Luffel (bobl@gr.hp.com)
Wed, 29 Mar 95 10:47:20 MST

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>
> The common wisdom is that polishing with the lap on top is a guaranteed
> way to generate a turned edge. I am always very careful to keep my strokes
> short and use good pressure centered over the mirror. I have been
> able to turn the edge of the mirror up doing this on occasion.
>
> Polishing with the lap on top is one of my ways to reduce the ever popular
> fatal hyperboloid. But, whatever works for you is what you should do :)
>
> Mark VandeWettering
>

I just completed my 10" along with lots of help/advice from Jerry Wilkinson (has figured over 1500 mirrors for Galaxy Optics) and he had me do tool on top to -Cure- a slight turned edge. It worked (he stated that he only uses tool on top to cure a turned edge). Definitely the strokes must be kept to 1/3 or slightly shorter. Also, as always, the lap MUST be in good contact (I have learned this the hard way).

Bob

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