[TheForge] Re: Fly press question

[Mike Spencer]

Chuck Robinson quoth:

> There supposedly are presses with compound screw pitches and a
> pressure activated compound nut that changes from coarse to fine
> pitch when resistance is met.

Thanks for the enlightenment, Chuck.  I thought they were *all* like
that.  That feature is the one thing that makes a flypress a Very
Clever Device instead of just another useful whatsit. FWIW, see:

    http://home.tallships.ca/mspencer/nut.html

The screw shown there was in a disused architectural ceramics factory
in England and had been used to ram slighty damp clay powder into
a mould.  Apparently this is a much faster and more controlable
process that either slip casting or working with wet clay.  I've heard
the the old TD clay pipes were made this way, too.

I would pay good money to get a press with the dual pitch.  A single
pitch press would have to be a bargain.

- Mike

-- 
Michael Spencer                  Nova Scotia, Canada       .~. 
                                                           /V\ 
mspencer at tallships.ca                                     /( )\
http://home.tallships.ca/mspencer/                        ^^-^^

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