Re: [ATM] Machine Polishing

["Martti Koskimo" <martti.koskimo@kolumbus.fi>]

There are so many variables influencing the figure.

What is the table rotating speed ? Is the tool rotating 'regularly' with a
bit lower speed than the table ?  So it ought to do indicating that  there
is good contact  tool/mirror.

If you have too soft pitch every tools movement just a little over the  edge
will unavoidable turn the edge down and it emphasize the hole in the middle
of the mirror

How are your machine moving the tool ?  If the tool has very low profile
then it is ok but if the but if the driving pin is very high up the momentum
is unfavourable.

It should not be so very difficult to find adjustments for spherical
polishing so I guess that your pitch is too soft.


Martti Koskimo



----- Original Message ----- 
From: "aneves" <aneves@snowsoft.biz>
To: <atm@atmlist.net>
Sent: Sunday, April 18, 2004 8:07 PM
Subject: [ATM] Machine Polishing


> Hi,
>
> What is the correct way to spherical polish a mirror on a machine with a
sub diameter tool. Every method I try I end up with a hole in the middle!
Could some of your more experienced on machines give me some hints! How do
the pros do it? I am sure they must be able to pull
> a perfect sphere on a machine.
>
> I am doing an 8" with a 6" tool, 2" stroke offset by 2" to the right.
>
> Regards,
>
> Alfredo
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>


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