[ATM] 16 1/2" mirror grinding-NEED HELP

[horace r davis]

appreciate input on type of strokes to get the desired f5 focal length
    center depth .200
    Telescope mirror log 16.5 inch mirror
    Started Jan 2007
    Tool: 5 inch diameter pipe phalange
    Beveled edge 1 hr
    Hogging out mirror
    2 hr first light center under straight edge
    4 hr not using enough grit less .05
    3 hr increased grit center depth .069
    1 hr center depth .076
    10 hr
    1 hr center depth .089
    1 hr center depth .106
    1.5 hr center depth .120
    Center 2/3 of mirror was hogged out buy the other 1/3 not touched
    Increased length of stroke to reach the edge
    2 hr center depth .149
    1 lb * 60 grit used at this time
    17 Jan 15.5 hr
 
    Thank you,
    Bob Davis