Re: [ATM] flat query

["Thomas Janstrom" <tomjan@ozemail.com.au>]

OK, with respect to B+C, try to decentre the rings such that the
remaining segments of arc appear line like, the easiest way to do this
is to apply some pressure to the edge of the two flats while they are in
contact. You will see the line zoom of to one side, when you have about
5-10 fringes (the lower number is better) take a straight edge and lay
it over the center of the flat, such that you find the "mean" straight
path that crosses the fewest fringes. Count how many the edge crosses,
this is the number to use.

For the plus or minus value move your head to or from the flats and see
which way the fringes move, if you're using ATM Vol 1 by Ingals then he
explains which way they should move if the surface is concave. I don't
recall of the top of my head what should happen, sorry.

The sad part is I should, I'm working on the same thing at present.....

Clear Skies, Thomas.
www.tjanstrom.com
www.norsewines.com.au 



-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf
Of shyam rathod
Sent: Friday, 30 December 2005 2:09 PM
To: atm@atmlist.net
Subject: [ATM] flat query

dear list

 was under the process of producing 4"flat  i have some problrm with
these
  A+B= -9(concave
rings)-----------------------------------------------------------------1
  B+C=-5(concave rings)and +3 (convex rings) like 5 rings inside are---2
behaving like concave and outside 3 rings behave as convex thus when i
put pressure on the bullseye the ineer rings travel inside while outer 3
rings travel outside.
  C+A=
-11(concave)------------------------------------------------------------
-----------3
   
  thus i am confused with equation 2 what do i consider it as -5+3 ?????
  if i consider it -5+3 then i get A=-9(4.5 wave concave), B=0(0wave),
C=-2(1wave concave)
   
  thus B according to above assumtion is perfect flat that i dought
   
  another problem while lapping(polishing) i am not able to change the
situation after much of polishing i still see the same number of rings
on A+B=-9 so i am not able to make A flat even after considerable amount
of time what do i do?
  do i use a hard lap while now iam using pure coal tar i am not mixing
rosin sould i paint the existing lap with rosin so that it is hard and
then cold press?
   
  will hard lap do fast polishing? 
   
  is it that if we mix more water in cerium oxide while polishing it
polishes slow should it be a thick paste for fast polishing?
   
  what is the effect of adding soap to the water and cerium oxide what
does less amount of soap or greater amount of soap do to the polishing
...does polishing become slow or fast with addition of soap.
   
  what is effect of addtion of inert agent like sugar to the polishing
liquid what does it do (as i have read in ingalls that adding sugar
increases density but what is effect on rate of polishing)
   
  shyam rathod(india)
   
   
   
   
   


		
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