2009/6/11 Douglas Pollard <[email protected]>:

> We did some experiments and what we decided was
> that fingers must be the most accurate thing on earth.   It some point
> the writing gets pretty feeble looking but is still ledgeable.   One of
> the engineers did a write up on this off the wall project for s

Funny you should say that, when making the ultra-thin glass specimens
they had to be mounted in epoxy, held in a bit of 3mm brass tube (the
sort of stuff that modelmakers use) sliced into 0.25mm discs. I was
paranoid that if I muddled up the specimens I had no way to tell which
was which, so found that I could relatively easily write reference
numbers in the wall thickness of the brass tube without too much
difficulty, as long as you used a microscope.

Just goes to show that accurate optical feedback will make up for any
amount of play and elasticity in the control system.

-- 
atp

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