RE: ATM mirrors

["c f" <quantemlp@hotmail.com>]

Hello,
I am setting up my first mirror, recieved a kit from www.mirrorkits.com, a 
1" x 6" blank and everything to make the mirror.  I have gone through the 80 
grit and 120.  I have 3 pits left that are a little bit bigger than the rest 
and I have dotted them with a sharpie and will grind them out later this 
week.  I also need to make a spherometer to gauge any high/low spots on the 
mirror.  my question is, with the lap, what is the timming of the stroke to 
get a good figure,  once a second, one stroke per 2 seconds?   And you may 
want to check on www.mirrorkits.com, www.newportglass.com for blanks. both 
have blanks larger than 12" at 1" thick.

thanks

charles

>From  Stipe  Vladova  to  Keith  Taylor.
>
>Keith, you  are  right. There  are  a  lots  of  "brains" who  will  tell
>you  wrong  informaces  or  they  just  dont  want  to  tell  anything. I
>was  in  that  situation  with  my  first  mirror  too, I  figured  and
>corrected  my  first  mirror  over  two  years  because  nobody  did  tell
>me  that  too  soft  pitch  and  fast  polishing  strokes  cause  rough
>optical  curve. When  tested  mirror  shows  a  lot  of  hills  and  holes
>and a  lot  of  different  irregularities. My  mirror  looked  more  like
>potato  surface  than  the  smooth  normal  spherical  section. So if  you
>get  into  a  trouble  just  ask  me  for  advise. You  can  trimm  the
>channels  with  an  old  soldering  iron  and  it  is  very
>  successful. -Can  you  help  me? I  cant  get  12  inch dia  1  inch  
>thick
>plate  blank. Croatia  is  a  small  country  and  here  is  no  glass
>thicker  than  10mm.
>
>

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