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New Asian copy of the ETA 7750 |
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Articles -
Watchmasters Corner
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Written by Ziggy Zumba
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Page 4 of 7
Banking pins (where the pallet arm sits), much better quality than the old 7750’s…
This is the dial side, just below the new plate for the transfer gears, this is where the minute wheel, cannon wheel sit (minute wheel goes in the large space on the left)
Various shots of the assembly, here is the balance in place and the basic movement assembled.
This is the click wheel (clutch for the auto-winder rotor), note that it’s a spring ratchet and is not prone to hand-winding problems as the click wheels with the arms are (2836-2 series).
The big brass wheel is the chrono center seconds wheel, and the arm below it is the transfer gear taking running seconds from the 2nd wheel and moving it up to the chrono. On this one again we have brass on steel, so there is no wear issues…
This is the bottom chrono reset lever assembly with the reset arm, brake lever, and pusher piece. This spring is very difficult to install. All this is for the 12 hour counter.
Overall view so you can see the relationship of the various parts…
Here is the 11 new gears in place before the last bridge is installed, just so you can see how complex this addition is to the basic movement…
Here’s another big surprise, this arrow is the 30 minute timer centering spring eccentric screw adjustment, it’s actually a screw and can be adjusted. On the previous versions, it’s a backwards screw and is not adjustable. When I see attention to these fine details, it convinces me that someone put some real effort and thought into getting this one right.
Now the post you see here is the centre post for the chrono seconds wheel. If you never took notice, every gear in the movement is brass on steel, there is a good reason for this, and it all comes down to friction. On the ETA 7750, this tube is steel, but on this one, someone decided it was better to have it in brass.
Even more amazing, is that they installed a jewel on the other end where the shaft comes out and the seconds hand attaches. Now this is impressive, ETA does not do this, but someone has made every effort to reduce friction, and increase the life of the movement.
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Last Updated ( Tuesday, 14 August 2007 )
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Articles 
