From: "Martti Koskimo" 
To: 
Reply-To: "Martti Koskimo" 


The rotation speeds of the table and the stroke are not at all critical.
Extremely large dynamic range is usable.

If you are making only Spherical surfaces rotation dominant speeds are
better. This is what the majority of optical industry uses.

If you want to use the machine also for figuring the stroke dominant speed
is necessary.

If the table is rotating too fast it is difficult to get constantly
changing curvature (Aspheric figuring) . Instead there is a tendency to get
step by step changing spherical curvature.

I strongly recommend slowly rotating table. It is better that the speeds
resemble hand working.
Then the machine behaves the same way as in hand figuring.and all classical
hand figuring 'trick's are doable also with machine.

If you use fast revolving table the aspheric figuring strokes are not
'logical' and by no means easy to conceive without computer modeling and
Computer modeling shows that you need CNC machine to effectively figure on
fast revolving table.(Drag polishing is an exception)


Martti Koskimo




----- Original Message -----
From: "Tim Poulsen" 
To: 
Sent: Friday, January 17, 2003 8:06 PM Subject: ATM Mirror making machine question


>
> This is probably a stupid question, so I'm just the guy to ask it. I'm
building
> a Waineo-style grinding machine (based on his article a few years back in
S&T).
> He mentions that I should set the machine to perform one stroke for every
two or
> three revolutions of the platter.
>
> Is that something I can set by adjusting something or is that a design
thing
> that I need to build in somehow? Right now, as I have it built, the
platter
> rotates once for every 2.25 strokes, basically the opposite of what it
should.
>
> What should I change?
>
> Thanks,
> Tim
>
>

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