Re: [ATM] Polishing / Figuring Simulator

["Donald Good" <donald.good@comcast.net>]

Richard,

There is a pressure distribution.  As the component-on-top (COT) overhangs
the component-on-bottom (COB), the edge of the COB acts as a fulcrum with
the weight of the overhanging part of the COT causing a lifting effect on
the non-overhanging part of the COT.  The pressure near the edge of the COB
increases and the pressure under the remaining non-overhanging part of the
COT outside the pressure increase zone, decreases.  This is a continuous,
but non-linear change function.  This will continue until all the weight of
the COT is concentrated near the edge of the COB when the center of the COT
is near the edge of the COB.  A little more and the COT will up-end and fall
off.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Richard
Sent: Sunday, May 07, 2006 5:14 PM
To: Martin Cibulski
Cc: atm@atmlist.net
Subject: Re: [ATM] Polishing / Figuring Simulator

Hi Martin,

Sunday, May 7, 2006, 9:52:02 PM, you wrote:

MC> Tool overhang cannot be simulated. Perhaps someone else has an idea 
MC> to calculate the pressure distribution in this case.

The downward force doesn't change so you just need to calculate the
instantaneous overlap area and calculate pressure from F/A.
Not sure what you mean by pressure distribution - if it isn't even over the
full contact area then the tool isn't rigid enough.

I'm doing a similar job, but have a driven tool and am calculating a tool
RPM profile and tool position profile based on the difference between the
wanted mirror profile and the known current profile.

-- 

Best regards,
  Richard in the UK

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

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