Re: [ATM] lap plowing

[hermit <hermit@outofoptions.org>]

Chuck Meaney wrote:

>Can you help me someone?
>
>I am figuring a 6" mirror with the lap on top to
>reduce a central hole- and while using a 1/3rd stroke
>after cold pressing for 1 hr, you can even feel the
>lap plowing into the edge of the mirror. The focault
>results have been a slight turning at the extreme
>edge.  Lost the diffraction all the way around the
>mirror, and now very bright on right.  The lap is
>trimmed well, and conforms to the shape of the mirror.
>What am I doing wrong?
>
>  
>

Kind of hard to do on a 6 inch mirror, but try and keep the weight in 
the center.  If you are walking the barrel, change position with every 
stroke and push with the palm of your hand at the center of the lap away 
from you.  It is easier to do than pulling it.  You may end up with a 
few more miles walked, but it should help with the edge.

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