polsim - using a smaller tool

In the past, I used to have the tool glass the same size as the mirror glass. This time, I like to experiment with a smaller tool, ie, 80% size

mirror size: 406 mm
tool size: 330 mm

Simulation with tool on top

setup:

pause after simulation time of 60

the stroke length refers to tool (on top) travelling across the mirror.

135mm stroke: ( equivalent to 1/3 CoC )

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If the stroke is longer, eg, 155mm stroke: center is deeper

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175mm stroke: almost flat center, then steeper slope on edge

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195mm stroke: steeper wall is ground down

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if stroke is shorter than 1/3 CoC , eg:

115mm stroke: center hill

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95mm stroke; higher and wider center hill

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75mm stroke; even higher center hill. edge region is barely ground away

Martin Cibulski

grattavetro

Astrosurf 

Physicsforum 

Design calculation on polishing machine
IOPScience

Preston's equation:

Tanuja