Following a photrio conversation with members Ian Grant and Digital Wendy I took on the task of restoring iris operation to the
6 3/8" Taylor Hobson Cooke Anastigmat mentioned in this post :-
The Lens initially took a little convincing but came out of the board with little fuss.
The iris leaves were just visible inside so applying any force to attempt movement could easily damage leaves/pins. Complete disassembly being the only option.
Initially all looked good
On removal it became apparent one pin had parted company with its leaf.
With leaves and glass removed it was possible to attempt movement of the iris ring -
But Nothing worked, many options were tried with oil, acetone, heat, cold etc. etc..
to the point I was fearing damaging the main body metalwork. Having many years experience of getting things undone I decided other options were required. Short of turning off the iris ring, which I concluded was aluminium to aluminium thread that had seized due to corrosion/galling, and manufacturing a replacement, there were few options left.
I suggested adding and additional slot through the iris ring to access the slotted drive ring.
6 3/8" Taylor Hobson Cooke Anastigmat mentioned in this post :-
Replacing shutter blinds (and probably more) on a Thornton Pickard Ruby Deluxe 1/4 plate
I'm feeling a bit lost in this restoration today. There are lots of resources here but I lose track of the threads. Could an experienced forum user direct me to a current post with live links please? (sorry to sound whiney) My Thornton Pickard Ruby Deluxe (Quarter plate) is back in pieces for...
The Lens initially took a little convincing but came out of the board with little fuss.
The iris leaves were just visible inside so applying any force to attempt movement could easily damage leaves/pins. Complete disassembly being the only option.
Initially all looked good
On removal it became apparent one pin had parted company with its leaf.
With leaves and glass removed it was possible to attempt movement of the iris ring -
But Nothing worked, many options were tried with oil, acetone, heat, cold etc. etc..
to the point I was fearing damaging the main body metalwork. Having many years experience of getting things undone I decided other options were required. Short of turning off the iris ring, which I concluded was aluminium to aluminium thread that had seized due to corrosion/galling, and manufacturing a replacement, there were few options left.
I suggested adding and additional slot through the iris ring to access the slotted drive ring.